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a-dinosaur-a-day · 5 years ago

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Balaeniceps rex

By Olaf Oliviero Riemer, CC BY-SA 3.0

Etymology: Whale Head

First Described By: Gould, 1850

Classification: Dinosauromorpha, Dinosauriformes, Dracohors, Dinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Coelurosauria, Tyrannoraptora, Maniraptoromorpha, Maniraptoriformes, Maniraptora, Pennaraptora, Paraves, Eumaniraptora, Averaptora, Avialae, Euavialae, Avebrevicauda, Pygostaylia, Ornithothoraces, Euornithes, Ornithuromorpha, Ornithurae, Neornithes, Neognathae, Neoaves, Aequorlitornithes, Ardeae, Aequornithes, Pelecaniformes, Balaenicipitidae

Status: Extant, Vulnerable

Time and Place: Within the last 10,000 years, in the Holocene of the Quaternary

The Shoebill is known from eastern central Africa

Physical Description: There is no other dinosaur quite like the Shoebill. It is one of the most visually distinctive creatures, with traits monstrous and familiar that make it difficult to really understand exactly what you’re looking at. They stand up to 140 centimeters in height, which yes, is the height of a human being on the shorter side. They can even reach 152 centimeters tall - the same height as a 5 foot tall person. They have very long, skinny legs, with giant toes on their feet that are widely splayed out. Their bodies are huge, with short tails and bulky torsos. Their backs are grey, and their belly feathers are white. Their necks are a lighter grey, and there is some dark speckling all over their wings and right beneath their necks. Their heads continue that light grey coloration, and have small tufts of feathers as a crest on the back of the head. Shoebills also happen to feature yellow, unblinking, perfectly circular eyes, which is unsettling at best. They have heavy eyebrows of feathers over their eyes, giving them a look like they’re always glaring at you - which is even more disconcerting considering the giant, wide, scoop-shaped bill that the Shoebill is named for. The bill is orange, and ends in a small hook, just in case you weren’t terrified enough.

By Peter Halasz, CC BY-SA 2.5

Diet: Shoebills feed mainly on fish - especially lungfish, though most large fish are acceptable. Amphibians, young crocodilians, water snakes, rodents, and young waterfowl are also fed upon by these giant terrifying creatures.

By Snowmanradio, CC BY-SA 2.0

Behavior: Shoebills are calculating bastards - they’ll hover around lakesides and swamps with low oxygen in the water, which forces lungfish to come up to breathe - so that the Shoebill can then lean down and scoop them up. They are loners during the hunt, carefully taking each step as they make sure to not sink too far into the mud and weeds where they live. Their lunging after food is hard to miss - their mouths open wide, revealing how huge those bills really are, and giving it a sinister smile. These lunges are usually startling, as the Shoebill is usually still for a very long time before it goes after prey. It is as if a statue had suddenly come to life. This is especially disconcerting when the Shoebill opts for standing on floating vegetation - just casually going down with the current as though they were a giant Jacana. They tend to defend territories for food, at least somewhat, not coming closer than twenty meters to another Shoebill during feeding. They don’t sense their prey with feel, but entirely by sight - making them very unblinking and focused, adding to their strange aura. Shoebills are also usually silent, which just makes their entire aesthetic even more terrifying. When they do dare to make sounds, they make very raucous cries - usually while they fly.

By Petr Simon

Yes, yes they can fly. Shoebills are some of the largest flighted birds today, which does not help. They hold their wings flat, pulling in their necks to their bodies to aid in making their flight more efficient. They have some of the slowest flaps of any bird, at 150 flaps per minute. They fly only a few meters at a time, and usually prefer to glide as much as possible. The farthest any Shoebill as traveled at one time seems to be 20 meters. As such, Shoebills are not very mobile birds, and they usually only move from place to place based on food availability.

By African Parks/Bengweulu Wetlands Photography

Shoebills begin breeding depending on the water levels of their habitat at a given time. They lay their eggs when the rains begin to end and the waters start to recede; as such, the chicks hatch and fledge late in the dry season. They nest alone, though there are possible reports that they may form some breeding colonies in South Sudan. They make nests out of grass in a mound that is three meters wide, usually placed on a small island or on floating vegetation amongst dense papyrus. They lay two eggs that are incubated for a month. The chickare cute, fluffy, and grey, with tiny regular sized bills. They then fledge a little more than three months later and, what’s more, usually only one chick survives. The chicks and parents will make whining and mewing to each other to get attention and beg for food. Sometimes, the young will make hiccups as begging calls. The parents are constantly with the young for the first forty days of rearing, only briefly leaving to get food and water or nest material. As the chicks age, the parents spend more and more time away, but they still bring food regularly. The chicks, after fledging, remain dependent on the parents for food for a few more years. They reach reproductive age at around three to four years. Displays often including mooing and bill clattering, which can be accompanied by the shaking of the head from side to side, which is quite the undertaking for a bird with such a large head. Breeding pairs stay together for the season, and break up when the chicks leave the nest. Shoebills can live up to fifty years, which is aided by the fact that they tend to not have predators after reaching full size.

By Hans Hillewaert, CC BY-SA 3.0

Ecosystem: Shoebills stick to marshes, especially papyrus marshes and those with reeds and cattails. They will also gather around marshy lakesides, especially near Lake Victoria. They go wherever they can find floating vegetation to stand upon, including ricefields. They tend to go where animals such as hippopotamus go, since the hippo can dredge up food that the Shoebill can then feed upon.

By Fritz Geller-Grimm, CC BY-SA 2.5

Other: Shoebills are currently considered vulnerable to extinction, with 5000 to 8000 birds thought to be remaining in the wild (though that may be low and there may be as many as 10,000). The reasons for this decline in population is partially due to habitat loss - the Shoebill is dependent on papyrus swamps and other wetland habitats, which are targeted by drainage schemes and other development activities. Animals being brought across these swamps and trampling their young also majorly contributes to population decline. It is a very unique bird and a very popular one, so luckily there are some conservation efforts ongoing, especially in zoos. Some hunting is also contributing to population loss. Despite these conservation efforts, only once has the Shoebill been successfully bred in captivity.

~ By Meig Dickson

Sources under the Cut

Elliott, A., Garcia, E.F.J. & Boesman, P. (2019). Shoebill (Balaeniceps rex). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Guillet, A (1978). "Distribution and Conservation of the Shoebill (Balaeniceps Rex) in the Southern Sudan". Biological Conservation. 13 (1): 39–50.

Hackett, SJ; Kimball, RT; Reddy, S; Bowie, RC; Braun, EL; Braun, MJ; Chojnowski, JL; Cox, WA; Han, KL; et al. (2008). "A phylogenomic study of birds reveals their evolutionary history". Science. 320 (5884): 1763–8.

Hagey, J. R.; Schteingart, C. D.; Ton-Nu, H.-T. & Hofmann, A. F. (2002). "A novel primary bile acid in the Shoebill stork and herons and its phylogenetic significance". Journal of Lipid Research. 43 (5): 685–90.

Hall, Whitmore (1861). The principal roots and derivatives of the Latin language, with a display of their incorporation into English. London: Longman, Green, Longman & Roberts. p. 153.

Hancock & Kushan, Storks, Ibises and Spoonbills of the World. Princeton University Press (1992),

Houlihan, Patrick F. (1986). The Birds of Ancient Egypt. Wiltshire: Aris & Phillips. p. 26.

Jasson, J.; Nahonyo, Cuthbert; Lee, Woo; Msuya, Charles (March 2013). "Observations on nesting of shoebill Balaeniceps rex and wattled crane Bugeranus carunculatus in Malagarasi wetlands, western Tanzania". African Journal of Ecology. 51 (1): 184–187.

Mayr, Gerald (2003). "The phylogenetic affinities of the Shoebill (Balaeniceps rex)". Journal für Ornithologie.

Mikhailov, Konstantin E. (1995). "Eggshell structure in the shoebill and pelecaniform birds: comparison with hamerkop, herons, ibises and storks". Canadian Journal of Zoology. 73 (9): 1754–70.

Muir, Allan; King, C.E. (January 2013). "Management and husbandry guidelines for Shoebills Balaeniceps rex in captivity". International Zoo Yearbook. 47 (1): 181–189.

Stevenson, Terry and Fanshawe, John (2001). Field Guide to the Birds of East Africa: Kenya, Tanzania, Uganda, Rwanda, Burundi. Elsevier Science.

Tomita, Julie (2014). "Challenges and successes in the propagation of the Shoebill Balaeniceps rex: with detailed observations from Tampa's Lowry Park Zoo, Florida". International Zoo Yearbook. 132 (1): 69–82.

Williams, J.G; Arlott, N (1980). A Gield Guide to the Birds of East Africa. Collins.

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a-dinosaur-a-day · 5 years ago

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Eudyptula minor

By J. J. Harrison, CC BY-SA 3.0

Etymology: Good Diver

First Described By: Bonaparte, 1856

Status: Extant, Least Concern

Time and Place: From 12,000 years ago until today, in the Holocene of the Quaternary

Little Penguins are known from the coast of Australia and New Zealand

Physical Description: Little Penguins are some of the most adorable penguins alive today, and the reason is clear: they’re smol! Little Penguins range in size between 40 and 45 centimeters in length, and none weigh more than 2.1 kilograms. They are a blue-grey on their backs and white on their bellies and necks. They have very small flippers, which can be entirely blue or blue only in the center with white banding around it. They have short little tails and small feet, which are formed into lightly orange flippers. Their beaks are short and round, and either light in color or dark depending on the population. The juveniles tend to be a somewhat duller color than the adults, but usually very similar overall.

By Magnus Kjaergaard, CC BY 3.0

Diet: Little Penguins feed mainly on fish that form schools in the pelagic zone of the ocean (rather than closer to the coast). They’ll also feed on cephalopods and crustaceans.

By Francesco Veronesi, CC BY-SA 2.0

Behavior: These nocturnal penguins will capture their food via pursuit-diving, mainly swimming around schools of fish in tighter and tighter circles until finally - woosh! - they dive into the middle and grab as much food as they can. In shallower water, they do pursue the fish more directly. They can dive as deep as 50 meters underwater, sometimes more - including 69 meters deep. They go up to 62 kilometers away from the nesting and sleeping colony sites, though they can usually only go a fraction of that in a single day and longer distances are reserved for multiple day trips. Females tend to forage more than the males. They feed alone, though they do forage in groups. They are extremely noisy in their colonies, making a variety of trills, brays, growls, grunts, yelping, trumpeting, and wailing sounds to one another. They do not migrate, but do stay near the breeding colony extensively during the moulting and nesting season. Juveniles will leave the colony for a large amount of time, but do eventually return to breed where they were born.

By Phillip Island Tourism, CC BY-SA 4.0

Little Penguins begin breeding in July and continue through December, though it varies from colony to colony and from year to year. They tend to stick to one nest site for their whole lives and are also fairly monogamous, though they do divorce from their partners around 76% of the time. If they are unsuccessful in raising any chicks one year, the next year they are more likely to divorce than not. The nests are made in a little bit far apart from one another in the colonie, usually a burrow in the sand lined with plant material. Usually two eggs are laid in the nest and are incubated for a little more than one month by both parents. The chicks hatch extremely fluffy and greyish-brown; they then molt to look dark brown and grey another month later. At this time young birds will form creches together for two more months, hanging out and learning from each other. They then fledge and become juveniles two more months later. They become sexually mature at two to four years of age, and can live for up to 20 years (though shorter is more common). The chicks and nesting colonies tend to feed at dusk.

By Mark Nairn, CC BY 3.0

Ecosystem: Little Penguins live mainly in sandy and rocky coasts, usually near the bases of cliffs and in sand dunes. They will spend most of their time in temperate to sub-arctic marine waters, many miles offshore. They are preyed upon by cats, dogs, rats, foxes, lizards, snakes, ferrets, stoats, seals, and some other ocean predators. They are mostly affected by introduced mammalian predators at this time.

