#Gavia pacifica

[birdblues]

Pacific Loon

[ifelten]

Stillehavslom (Gavia pacifica), 1K

Pacific Loon (Gavia pacifica), 1CY

[herpsandbirds]

Pacific Loons (Gavia pacifica), family Gaviidae, order Gaviiformes, South-central Alaska, USA

photograph by Choy Mears

[tinyshe]

Pacific loon or Pacific diver (Gavia pacifica)

シロエリオオハム（Pacific Diver）

羽が乾いたらふっくら

[lightningspam-photography]

Pacific Loon (Gavia pacifica)

taken in Newport Beach, California

status: Least Concern

These birds are a bit rarer to see as they only occur along a thin strip of the west coast and during their non-breeding season. This one here is in its non breeding plumage which makes it difficult to identify (and makes it look similar to another loon species that can be seen in the area).

[avianeurope]

Pacific Loon (Gavia pacifica) >>by Jeff Dyck

[pgmnhcollection]

Pacific loon (Gavia pacifica)

Live-mount by Charles Anderson

To help support the preservation of our collection click here.

[comparativetarot]

The Moon. Art by Brendan Marnell, from the Pacific Northwest Tarot.

Intuition, illusion, dreams, vagueness, instability, deception, anxiety, fear, misconception, insecurity. Duality.

Pacific loon / Gavia pacifica

The Kickstarter for this deck is currently active.

[typhlonectes]

Pacific Loon (Gavia pacifica), Alaska

photograph by Lisa Hupp/U.S. Fish and Wildlife Service

[a-dinosaur-a-day]

Gavia

Common Loon by Amy Widenhofer, CC BY-SA 2.0 

Etymology: Unidentified Sea Bird

First Described By: Coues, 1903

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, Gaviiformes, Gaviidae

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 

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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.

Broughton, J. M. 2004. Prehistoric human impacts on California birds: evidence from the Emeryville shellmoumd avifauna. Ornithological Monographs 56:1-90

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

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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.

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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

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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

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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

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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

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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.

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Piper, W.H.; Walcott, C.; Mager, J.N.; Perala, M.; Tischler, K.B.; Harrington, Erin; Turcotte, A.J.; Schwabenlander M. & Banfield, N. (2006). "Prospecting in a Solitary Breeder: Chick Production Elicits Territorial Intrusions in Common Loons". Behavioral Ecology. 17 (6): 881–888.

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[birdblues]

Pacific Loon

[herpsandbirds]

Pacific Loon (Gavia pacifica), family Gaviidae, order Gaviiformes, Utqiaġvik, North Slope, Alaska

photograph by Tyler Ficker

[avidbirder]

Bird-a-thon 2017 Recap

We few, we happy few, we band of birders.

On the 20th, I had the pleasure of spending 22 hours on the road with the Maine Audubon, completing the biggest “big day” of my life so far. Our team was “The Kylo Wrens” because birding+sleep deprivation=Star Wars-themed bird puns. We identified 146 species of birds, beating the other team by 9 species.

My plans of keeping detailed notes throughout the day were thwarted by the simple task of keep our species count list updated, so the minute details of the day are lost to time. Here’s a quick recap of what I can remember though.

Starting off at 12:00am standing less than three feet from a loudly clacking King Rail that despite our best efforts (and Seth’s night vision goggles) we weren’t able to actually spot. We literally witnessed the grass moving as the rail picked it’s way through, yet weren’t able to spot a single feather of the bird itself. Rails are cool.

Dipping on an Eastern Screech Owl and being mystified by some dubious mammal screeching in the distance.

Gas station Woodcock peent in Farmington.

The boreal forest along Boy Scout Rd in Rangely is cold at dawn. It’s also filled with some great warblers too.

Lena is extremely good at mimicking bird calls.

Seth spotted the same Barred Owl twice, two hours apart, but none of us managed to see it either time.

Day’s Store in Belgrade is one of the best general stores in the history of mankind. It’s got everything.

Never being more excited to be looking at a sandpit than when I discovered there could be Bank Swallows nesting in them.

Sleepy raccoon in the trees at Capisic Pond Park in Portland.

Quick detour when Doug thinks he spotted a White-winged Dove. Our schedule prevents us from picking apart every bush in the nearby area.

Literally hundreds of feeding terns and flying scoters along the rocks at Biddeford Pool, all lit up brilliantly by the setting sun.

Dipping on a Mute Swan but coming up with a Pacific Loon instead.

18 hours in and no one’s seen a damn Hairy Woodpecker.

The almost inaudible chirping of Grasshopper Sparrows at Kennebunk Plains.

Ending the day talking birding stories and eating homemade guac while listening to Whip-poor-wills calling all around us.

Finally turning up two hooting Barred Owls and deciding to call it a night.

For those of you who are just really into lists, here’s one of all the Life List species that this novice birder ticked off on the trip (in reverse order):

Eastern Whip-poor-will - Antrostomus vociferus

Upland Sandpiper - Bartramia longicauda

Grasshopper Sparrow - Ammodramus savannarum

Vesper Sparrow - Pooecetes gramineus

Eastern Meadowlark - Sturnella magna

Pacific Loon - Gavia pacifica

Roseate Tern - Sterna dougallii

Red Knot - Calidris canutus

Short-billed Dowitcher - Limnodromus griseus

Willow Flycatcher - Empidonax traillii

Black Tern - Chlidonias niger

Bank Swallow - Riparia riparia

Tennessee Warbler - Oreothlypis peregrina

King Rail - Rallus elegans

It was an eye-opening trip for me and a privilege to spend time with such great birders. Thanks for everything Doug, Lena, and Seth. I have gained an appreciation for how learning habitat is the gateway to more productive birding. Hopefully I can use that down the road.

[thalassarche]

Pacific Loon (Gavia pacifica) - photo by Matthew Studebaker

[ryandrawsbirds]

Pacific Loon, Gavia pacifica. September 6, 2017.

[ridiculousbirdfaces]

A Very Alien Looking Pacific Loon With Glowing Red Eyes by Gary Lackie Pacific Loon (Gavia pacifica)