By fir0002, GFDL 1.2

Other: While Little Penguins are, overall, doing alright and are even common in terms of population management; however, a number of human-created threats are affecting certain colonies and bringing many of them to the verge of collapse. Uncontrolled hunting by domesticated dogs and cats are major causes of colony destruction, as are oil spills, fishing interactions (including being caught in nets), human interference and development, as well as cullings by humans attempting to manage populations of other birds. As such, Little Penguins are of major interest for ecological groups in order to preserve their populations in light of these threats. Fossils of this species are known from its current range from the recent ice age.

~ By Meig Dickson

Sources Under the Cut

Baird, R. F. 1992. Fossil avian assemblage of Pitfall Origin from Holocene sediments in Amphitheatre Cave (G-2), South-western Victoria, Australia. Records of the Australian Museum 44:21-44.

Banks, Jonathan C.; Mitchell, Anthony D.; Waas, Joseph R.; Paterson, Adrian M. (2002). "An unexpected pattern of molecular divergence within the blue penguin (Eudyptula minor) complex". Notornis. 49 (1): 29–38.

Bethge, P; Nicol, S; Culik, BM & RP Wilson (1997) "Diving behaviour and energetics in breeding little penguins (Eudyptula minor)". Journal of Zoology 242: 483-502.

Boessenkool, S., J. J. Austin, T. H. Worthy, P. Scofield, A. Cooper, P. J. Seddon, and J. M. Waters. 2009. Relict or colonizer? Extinction and range expansion of penguins in southern New Zealand. Proceedings of the Royal Society B 276:815-821.

Carroll, R. L. 1988. Vertebrate Paleontology and Evolution 1-698.

Chiaradia, A., Forero, M. G., Hobson, K. A., and Cullen, J. M. (2010) Changes in diet and trophic position of a top predator 10 years after a mass mortality of a key prey. – ICES Journal of Marine Science, 67: 1710–1720.

Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017.

Flemming, S.A., Lalas, C., and van Heezik, Y. (2013) "Little penguin (Eudyptula minor) diet at three breeding colonies in New Zealand". New Zealand Journal of Ecology 37: 199–205.

Fordyce, R. E. 1991. The Australasian marine vertebrate record and its climatic and geographic implications. In P. Vickers-Rich, J. M. Monaghan, R. F. Baird, T. H. Rich (eds.), Vertebrate Palaeontology of Australasia 1165-1190.

Grosser, Stefanie; Burridge, Christopher P.; Peucker, Amanda J.; Waters, Jonathan M. (2015-12-14). "Coalescent Modelling Suggests Recent Secondary-Contact of Cryptic Penguin Species". PLOS ONE. 10 (12): –0144966.

Grosser, Stefanie; Rawlence, Nicolas J.; Anderson, Christian N. K.; Smith, Ian W. G.; Scofield, R. Paul; Waters, Jonathan M. (2016-02-10). "Invader or resident? Ancient-DNA reveals rapid species turnover in New Zealand little penguins". Proceedings of the Royal Society B: Biological Sciences. 283 (1824): 20152879.

Littlely, Bryan (10 October 2007). "Fur seals threat to Granite Island penguins". The Advertiser. p. 23.

Martínez, I., Christie, D.A., Jutglar, F. & Garcia, E.F.J. (2019). Little Penguin (Eudyptula minor). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Numata, M; Davis, L & Renner, M (2000) "[Prolonged foraging trips and egg desertion in little penguins (Eudyptula minor)]". New Zealand Journal of Zoology 27: 291-298.

Rawlence, N. J., A. Kardamaki, L. J. Easton, A. J. D. Tennyson, R. P. Scofield and J. M. Waters. 2017. Ancient DNA and morphometric analysis reveal extinction and replacement of New Zealand’s unique black swans. Proceedings of the Royal Society B 284:20170876.

Rodríguez, A., Chiaradia, A., Wasiak, P., Renwick, L., and Dann, P.(2016) "Waddling on the Dark Side: Ambient Light Affects Attendance Behavior of Little Penguins." Journal of Biological Rhythms 31:194-204.

Saraux, Claire; Chiaradia, Andre; Salton, Marcus; Dann, Peter; Viblanc, Vincent A (2016). "Negative effects of wind speed on individual foraging performance and breeding success in little penguins". Ecological Monographs. 86 (1): 61–77.

Simpson, G. G. 1946. Fossil Penguins. Bulletin of the American Museum of Natural History 87(1):1-100.

Tennyson, A. J. D., and P. R. Millener. 1994. Bird extinctions and fossil bones from Mangere Island, Chatham Islands. Notornis, Supplement 41:165-178.

Tennyson, A. J. D., J. H. Cooper, and L. D. Shepherd. 2015. A new species of extinct Pterodroma petrel (Procellariiformes: Procellariidae) from the Chatham Islands, New Zealand. Bulletin of the British Ornithologists' Club 135:267-277.

van Tets, G. F., and S. O'Connor. 1983. The Hunter Island Penguin, and extinct new genus and species form a Tasmanian midden. Records of the Queen Victoria Museum, Launceston 81:1-13.

Wallis, Robert; King, Kristie; Wallis, Anne (2017). "The Little Penguin'Eudyptula minor'on Middle Island, Warrnambool, Victoria: An update on population size and predator management". Victorian Naturalist. 134 (2): 48–51.

Wiebkin, A. S. (2011) Conservation management priorities for little penguin populations in Gulf St Vincent. Report to Adelaide and Mount Lofty Ranges Natural Resources Management Board. South Australian Research and Development Institute (Aquatic Sciences), Adelaide. SARDI Publication No. F2011/000188-1. SARDI Research Report Series No.588. 97pp.

Williams, Tony D. (1995). The Penguins. Oxford, England: Oxford University Press.

Williams, M., A. J. D. Tennyson, and D. Sim. 2014. Island differentiation of New Zealand’s extinct mergansers (Anatidae: Mergini), with description of a new species from Chatham Island. Wildfowl 6:3-34.

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231 notes · View notes

a-dinosaur-a-day · 5 years ago

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Gavia

Common Loon by Amy Widenhofer, CC BY-SA 2.0

Etymology: Unidentified Sea Bird

First Described By: Coues, 1903

Referred Species: G. egeriana, G. schultzi, G. brodkorbi, G. moldavica, G. paradoxa, G. concinna, G. fortis, G. palaeodytes, G. howardae, G. concinna, G. stellata (Red-Throated Loon), G. arctica (Black-Throated Loon), G. pacifica (Pacific Loon), G. immer (Common Loon), G. adamsii (Yellow-Billed Loon)

Status: Extinct - Extant, Near Threatened - Least Concern

Time and Place: Since 18 million years ago, from the Burdigalian of the Miocene of the Neogene until the Holocene of the Quaternary

Loons have lived throughout the Northern Hemisphere, originating on the Eastern Coast of North America and spreading from there through the Neogene until today

Physical Description: Loons are squat birds, with long bodies and tiny little legs, and very short tails. They also have long necks, with round heads and long pointed beaks. They also have small, beady red eyes. The different species of loon differ greatly on color, though there are some common themes. Their backs are darker, usually black, with white streaks; they often have white bellies that may have some black speckles. They have distinctive black and white striping on the neck - though the extent of the striping varies from species to species, with some Loons having stripes all along the neck, and others only in isolated patches, surrounded by black feathers. The heads are usually a dark color, black or grey, with some lightness more towards the top of the head. They have black feet and flippers attached to their weird lopsided legs. In a lot of ways, Loons are modern, toothless Hesperornithines in general appearance and lopsidedness. They range from 53 to 91 centimeters in length - with many sizes in between.

Red-Throated Loon by the Bureau of Land Management, in the Public Domain

Diet: Loons primarily feed on fish, though they will occasionally supplement their diet with other small aquatic animals.

Black-Throated Loon by Bengt Nyman, CC BY 2.0

Behavior: Loons are diving birds, spending most of their time going back and forth in the water searching for food. They will engage in pursuit dives, diving many meters under the water for sources of food, and chasing their fish very vigorously in order to catch them. In some of the better known species, food will be gathered up in ponds and inshore waters and brought back to the young; in the ocean, they’ll join mixed-species flocks in order to gather more fish from the water. Spawns of new fish and crustaceans will often attract groups of Loons to new feeding locations. They tend to swallow gastroliths to aid in crushing hard parts of food in the stomach of the Loons, though they may also aid in causing reguritation when needed Loons are excessively loud during the breeding season and much quieter when hunting; the males will make loud “arroarroarro�� and other cackling calls when fighting over territory, which the females often match. The Common Loon especially makes a very distinctive breeding sound, going “ooo-aaaa-eeeeeeeee” and other rising vowel sounds. While nesting, they’ll also make rising, higher-pitched “week-week-week” calls, depending on the species. But, when not breeding, they are fairly silent birds all things considered.

Pacific Loon by Tim Bowman, in the Public Domain

Loons breed mainly in the warmer summertime months, which of course varies extensively based on habitat and location - some loons begin breeding as late as June, while others start as soon as March. It really depends on how quickly the spring begins to thaw to allow for appropriate nesting time. They make nests out of heaps of plant matter placed near the water, laying between one two three eggs into the nest (though usually it’s just two, no more no less). The incubation period lasts for about a month, and the chicks are usually balls of fluffy brownish-grey down. They take around another two months to fledge, depending somewhat on their parents for food during this time. They usually take about two years to reach sexual maturity, and can live for at least a couple of decades (if not longer). Both parents usually take care of the young and will work together to move the nest if needed due to rising water levels.

Common Loon by Mike’s Birds, CC BY-SA 2.0

Loons are fairly strong fliers, though they do have trouble taking off and many have to run along the water surface while flapping wings in order to take flight - only the Red-Throated Loon can take off from land. IN the air, they can fly for long periods of time in order to migrate. Loons have extensive migration ranges, going from warmer coastal waters in the summer to their breeding sites in more northern locations in the winter. They are also extremely strong swimmers. In general, they really aren’t good at walking - the downside of their funkily-placed little legs!

Red-Throated Loon by Don Faulkner, CC BY-SA 2.0

Ecosystem: Loons mainly live in aquatic habitats - in freshwater pools, ponds, and lakes in cold locations such as tundra and taiga habitat; they will also be found on the Arctic and northern Atlantic/Pacific coasts and in rivers and estuaries along those coasts. They especially prefer to stay along the coasts and in sheltered bays during the wintertime, when it is more dangerous to be out on the open waters. They try to stay to deeper freshwater lakes and ponds when in freshwater habitats, rather than more shallow aquatic locations.

Pacific Loon by the NBII, in the Public Domain

Other: Loons are primarily doing fine, conservation wise; only one species is considered Near Threatened, the Yellow-Billed Loon. This species is suffering due to unsustainable fish harvesting, leading to dramatic population declines in recent years. They are also vulnerable to oil-spills and heavy-metal poisoning. These risks also apply to the other Loon species, they just aren’t as heavily hit by them.

Yellow-Billed Loon by Ryan Askren, in the Public Domain

Species Differences: The oldest definite members of Gavia are known from the early-middle Miocene of the Eastern United States. However, loons in general evolved possibly in the Late Cretaceous, at least by the start of the Cenozoic. There are potential members of Gavia as early as the Eocene. This indicates that Loons evolved fairly rapidly in direct response to vacant niches after the mass extinctions of the time. Other fossil species of Loon include G. egeriana from the Early Miocene of the United States and potentially Czechoslovakia; G. schultzi from the Middle Miocene of Austria; G. brodkorbi from the Late Miocene of the United States; G. moldavica from the Late Miocene of Moldova, G. paradoxa from the Late Miocene of the Ukraine, G. concinna from the Late Miocene and Early Pliocene of the United States, G. fortis from the Early Pliocene of the United States, G. palaeodytes from the Early Pliocene of the United States, G. howardae from the Early Pliocene of the United States, and G. concinna from the late Pliocene of San Diego. This showcases how Loons were much more widely distributed for much of their history, found in more southerly locations during the Neogene and up until the Ice Age.

Red-Throated Loon by Ómar Runólfsson, CC BY 2.0

Today, there are five living Loons, with distinctly different appearances and slightly different ranges. Red-Throated Loons spend their summers in the Arctic Ocean area - so along the northern parts of Russia, Canada, and around Greenland, Alaska, and Scandinavia. They will spend their winters along the coasts of both the Atlantic and Pacific oceans. They are some of the smallest loons, and also the most lightly colored - they have brown plumage and red patches on the front of their necks, and their heads and necks are primarily grey.

Black-Throated Loon by Robert Bergman, in the Public Domain

Black-Throated Loons have similar ranges to the Red-Throated Loons, but only in Eurasia - they are rarely found in North America, only some parts of Alaska. They are also somewhat smaller, but they are black in color over most of their body with distinctive white patches. The tops of their necks and heads are grey, while they have black patches on their throats and black and white striping across their necks.

Pacific Loon by Alan Vernon, CC BY 2.0

The Pacific Loon is found more in North America than in Eurasia, occasionally reaching Northeastern Russia and wintering in Japan and Korea. They also winter along the pacific coast of North America. They are the smallest of all Loons, and look very similar to Black-Throated Loons except for their size and having nrounded heads and thinner bills.

Common Loon by John Picken, CC BY 2.0

Common Loons live throughout the Northernmost part of North America, even extending somewhat into the Continental US; they also will winter along the coasts of North America. They can be found in Greenland and Western Europe, as well as Scandinavia, during the winter; they also congregate in Iceland during the winter. They are larger loons, and don’t have as much striping on their necks; their backs are also in a funky black and white checkerboard pattern.

Yellow-Billed Loon by Norbert Potensky, CC BY-SA 3.0

Finally, the Yellow-Billed Loon - unlike all other loons - have yellow bilsl, instead of grey ones. They have a similar range to the Red-Throated Loon, though somewhat more limited. They also grow extensively large, and have somewhat larger stripe patches on their necks than Common Loons - though not as much as other Loon species.

~ By Meig Dickson

Sources Under the Cut

Appleby, R.H.; Steve C. Madge; Mullarney, Killian (1986). "Identification of divers in immature and winter plumages". British Birds. 79 (8): 365–91.

Armstrong, Edward A. (1970) [1958]. The Folklore of Birds. New York, NY: Dover Publications.

Arnott, W.G. (1964). "Notes on Gavia and Mergvs in Latin Authors". Classical Quarterly. New Series. 14 (2): 249–62.

Bird, Louis; Brown, Jennifer S.H. (2005). Telling Our Stories: Omushkego Legends and Histories from Hudson Bay. Peterborough, ON, Canada: Broadview Press.

Brodkorb, P. 1953. A review of the Pliocene loons. Condor 55(4):211-214

Brodkorb, P. 1955. The avifauna of the Bone Valley Formation. Florida Geological Survey Report of Investigations 14:1-57

Brodkorb, Pierce (1963). "Catalogue of fossil birds. Part 1 (Archaeopterygiformes through Ardeiformes)". Bulletin of the Florida State Museum, Biological Sciences. 7 (4): 179–293.

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Carboneras, Carles (1992). "Family Gaviidae (Divers)". In Josep del Hoyo; Andrew Elliott; Jordi Sargatal (eds.). Handbook of the Birds of the World, Volume 1: Ostrich to Ducks. Barcelona, Spain: Lynx Edicions.

Carboneras, C. & Garcia, E.F.J. (2019). Arctic Loon (Gavia arctica). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Carboneras, C., Christie, D.A. & Garcia, E.F.J. (2019). Common Loon (Gavia immer). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Carboneras, C., Christie, D.A. & Garcia, E.F.J. (2019). Red-throated Loon (Gavia stellata). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Carboneras, C., Christie, D.A. & Garcia, E.F.J. (2019). Yellow-billed Loon (Gavia adamsii). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Carroll, R. L. 1988. Vertebrate Paleontology and Evolution 1-698

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Chandler, R. M. 1990. Fossil birds of the San Diego Formation, Late Pliocene, Blancan, San Diego County, California. Ornithological Monographs 44:73-161

Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017

del Hoyo, J., Collar, N. & Garcia, E.F.J. (2019). Pacific Loon (Gavia pacifica). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Evers, David C., James D. Paruk, Judith W. Mcintyre and Jack F. Barr. 2010. Common Loon (Gavia immer), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology

Guthrie, D. A. 1992. A late Pleistocene avifauna from San Miguel Island, California. Science Series (Los Angeles) 36:319-327

Hastings, A. K., and A. C. Dooley. 2017. Fossil-collecting from the middle Miocene Carmel Church Quarry marine ecosystem in Caroline County, Virginia. The Geological Society of America Field Guide 47:77-88

Howard, H. 1949. New avian records for the Pliocene of California. Carnegie Instuitution of California 584:179-200

Howard, H. 1972. Type specimens of avian fossils in the collections of the Natural History Museum of Los Angeles County. Contributions in Science 1-27

Howard, H. 1978. Late Miocene marine birds from Orange County, California. Natural History Museum of Los Angeles County Contributions in Science 290:1-26

Howard, H. 1982. Fossil birds from Tertiary marine beds at Oceanside, San Diego County, California, with discriptions of two species of the genera Uria and Cepphus (Aves: Alcidae). Contributions in Science, Natural History Museum of Los Angeles County 341:1-15

Jobling, J. A. 2010. The Helm Dictionary of Scientific Bird Names. Christopher Helm Publishing, A&C Black Publishers Ltd, London.

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Linnaeus, C. 1758. Systema Naturae per Regna Tria Naturae, Secundum Classes, Ordines, Genera, Species, cum Characteribus, Differentiis, Synonymis, Locis. Editio Decima 1:1-824

Mayr, Gerald (2004). "A partial skeleton of a new fossil loon (Aves, Gaviiformes) from the early Oligocene of Germany with preserved stomach content" (PDF). J. Ornithol. 145 (4): 281–86.

Mayr, Gerald (2009). Paleogene Fossil Birds. Heidelberg/New York: Springer-Verlag.

Miller, L., and R. I. Bowman. 1958. Further bird remains from the San Diego Pliocene. Contributions in Science, Los Angeles County Museum 20:1-15

Mlíkovský, Jirí (2002). Cenozoic Birds of the World, Part 1: Europe (PDF). Prague: Ninox Press.

Mobley, Jason A. (2008). Birds of the World. Marshall Cavendish. p. 382.

Montana Fish, Wildlife & Parks (Montana FW&P) (2007): Animal Field Guide: Common Loon; retrieved 2007-05-12.

Moran, Mark; Sceurman, Mark; Godfrey, Linda S. & Hendricks, Richard D. (2005): Weird Wisconsin: Your Travel Guide to Wisconsin's Local Legends and Best Kept Secrets. Sterling Publishing. ISBN 0-7607-5944-8, p. 78

Olson, Storrs L. (1985). "Section X.I. Gaviiformes" (PDF). In Farner, D.S.; King, J.R.; Parkes, Kenneth C. (eds.). Avian Biology. 8. pp. 212–14.

Olson, S. L., and P. C. Rasmussen. 2001. Miocene and Pliocene birds from the Lee Creek Mine, North Carolina. Smithsonian Contributions to Paleobiology 90:233-365

Parmalee, P. W. 1992. A late Pleistocene avifauna from northwestern Alabama. Science Series, Los Angeles Museum of Natural History, Science, and Art 36:307-318

Piper, W.H.; Evers, D.C.; Meyer, M.W.; Tischler, K.B. & Klich, M. (2000): Do common loons mate for life?: scientific investigation of a widespread myth. In: McIntyre, J. & Evers, D.C. (eds.): Loons: old history and new findings – proceedings of a symposium from the 1997 meeting of the American Ornithologists' Union: 43–49. North American Loon Fund, Meredith, New Hampshire.

Piper, W.H.; Tischler, K.B. & Klich, M. (2000). "Territory acquisition in loons: The importance of take-over". Animal Behaviour. 59 (2): 385–94.

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Mesetaornis polaris

By Scott Reid

Etymology: Meseta Bird

First Described By: Myrcha et al., 2002

Status: Extinct

Time and Place: Between 40 and 38 million years ago, in the Bartonian age of the Eocene of the Paleogene

Mesetaornis is known from the Telm 7 member of the La Meseta Formation on Seymour Island, Antarctica

Physical Description: Mesetaornis is one of our early penguins - those long-billed weirdos of the first half of the Cenozoic, which paved the way for the adorable friends we known from the Southern Hemisphere today. It had extremely long toes compared to other penguins, and actually had the fourth toe (hallux), giving it very weird feet compared to its relatives. A small early penguin, it was much smaller than such species as Palaeeudyptes and Anthropornis, while probably around the same size as Delphinornis. This means it probably wouldn’t have reached taller than 70 or so centimeters in height (as a very rough estimate). Of course, this is just conjecture, as all we have of it are toe bones. Like other penguins, it would have stood upright, waddled about, and been more adept to life in the water than on land.

Diet: As in other penguins, Mesetaornis would have primarily fed upon fish and other aquatic organisms.

Behavior: Mesetaornis probably behaved like other penguins, spending most of its time near the water and diving about for food. Being closer to living penguins than earlier forms, it was probably not as good in the water as those today, but still better than those who came before. It could dive and fly through the water to some extent, using its flipper-wings to do so; it would have also been very awkward on land. As a penguin, Mesetaornis would have probably lived in large flocks, and taken care of its young with the help of others in the group.

By Ripley Cook

Ecosystem: Mesetaornis lived in a subtropical coast, right off the edge of Antarctica, which was teeming with life unique to the area while the rest of the world was covered in a (slowly receding) jungle. Instead, this coast would have been rocky and cooler, surrounding a system of estuaries and bays with plants such as magnolias and ferns populating the shores. This would have been an extremely fertile environment for penguins, and it shows in the fossil record! There were plenty of bivalves, gastropods, cephalopods, sharks, and fish, as well as a variety of turtles. There were mammals there, too, including small rodent ones and larger, more bulky forms. As for other dinosaurs, there were Pseudotoothed Birds, early Petrels, flamingo-ducks, and a truly hopeless number of penguins - including Delphinornis, Palaeeudyptes, Marambiornis, Anthropornis, and Archaeospheniscus - making this the place to go to see the early evolution of penguins!

Other: Mesetaornis is a very early derived penguin, grouped up with other early penguins like Delphinornis and Marambiornis. These were full penguins, not quite as weirdly loon-shaped as earlier forms like Waimanu, but they weren’t as big as later forms or had the same beak as living penguins. As such, it represents one of many early penguins that showcase the evolution of the group - and Mesetaornis was a weird one, since it had freakishly long toes!

~ By Meig Dickson

Sources Under the Cut

Chavez, M. 2007. Fossil birds of Chile and Antarctic Peninsula. Arquivos do Museo Nacional, Rio de Janeiro 65(4):551-572

Cione, A. L., and M. A. Reguero. 1994. New records of the sharks Isurus and Hexanchus from the Eocene of Seymour Island, Antarctica. Proceedings of the Geologists' Association 105:1-14

Hospitaleche, C.A., Reguero, M. and Santillana, S., 2017. Aprosdokitos mikrotero gen. et sp. nov., the tiniest Sphenisciformes that lived in Antarctica during the Paleogene. Neues Jahrbuch für Geologie und Paläontologie-Abhandlungen, 283(1), pp.25-34.

Jadwiszczak, P. 2006. Eocene penguins of Seymour Island, Antarctica: Taxonomy. Polish Polar Research 27(1):3-62

Jadwiszczak, P., 2008. Short Note: An intriguing penguin bone from the Late Eocene of Seymour Island, Antarctic Peninsula. Antarctic Science, 20(6), pp.589-590.

Jadwiszczak, P. and Gaździcki, A., 2014. First report on hind-toe development in Eocene Antarctic penguins. Antarctic Science, 26(3), pp.279-280.

Ksepka, D. T., S. Bertelli, and N. P. Giannini. 2006. The phylogeny of the living and fossil Sphenisciformes (penguins). Cladistics 22:412-441

Ksepka, D.T. and Ando, T., 2011. Penguins past, present, and future: trends in the evolution of the Sphenisciformes. Living Dinosaurs, pp.155-186.

Mayr, G. 2009. Paleogene Fossil Birds. Springer-Verlag Berlin Heidelberg.

Mayr, G. 2017. Avian Evolution: The Fossil Record of Birds and its Paleobiological Significance. Topics in Paleobiology, Wiley Blackwell. West Sussex.

Mayr, G., De Pietri, V.L. and Scofield, R.P., 2017. A new fossil from the mid-Paleocene of New Zealand reveals an unexpected diversity of world’s oldest penguins. The Science of Nature, 104(3-4), p.9.

Myrcha, A., P. Jadwiszczak, C. P. Tambussi, J. I. Noriega, A. Gazdzicki, A. Tatur, and R. A. Valle. 2002. Taxonomic revision of Eocene Antarctic penguins based on tarsometatarsal morphology. Polish Polar Research 23(1):5-46

Reguero, M. A., S. A. Marenssi, and S. N. Santillana. 2012. Weddellian marine/coastal vertebrates diversity from a basal horizon (Ypresian, Eocene) of the Cucullaea I Allomember, La Meseta formation, Seymour (Marambio) Island, Antarctica. 19(3):275-284

Stilwell, J. D., and W. J. Zinsmeister. 1992. Molluscan Systematics and Biostratigraphy. Antarctic Research Series, AGU 55

Woodburne, M. O., and W. J. Zinmeister. 1982. Fossil Land Mammal from Antarctica. Science 218:284-286

#Mesetaornis polaris #Mesetaornis #Penguin #Dinosaur #Bird #Birblr #Palaeoblr #Factfile #Dinosaurs #Ardeaen #Aequorlitornithian #Water Wednesday #Paleogene #Antarctica #Piscivore

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Xenerodiops mycter

By Ripley Cook

Etymology: The strangely appearing Heron

First Described By: Rasmussen et al., 1987

Status: Extinct

Time and Place: Between 30.2 and 29.5 million years ago, in the Rupelian of the Oligocene

Xenerodiops is known from the Jebel Qatrani Formation of Egypt

Physical Description: Xenerodiops is a strange intermediate bird, slightly smaller than the smallest living stork - probably no longer than 70 centimeters or so. Still, it was larger than most living species of herons - so this wasn’t a small bird. It was fairly similar to storks too, in terms of the shapes of the known bones, so it seems likely that Xenerodiops was a precursor to that modern dinosaur group. It had a very strong, pointed bill, though, more like herons than storks - adapted for biting and even stabbing prey, rather than snapping up food trapped in vegetation. This weirdly short, heavy bill was also curved downwards, so different from living herons and somewhat similar to living storks. Its wings were heavy and robust, and in general, this was a very sturdy sort of bird.

Diet: Xenerodiops probably fed on animals and, if it is a heron-stork like thing as supposed, it is logical to assume these animals were found in bodies of water.

Behavior: Without more fossils of Xenerodiops, it is difficult to piece together how it would have looked - especially without legs, which would point to whether or not this bird waded in the water as those birds it seems to be closely related to do. Still, for now, that is the simplest explanation for its general lifestyle. Its large beak would have been useful in reaching out into bodies of water and grabbing food sharply, possibly even stabbing it; being curved downwards, it could have been used similar to living stork bills in probing for food in the water. It is possible, then, that Xenerodiops did similar things, going into the water and grabbing as much food with its strong beak as possible, sensing food where it could not see. With its strong, robust wings, Xenerodiops would have been a powerful flier, able to gain a lot of movement from very few flaps of their wings. As with other dinosaurs, Xenerodiops would have probably taken care of its young; whether or not it did so in large colonies or in isolated nests is difficult to tell at this point.

Creatures of the Jebel Qatrani by Stanton F. Fink, CC By-SA 2.5

Ecosystem: The Jebel Qatrani Formation is a fairly famous ecosystem from the Oligocene, a time when the weird creatures of the Eocene and Paleocene were beginning to transition into animals similar to those we see today. In addition to almost-modern forms, of course, there were also the fun offshoots, which is probably where Xenerodiops lies. Jebel Qatrani is famous for its transitional fossils, especially among mammals. It was a thick swamp ecosystem, extremely warm and wet - a tropical wetland, filled with animals taking advantage of the lush plantlife. This place was filled with a variety of mammals - dugong relatives like Eosiren, a transitional primate Aegyptopithecus, a weird pointy heavyset mammal Arsinoitherium, the slightly more hippo-esque but still weird Bothriogenys, giant hyraxes, the lemur-like Plesiopithecus, the false ungulate Herodotius, the strange carnivores Ptolemaia and Qarunavus, a marsupial Peratherium, hyaenodonts like Metapterodon, and an alarming number of rodents. Turtles and crocodilians and other reptiles were plentiful too, like the turtle Albertwoodemys, the crocodile Crocodylus megarhinus, a gharial Eogavialis, and the snake Pterosphenus. As for fish, there were a variety of tetras, snakeheads, and catfish.

Xenerodiops wasn’t the only dinosaur in this environment, either. Many other weird birds were found here, some just as odd and unplaceable as Xenerodiops. For example, Eremopezus lived here - it was some sort of large, flightless bird. Beyond that, we have no idea. There was also the (iconic and large) swimming flamingo, Palaelodus. An even larger sort of shoebill than the living one, Goliathia, prowled the swamps. A giant true stork, Palaeoephippiorhynchus, was a major fixture of the landscape. There were Jacanas like Nuphranassa and Janipes, turacos like Crinifer, and even birds of prey. In a lot of ways, therefore, the birds of the area were even weirder than the mammals - and Xenerodiops was just one of many.

By José Carlos Cortés

Other: What exactly Xenerodiops is remains a mystery. Its weird combination of characteristics points to it being in the group of dinosaurs including a large number of living water birds - and both storks and herons. However, research has shown that storks and herons are actually somewhat removed from each other, with herons being more closely related to pelicans, shoebills, ibises, and even boobies than to storks. Is Xenerodiops, then, a weird, transitional, extinct member of this group of dinosaurs? Is it another evolutionary experiment altogether, with traits of many members of this group? Something else entirely? Only more fossils will help us to make the picture clearer. Some of these traits are shared in other weird waterbirds of the Paleogene (such as Mangystania), and it is entirely possible that there is an extinct clade of these animals, separate from all living members of the group.

~ By Meig Dickson

Sources under the Cut

Mayr, G. 2009. Paleogene Fossil Birds. Springer-Verlag Berlin Heidelberg.

Mayr, G. 2017. Avian Evolution: The Fossil Record of Birds and its Paleobiological Significance. Topics in Paleobiology, Wiley Blackwell. West Sussex.

Mlíkovský, Jiří (2003), "Early Miocene Birds of Djebel Zelten, Libya" (PDF), Časopis Národního muzea, Řada přírodovědná, 172 (1–4): 114–120.

Rasmussen, D. T., S. L. Olson, E. L. Simons. 1987. Fossil Birds from the Oligocene Jebel Qatrani Formation Fayum Province, Egypt. Smithsonian Contributions to Paleobiology 62: 1 - 19.

Zvonov, E. A., N. V. Zelenkov, I. G. Danilov. 2015. A New unusual waterbird (Aves, ?Suliformes) from the Eocene of Kazakhstan. Journal of Vertebrate Paleontology: e1035783.

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Jabiru mycteria

By Andreas Trepte, CC BY-SA 4.0

Etymology: Tupí for Very Big Bird

First Described By: Hellmayr, 1906

Status: Extant, Least Concern

Time and Place: From 126,000 years ago until the present, from the Tarantian of the Pleistocene to the Holocene

Jabiru are primarily known from the Amazon basin, though during the Ice Age they were much more widespread (shown in light blue)

Physical Description: Jabiru are extremely large storks, primarily white in color all over their bodies and wings. They have very long, skinny black legs, like other storks, and black heads. Their heads are ridiculously long, with beaks that make up three-forths of the entire head – these beaks are long, triangular, and pointed. Underneath the black neck, they have red throat sacks which stand out from the rest of the body. Males differ from females in having longer beaks and more vibrant red color on their throat sacks; the juveniles, meanwhile, are more grey than the adults. Babies of this species are especially fat and fluffy, and covered in white feathers. In terms of size, Jabiru are the tallest flying birds in Latin America, reaching the same height as the flightless rhea – up to 1.53 meters tall. So, you know, about the same height as a shorter person. They grow between 1.2 and 1.4 meters long in general, from head to tail; they have some of the largest wingspans of any South American bird, reaching between 2.3 and 2.6 meters long – only the Andean Condor has a larger wingspan on that continent. The beaks can range between 25 and 35 centimeters. In short, though Jabiru can honestly look really gangly and ridiculous, they are also absolutely, terrifyingly, huge.

By Charles J. Sharp, CC BY-SA 4.0

Diet: Jabiru feed on fish, frogs, snakes, insects, baby crocodilians, and turtles – though the bulk is fish, they really can’t be classified as anything other than a carnivore.

By Lukja, CC BY-SA 3.0

Behavior: Jabiru will wade in the shallows of the water, splashing their bills into it to disturb prey. They will look for prey mainly by feeling around with their beaks, but they also see the food and reach out to grab it. THey then carry the food to the shore and dismantle it there, where it can’t as easily slip out (especially in the case of fish). They’ll also use sounds – baby caimans, especially, are found by listening for their distress calls. They tend to feed in large groups of up to fifty birds during the dry season, congregating where food can be found; in the west season, they are more solitary. They do associate with other storks and ibises as well during feeding. They are very silent away from the nest, stalking in the quiet; they will make very loud bill claps when alarmed, and make soft coughs and bill claps during copulation and nest displays. Their pouches are inflated during mating displace, and also as a threat to other members of species when they feel their spaces is being invaded.

By Charles J. Sharp, CC BY-SA 4.0

Despite being ridiculously huge and a little silly looking on the ground, Jabiru are amazingly graceful fliers, soaring above the ground with the agility of the Andean Condor – which it rivals in size. They don’t migrate much, but congregate in small groups with other storks and ibises and moving in relation to rainfall. They will fly to seek out new places of food. Breeding varies from location to location, usually at the end of the dry season and the start of the wet season. They usually nest alone, but they will form groups of up to six nests – though some populations breed in mixed colonies with other storks. They make nests in tall palm trees, so if you needed to imagine a person-sized bird nesting in a tree, here you go. They sometimes nest in tall mangroves or other types of trees in pine savanna. The nests are made of sticks and mud and are used year to year. Three to four eggs are laid per season, and the young hatch white and fluffy and dependent on the parents. Both parents will incubate the eggs. The babies leave the nest after about a hundred days, though the young stick with the parents for another three months. As such, most mated pairs alternate breeding years. The pairs mate for life as well. Jabiru can live on average for thirty-six years.

By Charles J. Sharp, CC BY-SA 4.0

Ecosystem: Jabiru live in large freshwater marshes, pine-savanna, ranches near ponds and lagoons, near large rivers and lakes, in estuaries, and rice fields. The young are specially preyed upon by raccoons, other storks, and humans; but healthy adults have no known predators.

By Andreas Trepte, CC BY-SA 4.0

Other: Though the Jabiru stork already has a very large range today, fossil evidence indicates that during the last glacial maximum its range was even larger, extending up into North America. It is thus possible that climate change following the end of the last Ice Age lead to a decline in Jabiru populations and a decrease in Jabiru range. That being said, Jabiru today are doing perfectly fine in terms of conservation and population – they are considered threatened with extinction, and therea re considered to be tens of thousands of birds worldwide. Still, Central American populations of Jabiru are on the decline possibly as a continuation of the elimination of this bird from North America in general; in the Amazon, the chicks are considered a source of food by native populations.

~ By Meig Dickson

Sources under the Cut

Allen, G. M. 1932. A Pleistocene bat from Florida. Journal of Mammalogy 13(3):256-259

Campbell, K. E. 1979. The non-passerine Pleistocene avifauna of the Talara Tar Seeps, northwestern Peru. Royal Ontario Museum Life Sciences Contribution 118:1-203

Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017

Elliott, A., Garcia, E.F.J., Kirwan, G.M. & Boesman, P. (2019). Jabiru (Jabiru mycteria). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Hancock, Kushan. 1992. Storks, Ibises, and Spoonbills of the World. Princeton University Press.

Sellards, E. H. 1916. Human remains and associated fossils from the Pleistocene of Florida. Florida Geological Survey Annual Report 8:120-160

Shufeldt, R. W. 1917. Fossil birds found at Vero, Florida. Florida State Geological Survey Annual Report 9:35-42

Simpson, G. G. 1929. Pleistocene mammalian fauna of the Seminole Field, Pinellas County, Florida. Bulletin of the American Museum of Natural History 56(8):561-599

Walsh, S. A.; Sánchez, R. 2008. The first Cenozoic fossil bird from Venezuela. Paläontologische Zeitschrift. 82 (2): 105–112.

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Inkayacu paracasensis

By José Carlos Cortés

Etymology: King of the Water

First Described By: Clarke et al., 2010

Status: Extinct

Time and Place: Between 37.2 and 33.9 million years ago, in the Priabonian age of the Eocene of the Paleogene

Inkayacu is known from Yumaque Point of the Otuma Formation in Ica, Peru

Physical Description: Inkayacu was an extinct penguin, and had a lot of similar traits to other extinct penguins - though resembling modern forms, extinct ones were unique in having extremely large bill size and just large body size in general. Inkayacu was about 1.5 meters long, which is a significant jump from the biggest living penguin (the Emperor Penguin at 1.2 meters long), and Inkayacu wasn’t even the biggest penguin at the time. It had a long, pointed bill, much longer than those seen on living members of the group. And - uniquely - we know the color of Inkayacu! Unlike living penguins, which are all varying shades of black and white with some splashes of other colors elsewhere, Inkayacu was grey and brown. We only known these colors form the flippers (wings), which show grey backs of the flipper and brown fronts, but it’s reasonable to suppose this pattern would follow the patterns of living penguins, where the color of the back of the flipper extends throughout the back of the animal, and the color of the front extends to the front. Thus, we depict Inkayacu with a grey back and a brown front, but this is still a conjecture. The melanosomes are similar to modern birds, long and narrow within the feathers - living penguins actually have wider ones. Other than that, the feathers of Inkayacu are similar to modern penguins in other ways, indicating that it had the same aquatic lifestyle. As such, it was flightless.

Diet: Inkayacu, like other penguins, would have fed on a wide variety of fish and aquatic invertebrates.

Icadyptes and Inkayacu by Apokryltaros, CC BY-SA 3.0

Behavior: Though shaped in a lot of ways like living penguins, Inkayacu was different in a number of ways. It had fewer melanosomes in its feathers than living penguins - and these melanosomes provide rigidity in modern penguin feathers that help with deep-sea diving. Without such melanosomes, Inkayacu might not have been as well adapted to deep diving. Still, it was clearly adapted for spending its life in the sea, diving and sea-flying all over its habitat. It would have used its long beak to stab and grab food, especially slippery food that might be hard to get a grip on. Using its flippers, it could propel itself through the water. Its feet were small and not good for moving, so on land it would probably waddle. This is not an uncommon bird to find, fossil-wise, and so it stands to reason that it would have been very social like living penguins. It would have probably laid its eggs on land, and took care of its young with mated partners. Given it lived in Peru, in the Eocene, it was more adapted for warm weather than cold, and wouldn’t have ventured very far south.

By Julio Lacerda, used with permission from Earth Archives

Ecosystem: Inkayacu lived along the Pervuian Priabonian coast, the Western coast of South America right as the global rainforest of the Eocene was collapsing and being replaced with more varying and arid climates. This was also a time of notable climate change and effects on the ocean, leading to a small mass extinction (especially in the oceans) at this time - killing off many iconic forms, including proto-whales. The conditions of this mass extinction actually allowed the penguins to flourish, and Inkayacu was a part of that flourishing. Inkayacu lived alongside proto-whales like Cynthiacetus and Mystacodon - a toothed baleen whale. Inkayacu wasn’t the only penguin in this area, but was joined by the larger and longer-beaked Icadyptes. As for proper fish, there were ray-finned fish like Engraulis and Sardinops, and unnamed sharks. There may have also been the marine snake Pterosphenus. There were many kinds of invertebrates as well. Inkayacu would probably have had to look out for the sharks and whales, though the fish would have had to look out for it! The coast that Inkayacu would have spent its time on would probably have been more rocky than sandy, though it’s uncertain either way.

By Ripley Cook

Other: Inkayacu is very closely related to living penguins and is just outside the group of modern penguins and their closest relatives, so it showcases the evolution of penguins towards what we’re familiar with today. It’s interesting to note that short beaks seem to be characteristic of the modern crown group of penguins, and that long beaks were found in penguins even as close to the crown group as Inkayacu.

~ By Meig Dickson

Sources under the Cut

Acosta Hospitaleche, C., and M. Stucchi. 2005. Nuevos restos terciarios de Spheniscidae (Aves, sphenisciformes) procedentes de la Costa del Peru. Revista española de paleontología 20(1):1-5

Clarke, J.A.; Ksepka, D.T.; Stucchi, M.; Urbina, M.; Giannini, N.; Bertelli, S.; Narváez, Y.; Boyd, C.A. (2007). "Paleogene equatorial penguins challenge the proposed relationship between biogeography, diversity, and Cenozoic climate change". Proceedings of the National Academy of Sciences. 104 (28): 11545–11550.

Clarke, J. A., D. T. Ksepka, R. Salas-Gismondi, A. J. Altamirano, M. D. Shawkey, L. D’Alba, J. Vinther, T. J. DeVries, and P. Baby. 2010. Fossil evidence for evolution of the shape and color of penguin feathers. Science 330

Hoffstetter, R. 1958. Un serpent marin du genre Pterosphenus (Pt. Sheppardi nov. sp.) dans L’Éocène supérieur de L’Équateur (Amérique de Sud). Bulletin de la Société Géologique de France 6:45-50

Hooker, J.J.; Collinson, M.E.; Sille, N.P. (2004). "Eocene-Oligocene mammalian faunal turnover in the Hampshire Basin, UK: calibration to the global time scale and the major cooling event". Journal of the Geological Society. 161 (2): 161–172.

Ivany, Linda C.; Patterson, William P.; Lohmann, Kyger C. (2000). "Cooler winters as a possible cause of mass extinctions at the Eocene/Oligocene boundary". Nature. 407 (6806): 887–890.

Köhler, M; Moyà-Solà, S (December 1999). "A finding of oligocene primates on the European continent". Proceedings of the National Academy of Sciences of the United States of America. 96 (25): 14664–7.

Li, Y. X.; Jiao, W. J.; Liu, Z. H.; Jin, J. H.; Wang, D. H.; He, Y. X.; Quan, C. (2016-02-11). "Terrestrial responses of low-latitude Asia to the Eocene–Oligocene climate transition revealed by integrated chronostratigraphy". Clim. Past. 12 (2): 255–272.

Marocco, R., and C. d.e. Muizon. 1988. Los vertebrados del Neogeno de La Costa Sur del Perú: Ambiente sedimentario y condiciones de fosilización. Bulletin de l'Institut Frances d'Etudes Andines 17(2):105-117

Martinez-Cacers, M., and C. de Muizon. 2011. A toothed mysticete from the Middle Eocene to Lower Oligocene of the Pisco Basin, Peru: new data on the origin and feeding evolution of Mysticeti. Sixth Triennial Conference on Secondary Adaptation of Tetrapods to Life in Water 56-57

Molina, Eustoquio; Gonzalvo, Concepción; Ortiz, Silvia; Cruz, Luis E. (2006-02-28). "Foraminiferal turnover across the Eocene–Oligocene transition at Fuente Caldera, southern Spain: No cause–effect relationship between meteorite impacts and extinctions". Marine Micropaleontology. 58 (4): 270–286.

Shackleton, N. J. (1986-10-01). "Boundaries and Events in the Paleogene Paleogene stable isotope events". Palaeogeography, Palaeoclimatology, Palaeoecology. 57 (1): 91–102.

Vinther, J., D. E. G. Briggs, R. O. Prum, V. Saranathan. 2008. The colour of fossil feathers. Biology Letters 4 (5): 522 - 525.

Zachos, James C.; Quinn, Terrence M.; Salamy, Karen A. (1996-06-01). "High-resolution (104 years) deep-sea foraminiferal stable isotope records of the Eocene-Oligocene climate transition". Paleoceanography. 11 (3): 251–266.

Zhang, R.; Kravchinsky, V.A.; Yue, L. (2012). "Link between Global Cooling and Mammalian Transformation across the Eocene-Oligocene Boundary in the Continental Interior of Asia]". International Journal of Earth Sciences. 101 (8): 2193–2200.

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a-dinosaur-a-day · 5 years ago

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Meganhinga chilensis

By Ripley Cook

Etymology: The Great Darter

First Described By: Alvarenga, 1995

Status: Extinct

Time and Place: 17 to 14 million years ago, in the Burdigalian to Langhian ages of the Miocene

Meganhinga is known from the Malla-Mall Member of the Cura-Mallín Formation

Physical Description: Meganhinga was, in a lot of ways, essentially just a scaled-up version of the birds we know today as Darters - it had a long body, with a very long neck, small head, and long pointy beak. This was similar in every way to living Darters. It was quite long for a darter, about a meter long, which is about as big as they get today (but usually living Darters are much smaller). But, notably for Darters, it had quite small wings indeed. This means that Meganhinga was, above all, a flightless bird.

Diet: Meganhinga probably fed on fish and other vertebrates, like its living relatives; its uncertain if it was able to dive as well as its living relatives, so its possible it relied more on land life than its living relatives.

Behavior: Meganhinga, being flightless, probably would have spent more of its time on land grabbing food than living relatives. Still, despite this, it would have spent much of its time by the shoreline, diving into the water and searching for food. Its long neck could be darted out to grab food, including fish, as it would stand on the shoreline. It would probably breed in colonies, and it seems most likely that they would have been somewhat monogamous in breeding habits like living Darters.

Ecosystem: Meganhinga lived in a lake and river basin near the coast, filled with plenty of aquatic places for Meganhinga to find food. This freshwater basin was created by extensive volcanic activity, which would have decided affected the ecology and creatures living there. Many different kinds of animals resided here with Meganhinga, though most were mammals; creatures such as Toxodonts, Astrapotherium, marsupials like Polydolops, the fascinating Mylodontid sloth Nematherium, a glyptodont, Protypotherium, a wide variety of rodents, and other creatures all populated the valley. Despite this, there doesn’t really seem to be another bird from this formation known at this time.

Other: Meganhinga is quite distinctive for being, possibly, the oldest known species of Darter, which makes the fact that it is quite weird compared to living darters very noticeable. In fact, a variety of large, flightless Darters from the Miocene have been found - Meganhinga, Macranhinga, and Giganhinga - all from the are of Chile in the Miocene. This indicates flightlessness was a major lifemode for Darters prior to modern times. Interestingly enough, some phylogenies indicate modern darters evolved from these forms, meaning that these flightless birds re-evolved flying ability in response to environmental factors.

~ By Meig Dickson

Sources under the Cut

Alvarenga, H. F. 1995. A large and probably flightless Anhinga from the Miocene of Chile. Courier Forschungsinstitut Senckenberg 181: 149-161.

Areta, J. I., J. I. Noriega, D. Angolin, F. Angolin. 2007. A giant darter (Pelecaniformes: Anhingidae) from the Upper Miocene of Argentina and weight calculation of fossil Anhingidae. N. Jb. Geol. Palaont. Abh. 243 (3): 343 - 350.

Chavez, M. 2007. Fossil birds of Chile and Antarctic Peninsula. Arquivos do Museo Nacional, Rio de Janeiro 65(4):551-572

Croft, D. A., J. P. Radic, E. Zurita, R. Charrier, J. J. Flynn, A. R. Wyss. 2003. A Miocene toxodontid (Mammalia: Notoungulata) from the sedimentary series of the Cura-Mallín Formation, Lonquimay, Chile. Revista geológica de Chile 30 (2): 285 - 298.

Croft, D. A., R. Charrier, J. J. Flynn, A. R. Wyss. 2008. Recent additions to knowledge of Tertiary mammals from the Chilean Andes. Simposio Paleontología en Chile 1: 91 - 96.

Flynn, J. J., R. Charrier, D. A. Croft, P. B. Gans, T. M. Herriott, J. A. Wertheim, A. R. Wyss. 2008. Chronologic implications of new Miocene mammals from the Cura-Mallín and Trapa Trapa formations, Laguna del Laja area, south central Chile. Journal of South American Earth Sciences 26 (4): 412 - 423.

Mayr, G. 2017. Avian Evolution: The Fossil Record of Birds and its Paleobiological Significance. Topics in Paleobiology, Wiley Blackwell. West Sussex.

Pedroza, V., J. P. Le Roux, N. M. Guitérrez, V. E. Vicencio. 2017. Stratigraphy, sedimentology, and geothermal reservoir potential of the volcaniclastic Cura-Mallín succession at Lonquimay, Chile. Journal of South American Earth Sciences 77: 1 - 20.

Rubilar, A. 1994. Diversidad ictiologica en depositos continentales miocenos de la Formacion Cura-Mallin, Chile (37-39°S): implicancias paleogeograficas. Revista Geológica de Chile 21 (1): 23- 29.

Suárez, M., C. Emparan. 1995. The stratigraphy, geochronology and paleophysiography of a Miocene fresh-water interarc basin, southern Chile. Journal of South American Earth Sciences 8 (1): 17 - 31.

#Meganhinga #Meganhinga chilensis #Darter #Dinosaur #Bird #Birds #Prehistoric Life #Palaeoblr #Birblr #Dinosaurs #Ardeaen #Prehistory #Paleontology #Aequorlitornithian #Terrestrial Tuesday #Piscivore #South America #Neogene

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a-dinosaur-a-day · 6 years ago

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Apteribis

By Scott Reid

Etymology: Wingless Ibis

First Described By: Olson & Wetmore, 1976

Referred Species: A. glenos (Molokai Flightless Ibis), A. brevis (Maui Flightless Ibis)

Status: Extinct

Time and Place: Between 200,000 years ago until sometime in the past 1000 years, from the Chibanian of the Pleistocene through the Holocene

Apteribis is known from the islands of Maui, Lanai, and Molokai

Physical Description: Apteribis looked, in a lot of ways, like your typical Ibis - it had a very long bill and skinny legs. Beyond that, though, it looked very different - it was more squat, for one, and it had a large round body. It also basically didn’t have any wings. This gave it, in a lot of ways, the appearance of a Kiwi, but it was an Ibis! We do have feathers from this animal that show it was brown in color, some darker brown and other feathers lighter brown of course but still overall brown - helping to add to that appearance like a Kiwi. And, like the living Kiwi, it was flightless.

Diet: There is nothing to suggest that Apteribis wasn’t like other Ibises, feeding mainly on invertebrates.

Behavior: Even though Apteribis was flightless, it still had hooklets in its feathers - usually used to provide structure in flight, for Apteribis they would have provided strength against stress in the wind and water. As such, Apteribis probably still contended with fairly perilous environments, probing through the waves or wading in strong wind to find food. It also probably spent a good amount of time looking for food in the litter of the forest floor, being associated strongly with the rainforests of Hawai’i. It would have used that long beak for probing, and its still skinny legs to carefully wade through whatever it was walking across. Beyond that, the rest of its behavior is uncertain - without flight, it wouldn’t have moved around much; and it probably would have taken care of its young.

By José Carlos Cortés

Ecosystem: Hawai’i during the Ice Age was similar to Hawai’i today, just with some more arid conditions and different wildlife in general. Much like New Zealand, Hawai’i featured many kinds of unique birds, including Apteribis. There were also the Giant Hawaii Goose, a giant finch called the Giant Amakihi, the Giant Maui Crake, the High-Billed Crow, the Kaua’i Mole Duck, the Moa-Nalo, The Nēnē-nui, Stilt-Owls, and so many more.

Other: Apteribis did get quite big, but overall it wasn’t an example of island gigantism, just island flightlessness.

Species Differences: A. glenos lived primarily on the island of Molokai, while A. brevis was found more on Maui.

~ By Meig Dickson

Sources Under the Cut

Dove, C. J., S. L. Olson. 2011. Fossil Feathers from the Hawaiian Flightless Ibis (Apteribis sp.): Plumage Coloration and Systematics of a Prehistorically Extinct Bird. Journal of Paleontology 85 (5): 892 - 897.

Godino, F.M.J. (2011). "Maui Upland Apteribis". The Extinction Website. Retrieved 2011-01-07.

Olson, Storrs; James, Helen (1991). "Descriptions of Thirty-Two New Species of Birds from the Hawaiian Islands Part I. Non-Passeriformes". Ornithological Monographs. 7.

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a-dinosaur-a-day · 6 years ago

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Piscator tenuirostris

By Scott Reid

Etymology: Fisherman

First Described By: Harrison & Walker, 1976

Status: Extinct

Time and Place: Around 38 million years ago, in the Priabonian age of the Eocene of the Paleogene

Piscator is known from the Bracklesham Beds in Hampshire, England

Physical Description: Piscator is known from part of a jaw, which showcases that it was similar to modern Cormorants - a group of birds which dive for food in the ocean, where they are able to propel themselves with their feet enough to reach depths as much as 45 meters under water. They have short wings and, thus, have difficulty flying in an energy-efficient manner. However, given all we have of Piscator is a jaw, it’s uncertain how much Piscator resembled modern Cormorants - especially given how early it shows up in the fossil record. What we can tell from the jaw is that it was long and narrow, indicating it may have resembled in size and appearance the European Shag apart from having a more narrow bill.

Diet: Presumably, Piscator ate fish like living Cormorants.

Behavior: Without more fossil material of Piscator, it’s uncertain if it would have behaved like living cormorants; given how Limnofregalis is so different from living frigate birds, it’s probably unwise to make assumptions based on modern relatives. Still, it probably lived near the shore, and spent most of its time feeding on fish; it possibly also nested in roosts like its living relatives.

Ecosystem: Piscator lived in the Bracklesham Beds, a later-Eocene environment of England that was a rocky shoreline ecosystem. Little is known about this ecosystem except that it was populated with other dinosaurs, such as the bird of prey Milvoides, the rails Patipons and Parvirallus, and the pheasant Percolinus. Piscator probably, thus, had to look out for Milvoides in terms of dangers to its safety.

Other: Piscator is the earliest occurance of a cormorant-like thing in the fossil record; the next occurance of such an animal is in the Oligocene of Egypt.

~ By Meig Dickson

Sources under the Cut

Harrison, C. J. O., C. A. Walker. 1976. Birds of the British Upper Eocene. Zoological Journal of the Linnean Society 59: 323 - 351.

Mayr, G. 2009. Paleogene Fossil Birds. Springer-Verlag Berlin Heidelberg.

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a-dinosaur-a-day · 6 years ago

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Aphrodroma brevirostris

By John and Jemi Holmes

Etymology: Racer on the Sea Foam

First Described By: Olson, 2000

Status: Extant, Least Concern

Time and Place: Within the last 10,000 years, in the Holocene of the Quaternary

The Kerguelen Petrel is found along the Antarctic Ocean

Physical Description: The Kerguelen Petrel looks like other petrels, with a narrow body and long, thin wings for soaring above the water. This petrel is about 33 to 36 centimeters long, with wings up to 82 centimeters in length. It is a fairly uniformly grey bird, with a light grey belly and darker grey wings and tail. It has a small black beak, and black patches around the eyes. The sexes tend to look the same, though the males are larger; the juveniles also look similar to the adults.

Diet: These petrels primarily feed on squid, but also krill, fish, and cephalopods.

Behavior: The Kerguelen Petrel spends most of its time flying fast over the sea looking for food, often following cetaceans - especially orcas - around to get food welled up from the ocean. They often capture food at night, surface-seizing as well as dipping and plunging to grab their favorite treats. They will go very fast over the waves, also flying high, before diving fast to grab their food. Despite this, they are a very quiet bird, only calling wheezy calls while flying above breeding colonies.

By John Gerrard Keulemans, in the Public Domain

The Kerguelen Petrel begin breeding in August, with a major movement occuring in September to reach the breeding sight, and egg laying mainly occurs in October. They make huge egg laying colonies on islands in the Antarctic Ocean, though each pair is monogamous and makes one nest burrow. They make these nest burrows deep in the soil and line them with plants, where they lay one white egg. That egg is incubated for up to fifty days, first by males and then by females. The chicks are very brown and brooded with food from both parents. These birds then spend most of their lives moving around the water, traveling thousands of miles over a short time to reach sources of food.

Ecosystem: The Kerguelen Petrel mainly lives in cold, pelagic waters; they breed near the sea, and spend very little of their time on land.

Other: Despite being poorly known, the Kerguelen Petrel is not globally threatened with extinction, with millions of mated pairs alive today.

~ By Meig Dickson

Sources under the Cut

Carboneras, C., Jutglar, F. & Kirwan, G.M. (2019). Kerguelen Petrel (Aphrodroma brevirostris). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Jobling, J. A. 2010. The Helm Dictionary of Scientific Bird Names. Christopher Helm Publishing, A&C Black Publishers Ltd, London.

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a-dinosaur-a-day · 6 years ago

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Nipponia nippon

By Daniel in Blue, CC BY-SA 3.0

Etymology: Japanese Crested Ibis

First Described By: Reichenbach, 1850

Status: Extant, Endangered

Time and Place: Within the last 10,000 years, in the Holocene of the Quaternary

The Crested Ibis is known from isolated locations in China and Japan

Physical Description: The Crested Ibis, being an Ibis, has a long body, a long neck, long stilt legs, a small head, and a ridiculously long, curved crest, that are distinctive for this group. The Crested Ibis is distinct from other ibises by having a bushy crest on the back of its head, leading to its name. They have red heads, grey necks and backs, and white bellies. Their legs are red as well, while their beaks are dark black. They range from 55 to 84 centimeters in length, about the length of a golden retriever. The males and females do not look different from one another.

Diet: The Crested Ibis primarily feeds on small animals, especially fish, amphibians, and crustaceans, as well as a lot of eels.

Behavior: The Crested Ibis is mainly diurnal, utilizing the daylight hours to forage in small flocks in mud and shallow water. They use their bills to probe for food within the mud and water, and they’ll also go digging in grasses. Over fifty birds have been recorded foraging together.

This bird starts breeding in Late February through early March, with eggs laid from March through April. They form monogamous, breeding pairs, with both members of the couple working on making the nest, tending the eggs, and feeding the young. They lay their eggs in isolated nests, though back in the day they’d do so in colonies. They make their nests out of large, flimsy sticks that are lined with twigs, leaves, and hay. These nests are built in tree branches, usually very high up and very far away from humans, near where food can be found. They lay about 3 eggs, on average, with more eggs laid when more food is available. The chicks hatch after a month and are very fluffy and grey. They will fledge after about two months, and become independent nearer to three months. The parents feed the young by regurgitating into their mouths.

By Hisagi, CC BY-SA 3.0

These birds are not migratory, though they do move between breeding areas and feeding areas over twenty kilometers. They will disperse as family groups more and more south over time, but do not return north after moving. They make “aaa” calls, and rarely, making them fairly nonvocal birds.

Ecosystem: The Crested Ibis lives mainly in marshes, streams, rivers, ponds, lakes, rice fields, and the like, usually those found in valleys near large clumps of trees. Chicks are often fed on snakes, weasels, and martens, while the adults are more at risk from larger mammals.

Other: The Crested Ibis used to have a much larger range, but has steadily been declining in population due to habitat loss, small original population loss, limited range, winter starvation, and hunting. The species came to the brink of extinction, with only one population remaining in China. Since then, conservation efforts have been heavily ongoing both in and out of zoos, with the birds reintroduced into Japan in 2008. Eggs have been hatched in Japan and the conservation efforts seem to b e succeeding, but such a rapid drop in population will limit the gene pool of the species going forward in a bottleneck event.

~ By Meig Dickson

Sources under the Cut

Jobling, J. A. 2010. The Helm Dictionary of Scientific Bird Names. Christopher Helm Publishing, A&C Black Publishers Ltd, London.

Matheu, E., del Hoyo, J., Kirwan, G.M. & Garcia, E.F.J. (2019). Asian Crested Ibis (Nipponia nippon). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

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a-dinosaur-a-day · 6 years ago

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Limnofregata

By Ripley Cook

Etymology: Freshwater Frigatebird

First Described By: Olson, 1977

Referred Species: L. azygosternon, L. hasegawai, L. hutchisoni

Status: Extinct

Time and Place: Limnofregata is known from between 53.5 and 48.5 million years ago, in the Ypresian age of the Eocene of the Paleogene

Limnofregata has been found entirely within the Fossil Butte Member of the Green River Formation in Wyoming

Physical Description: Limnofregata is one of the earliest known examples of the Frigatebirds - a group of water-associated birds with a distinctive appearance. These birds have long bills for catching fish in the oceans and huge, distinctive pouches on their throats. They are able to soar for weeks on end, making them highly adapted for their water-journeying lifestyle. Limnofregata, being a very early example of the group, look like what you’d expect a transitional form of the frigatebirds to be - showcasing some of the same distinct shape of the modern group, while still not being quite there yet.

Limnofregata showed significant similarity to living Frigatebirds - like living members of the species it had short, stocky legs, stronger bones in the wings, and wide hips. This indicates that it was already on the path towards high levels of specialization for flight. However, its wings were not quite as long, in terms of proportion, as living Frigatebirds; this indicates that it didn’t utilize soaring as much in its life. Limnofregata also had a shorter bill and long, slitlike nose openings, more like modern boobies; it also lacked the noticeable hook found on modern Frigatebird bills. The size of the nostrils reduced in Frigatebirds as they transitioned to more saltwater habitats (aka, the open ocean), so the large nostril openings in Limnofregata point to its freshwater habitat. Limnofregata was also not sexually dimorphic in terms of size, an important characteristic of living Frigatebirds.

Limnofregata varied in size amongst the different species, but in general it had a wingspan of between 100 to 120 centimeters - in Imperial units, that’s between 3 and 4 feet long. This is a little more than half the length of living Frigatebird wingspans, but their bodies are roughly the same size as living Frigatebird, adding more evidence to their wings being less adapted for soaring.

By Scott Reid

Diet: Given their distinct difference in beak shape compared to modern Frigatebirds, and their completely different habitat (rather than being associated with the open ocean, Limnofregata lived near a lake; read more in the Ecosystem subsection), it is unlikely that it had a similar diet. Instead, Limnofregata was probably more of an opportunist, like modern gulls - feeding on a wide variety of food, of which fish was only one kind of many. As such, it was much more omnivorous than its living relatives.

Behavior: Limnofregata was heavily associated with a lake ecosystem, and, as something more analogous to living gulls, it would have been the asshole of that lake ecosystem. Rather than soaring about looking for sources of fish, like living Frigatebirds, it would have probably stayed close to the shore and the edge of the freshwater lakes in its environment, feeding on smaller vertebrates and harrassing other birds in the area for their food, attempting to grab the catches of other birds and eating their fish instead of catching the food themselves. As opportunists, they would have congregated especially frequently at moments of extensive food production, such as when large numbers of fish died off in the ecosystem as oxygen depleted in the lakes.

Given that the sexes were alike in size, it’s possible that they didn’t have as extensive systems of sexual display as living Frigatebirds do; though, of course, no throat pouches have been fossilized either way, so we can’t be certain. As large numbers of these birds have been fossilized together, it is likely that they formed large flocks of convenience, like modern gulls today.

By José Carlos Cortés

Ecosystem: The Green River Formation is another example of a well-documented ecosystem of the global rainforest of the early Eocene; in fact, it is older than the Messel Pit, and showcases unique creatures as a result. Similar to the Messel Pit, the Green River Formation is associated with a fossil lake system scattered amongst the jungle; however, given that the animals of Green River were not quite as small as those of the Messel Pit, the vegetation does not seem to have been quite as dense. The dominant tree type surrounding the lake were sycamore trees, though ferns, palms, and many other plant types were present as well. The entire system was greatly affected by changes in sediment as the Rocky Mountains formed around them. This commonly lead to great influxes of nutrients - like when industrial companies dump phosphorus into lakes today - overwhelming the lake system and suffocating the fish inside. This influx of sediment and minerals allowed for the ecosystem��s unique preservation; it also would have lead to periodic upwelling of dead fish for Limnofregata to munch on. These fish included animals such as rays, catfish, suckers, and relatives of modern herrings and sardines, along with many others. Crocodiles such as Borealosuchus were present, and probably would have fed upon Limnofregata. There were also some of the earliest primates, bats, and an armadillo-like mammal as well.

Of course, birds were extremely common, to the point of having feathers preserved in many cases. Other dinosaurs known from the Fossil Butte Member include the Lithornithids (flighted, tree-dwelling relatives of modern Ostriches and Emu) Pseudocrypturus and Calciavis; the flamingo-like duck Presbyornis; the pheasant relative Gallinuloides; the early swift and hummingbird relative Eocypselus; the frogmouth-like Fluvioviridavis and Prefica; the mousebird relative Anneavis; the early woodpecker relative Neanis; the Parrots of Prey Cyrilavis and Tynskya; and the early passerine relatives with parrot feet Zygodactylus and Eozygodactylus. Thus, the Green River Formation was another example of a great place to see how dinosaurs were getting on after the extinction.

Other: Feather impressions are known from Limnofregata, but they aren’t very exciting in terms of morphology.

Species Differences: Since all three species are from the same place, they are mainly distinguished from one another based on shape and size. L. hasegawai was much larger, about the size of the largest modern Frigatebirds; L. azygosternon was somewhat somewhat smaller and more comparable with the smaller species of the group today. L. hutchisoni differs in terms of how its wing bones are shaped, but was large like L. hasegawai, potentially even larger.

~ By Meig Dickson

Sources under the cut

Felice, R. N. 2014. Coevolution of caudal skeleton and tail feathers in birds. Journal of Morphology 275 (12): 1-10.

Grande, L., P. Bucheim. 1994. Palaeontological and Sedimentological Variation in Early Eocene Fossil Lake. Contributions to Geology, University of Wyoming 30: 45.

Hutchison, J. H. 2013. New turtles from the Paleogene of North America. In D. B. Brinkman, P. A. Holroyd, J. D. Gardner (eds.), Morphology and Evolution of Turtles 477-497

Mayr, G. 2009. Paleogene Fossil Birds. Springer-Verlag Berlin Heidelberg.

Mayr, G. 2017. Avian Evolution: The Fossil Record of Birds and its Paleobiological Significance. Topics in Paleobiology, Wiley Blackwell. West Sussex.

Olson, S. L. 1977. A Lower Eocene frigatebird from the Green River Formation of Wyoming (Pelecaniformes: Fregatidae). Smithsonian Contributions to Paleobiology 35:1-33

Olson, S. L., H. Matsuoka. 2005. New specimens of the early Eocene frigatebird Limnofregata (Pelecaniformes: Fregatidae), with the description of a new species. Zootaxa 1046: 1 - 15.

Orta, J. (2019). Frigatebirds (Fregatidae). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Smith, M. E., B. Singer, A. Carroll. 2003. 40Ar/39Ar Geochronology of the Eocene Green River Formation, Wyoming. Geological Society of America Bulletin 115 (5): 549 - 565. Stidham, T. A. 2014. A new species of Limnofregata (Pelecaniformes: Fregatidae) from the Early Eocene Wasatch Formation of Wyoming: implications for palaeoecology and palaeobiology. Palaeontology: 1 - 11.

123 notes · View notes

a-dinosaur-a-day · 6 years ago

Text

Cercibis oxycerca

By Francesco Veronesi, CC BY-SA 2.0

Etymology: Tailed Ibis

First Described By: Wagler, 1832

Status: Extant, Least Concern

Time and Place: Within the last 10,000 years, in the Holocene of the Quaternary

Cercibis is known primarily from wet lowlands and riverbanks in northern South America

Physical Description: Cercibis, the Sharp-Tailed Ibis, is a large, black wading bird with the distinctive long pointy snout of the Ibises. It is about 75 to 86 centimeters long, making it about the same length as a small Canada Goose. Their bodies are entirely black in color, and they have long brown legs, reddish faces, and beige beaks. The beaks are very long and downward pointed, like those of most ibises, with long slit-like nostrils extending from the top of the beak down. It has the longest tail of any ibis, which might be the source of its unusual name. The black feathers are tinted green in most locations, and purple on the back, hind neck, wings, and tail. Juveniles aren’t as shiny as the adults.

Diet: The Sharp-Tailed Ibis primarily feeds on small invertebrates, especially insects, earthworms, crustaceans, and snails. They’ve also been found eating small aquatic vertebrates such as amphibians. It is less aquatic than other Ibises in its feeding habits. It’s primary food source is, however, insects, above all other groups.

Behavior: The Sharp-Tailed Ibis forages primarily in small groups, or mated pairs, in open land and tall grass environments, sifting through shallow mud for insects, as well as along the edges of lagoons. They will occasionally forage for insects in shallow water, less than 3 centimeters deep. They walk quickly along the mud and probe deep into the ground looking for prey, using touch to find it in the ground. They don’t particularly mind the mud and can often be found with it dried along their bills. It is mostly active in the morning, unlike other ibises in the region with similar feeding habits.

By Miguel Jacques, in the Public Domain

The Sharp-Tailed Ibis does migrate some during the wet season, going to higher elevations to escape the flooding of their usual lowland grass habitat. These higher regions remain unflooded and, thus, filled with their preferred foraging areas. Other than that, though, they remain largely sedentary, not migrating over large distances for food. They fly extremely slowly, and low above the ground, only covering short distances. Sometimes they do fly over larger areas to reach roosting and feeding sites, but they are very loud fliers and easily spotted via hearing before they come into sight. They walk very slowly and carefully, and in general aren’t the fastest of animals.

The Sharp-Tailed Ibis is an extremely vocal bird, making loud trumpeting calls that are repeated extensively. While perched, they make similar but shorter calls, as well as quiet low grunts. They also make loud, drawn-out flight calls. The drumming sound of the calls lead to their common name in Spanish being Tarotaro.

This particular ibis breeds during the dry season, from August until February, which is very weird for an ibis as most breed during the wet season. They breed in forests in monogamous pairs, and egg laying occurs in August and September. The young will stay with their parents all the way through the end of the dry season. Courtship behavior isn’t known, but it seems that preening each other is a part of it, and they also preen their offspring.

Ecosystem: The Sharp-Tailed Ibis mainly lives in lowland wetland habitats as well as along lagoons and in tall grass environments. They do migrate a little back and forth from higher elevations to lower elevations depending on wetland flooding. They are primarily preyed upon by the Black-Collared Hawk, which will pursue these ibises over flooded marshes which often leads to the ibis actually moving fast for once.

Other: This ibis has never been kept in captivity, nor imported out of South America. Despite its smaller habitat, it is an extremely stable bird and does not seem to be in danger of extinction.

~ By Meig Dickson

Sources under the cut

Aguilera, E. 1988. La comunidad de ibises (Threskiornithidae) en los Llanos de Venezuela. Sociedad de Ciencias Naturales La Salle. 130.

Blake, E. R. 1977. Manual of Neotropical Birds. Vol. 1. University of Chicago Press, Chicago.

Byers, O., K. Brouwer, M. Coulter, U. S. Seal. 1995. Stork, Ibis, and Spoonbill Conservation Assignment Management Plan: Working Document. IUCN/SSC Conservation Breeding Specialist Group: Apple Valley, MN.

Frederick, P. C., K. L. Bildstein. 1992. Foraging ecology of seven species of Neotropical ibises (Threskiornithidae) during the dry season in the Llanos of Venezuela. The Wilson Bulletin 104: 1 - 21.

Kushlan, J. A., G. Morales, P. C. Frohring. 1985. Foraging niche relations of wading birds in tropical wet savannas. Ornithological Monographs 36: 663 - 682.

Jobling, J. A. 2010. The Helm Dictionary of Scientific Bird Names. Christopher Helm Publishing, A&C Black Publishers Ltd, London.

Luthin, C. S. 1983. Breeding ecology of Neotropical ibises in Venezuela and comments on captive propagation. Proceedings Jean Delacour/IFCB Symposium on Breeding Birds in Captivity. INternational Foundation for the Conservation of Birds, Hollywood, California.

Matheu, E., del Hoyo, J., Garcia, E.F.J. & Boesman, P. (2019). Sharp-tailed Ibis (Cercibis oxycerca). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Morton, E. S. 1979. A comparative survey of avian social systems in northern Venezuelan habitats. Pgs. 233 - 259 in Eisenberg, J. F. Vertebrate Ecology of the Northern Neotropics. Smithsonian Institution Press, Washington D. C.

Ogden, J. C., B. T. Thomas. 1985. A colonial wading bird survey in the central Llanos of Venezuela. Colonial Waterbirds 8: 23 - 31.

Schönwetter, M. 1967. Handbuch der Oologie (W. Meise, ed.) Band I. Akademie - Verlag, Berlin.

Thomas, B. T. 1979. The birds of a ranch in the Venezuelan Llanos. Pgs. 213 - 232 in Eisenberg, J. F. Vertebrate Ecology of the Northern Neotropics. Smithsonian Institution Press, Washington D. C.

Van Perlo, B. 2009. A Field Guide to the Birds of Brazil. OUP USA, First Edition.

83 notes · View notes

a-dinosaur-a-day · 6 years ago

Text

Thalassoica antarctica

By Joshua Stone, CC BY-SA 4.0

Etymology: Inhabiting the sea

First Described By: Reichenbach, 1853

Status: Extant, Least Concern

Time and Place: Thalassoica, the Antarctic Petrel, is only known from the Holocene Epoch, so in the last 12,000 years, through today - though fossils of this animal are known.

The Antarctic Petrel is known from the Antarctic ocean, and it mainly spends its land time on Antarctica itself.

Physical Description: The Antarctic Petrel is a distinctively colored seabird, with a dark grey body and dramatically white wing and tail feathers. These wings are long and thin, good for soaring over the sea. It has a fairly small body and head, with a short bill, and short tail feathers. The Antarctic Petrel ranges from 40 to 46 centimeters in body length, but the wingspan is up to 110 centimeters - nearly three times the length of its body. In general it is an extremely distinctive bird, especially in the air. From underneath, it looks mainly white, with a brownish head.

Diet: The Antarctic Petrel mainly feeds on krill, but also fish, squid, crustacean, and jellyfish, with fish and krill making up the bulk of its diet.

Behavior: Antarctic Petrels spend most of their time in the air, soaring around and searching for food on the ocean, rarely returning to land. They’ll go to the surface and seize food from there, and also plunge into the water and dip for food as well. They often dive into the water to grab more food, especially food stirred up by baleen whales and other seabirds such as the Arctic Tern. Thousands of birds will often flock together, up to 6000, in one area with a significant amount of food. They stick primarily to open water near pack ice, and land almost only during the breeding season. It is possible that they migrate from feeding areas as well, but their movements are quite unknown. This is a fairly silent species at sea, though at the nests they make loud “kook-kook” calls for sexual and angry displays.

By Joshua Stone, CC BY-SA 4.0

The Antarctic Petrel begins returning to the breeding colony in mid spring, and starts breeding at the end of spring in November. They all lay eggs synchronized together, literally starting between the 18th and 23rd of November and laying eggs for the next two weeks. The birds make monogamous, long term (potentially even lifelong) pair bonds, though they do cheat on each other from time to time. They stay awake mainly during the day, living together in colonies of up to a million birds with nests more than one meter apart. They make their nests on cliff ledges and in hollows, or level to the ground, out of pebbles, bones, and feathers. They lay one white egg, which is incubated in shifts between the two parents. The chicks are pale grey and fluffy, and are fed regularly by the parents as they go out and gather food for the chick. The eggs are completely cared for by the parents until the end of the summer, when the chicks fly away and start fending for themselves. About half of the chicks survive to this point.

Ecosystem: These birds live primarily in the open sea, though they’ll land on the Antarctic rocky coast during the breeding season. They try to stay to snow-free cliffs, and away from pack ice water. Their eggs and young are mainly preyed upon by South Pole Skuas.

By Nigel Voaden, CC BY-SA 2.0

Other: Millions of Antarctic Petrels are known to live, so they’re not considered to be threatened with extinction, though of course the changes to the Antarctic ecosystem will affect this bird, and krill fisheries have also had an impact on its population.

~ By Meig Dickson

Sources under the cut

Carboneras, C., Jutglar, F. & Kirwan, G.M. (2019). Antarctic Petrel (Thalassoica antarctica). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.

Jobling, J. A. 2010. The Helm Dictionary of Scientific Bird Names. Christopher Helm Publishing, A&C Black Publishers Ltd, London.

Schmolcke, U. 2008. Holocene environmental changes and the seal (Phocidae) fauna of the Baltic Sea: coming, going and staying. Mammal Review 38(4):231-246

54 notes · View notes

a-dinosaur-a-day · 7 years ago

Note

Is there a list of previous years' DMM contestants somewhere, so we can see which dinosaurs can't be campaigned for?

Imma just. Write it up here.

Note: All species of a particular genus are ineligible unless the entry is listed by the specific species that was in the competition. Common names are listed where applicable.

INELIGIBLE DINOSAURS, BY CATEGORY FOR #DMM2018, LISTED UNDER THEIR GENUS

DROMAEOSAURS

DeinonychusUtahraptorMicroraptorVelociraptorDakotaraptor

ENANTIORNITHES

Avisaurus

MISC. TETANURANS

Cryolophosaurus

BASAL THEROPODS

DilophosaurusCoelophysis

ALVAREZSAURS & THERIZINOSAURS

TherizinosaurusShuvuuiaMononykusNothronychus

ORNITHOMIMOSAURS

DeinocheirusGallimimus

TYRANNOSAUROIDS

TyrannosaurusYutyrannus

BASAL CERATOSAURS

N O N E

CARNOSAURS

AllosaurusCarcharodontosaurus

BASAL COELUROSAURS

SinosauropteryxCompsognathus

BASAL AVIALAE

ArchaeopteryxBalaurConfuciusornis

ABELISAURIDS

CarnotaurusMajungasaurus

OVIRAPTOROSAURS

CitipatiAnzu

MEGALOSAURS

BaryonyxSpinosaurus

EUORNITHES

Hesperornis

BASAL PARAVIANS

TroodonYi

FLAGELLICAUDATANS

AmargasaurusBrontosaurusDiplodocusBrachytrachelopanApatosaurus

BASAL SOMPHOSPONDYLIANS

Sauroposeidon

BASAL DINOSAURS

EoraptorHerrerasaurus

BASAL SAUROPODOMORPHS/PROSAUROPODS

PantydracoThecodontosaurusBuriolestes

BASAL TITANOSAURIFORMES

GiraffatitanBrachiosaurus

BASAL PLATEOSAURS

MassospondylusPlateosaurus

MAMENCHISAURS & TURIASAURS

MamenchisaurusOmeisaurusZby

BASAL MACRONARIANS

CamarasaurusBellusaurus

AMERICAN TITANOSAURS

SaltasaurusArgentinosaurusPuertasaurusDreadnoughtusAlamosaurus

BASAL SAUROPODIFORMES

JingshanosaurusAardonyx

MISCELLANEOUS TITANOSAURS

N O N E

BASAL GRAVISAURS

ShunosaurusVulcanodon

BASAL DIPLODOCOIDS

NigersaurusRebbachisaurus

ASIAN TITANOSAURS

N O N E

BASAL SAUROPODS

N O N E

BASAL DINOSAUROMORPHS

N O N E

CHASMOSAURINES

TriceratopsChasmosaurus

BASAL HADROSAURIFORMES

IguanodonOuranosaurus

BASAL NEORNITHISCHIANS

HypsilophodonKulindadromeusLeaellynasauraOthnielia

SAUROLOPHINES

EdmontosaurusMaiasaura

LEPTOCERATOPSIDS & BASAL CORNOSAURIANS

Protoceratops

LAMBEOSAURINES

ParasaurolophusLambeosaurusCorythosaurus

BASAL IGUANODONTIANS

MuttaburrasaurusDryosaurus

BASAL ORNITHISCHIANS

HeterodontosaurusScutellosaurusTianyulong

DERIVED NODOSAURS

EdmontoniaSauropelta

CENTROSAURINES

StyracosaurusPachyrhinosaurus

BASAL NODOSAURS

N O N E

ANKYLOSAURIDS

AnkylosaurusMinmi

BASAL CERATOPSIANS

PsittacosaurusYinlong

PACHYCEPHALOSAURS

PachycephalosaurusStegoceras

BASAL ANKYLOPOLLEXIANS

Draconyx

STEGOSAURS

KentrosaurusStegosaurus

ACCIPITROMORPHS & OPISTHOCOMIFORMES

Gypaetus (Bearded Vulture) Sagittarius (Secretary Bird) Opisthocomus (Hoatzin) Harpia (Harpy Eagle)

PASSERIDANS

Parus (Great Tit & other members of Parus)

NON-PICIFORM CORACIIMORPHS

Dacelo (Blue-Winged Kookaburra & other members of Dacelo) Pharomachrus (Resplendent Quetzal & other members of Pharomachrus) Upupa (Hoopoes)

STRISORES

Nyctibius (Common Potoo & other members of Nyctibius) Mellisuga (Bee Hummingbird & other members of Mellisuga) Podargus (Tawny Frogmouth & other members of Podargus)

GALLOANSERANS

Gallus (Chicken & other members of Gallus) Pavo (Indian Peafowl & other members of Pavo) Gastornis

ARDEAENS

Balaeniceps (Shoebill) Eudyptula (Little Blue Penguin & other members of Eudyptula)

SUBOSCIENS

N O N E

PALAEOGNATHS

Struthio (Ostriches) Casuarius (Cassowaries) Apteryx (Kiwi)

MIRANDORNITHES & CHARADRIIFORMES

Pinguinus (Great Auk)

CORVIDANS

Corvus (Common Raven & other members of Corvus) Cyanocitta (Blue Jay & other members of Cyanocitta)

PICIFORMES

N O N E

OWLS

Tyto (Barn Owl & other members of Tyto) Athene (Burrowing Owl & other members of Athene)

COLUMBAVES

Columba (Rock Dove/Pigeon & other members of Columba) Raphus (Dodo)

PARROTS

Strigops (Kakapo)Psittacus (African Grey Parrot & other members of Psittacus)

GRUIFORMES

Grus (Whooping Crane & other members of Grus)

CARIAMIFORMES & FALCONS

Falco peregrinus (Peregrine Falcon)TitanisPhorusrhacos

#dmm2018 #dinosaur march madness #palaeoblr #dinosaurs #birds #birblr #dmm #therechercherambler

94 notes · View notes