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bestanimal · 1 month ago

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Round 3 - Mammalia - Primates

(Sources - 1, 2, 3, 4)

Our next and last group of Euarchonta is the order Primates. This diverse order includes the families Cheirogaleidae (“mouse lemurs”), Daubentoniidae (“Aye-aye”), Indriidae (“indriid lemurs”), Lemuridae (“lemurid lemurs”), Lepilemuridae (“sportive lemurs”), Galagidae (“galagos” or “bush babies”), Lorisidae (“lorises”, “pottos”, and “angwantibos”), Cercopithecidae (“old world monkeys”), Hylobatidae (“gibbons”), Hominidae (“great apes”), Callitrichidae (“marmosets” and “tamarins”), Cebidae (“capuchins” and “squirrel monkeys”), Aotidae (“night/owl monkeys”), Pitheciidae (“titis”, “saki monkeys”, and “uakaris”), Atelidae (“spider monkeys”, “howler monkeys”, and “woolly monkeys”) and Tarsiidae (“tarsiers”).

Many primate characteristics represent adaptations to an arboreal environment, including large brain sizes, binocular vision, color vision, vocalizations, shoulder girdles allowing a large degree of movement in the upper limbs, and opposable thumbs (in most but not all) that enable better grasping and dexterity. Their large brains (relative to body size) compared to other mammals, as well as an increased reliance on visual acuity, has been an evolutionary trade-off at the expense of their sense of smell (the dominant sensory system of most mammals). Most primates are arboreal, but some primates, including gorillas, humans, and baboons, are primarily ground-dwelling, though all species retain adaptations for climbing trees. Arboreal locomotion techniques include leaping from tree to tree or swinging between branches of trees (brachiation); terrestrial locomotion techniques include walking on two hindlimbs (bipedalism) or modified walking on four limbs (quadrupedalism) via knuckle-walking. They are the most cognitively advanced animals, capable of using tools. Primates may communicate using facial and hand gestures, smells, and vocalizations, with humans (genus Homo) creating complex languages and sophisticated civilizations.

Primates are among the most social of all animals, forming pairs or family groups, uni-male harems, and multi-male/multi-female groups. Primates have slower rates of development than other similarly sized mammals, reach maturity later, and have longer lifespans. Females give birth to 1-2 young at a time. In some species, male primates take part in raising young, an oddity for mammals.

Primates arose in the Early Paleocene, about 65.9 million years ago. The earliest possible primate/proto-primate may be Purgatorius, which dates back to the Early Paleocene of North America. The oldest known true primates from the fossil record date to the Late Paleocene of Africa, around 57 mya (Altiatlasius) or the Paleocene-Eocene transition in the northern continents, around 55 mya (Cantius, Donrussellia, Altanius, Plesiadapisand, Teilhardina). The suborder Strepsirrhini, which includes the lemurs, lorisids, and galagos, is generally thought to have split off from the primitive primate line about 63 mya, and evolved independently from monkeys.

Propaganda under the cut:

The smallest primate in the world is the critically endangered Madame Berthe's Mouse Lemur (Microcebus berthae), with an average body length of 9.2 cm (3.6 in) and seasonal weight around 30 g (1.1 oz).

One of the largest primates in the world is the critically endangered Eastern Gorilla (Gorilla beringei) (image 4). Males are much larger than females. A full-grown male Eastern Gorilla typically weighs 140–205.5 kg (309–453 lb) and stands 1.7 m (5.6 ft) upright and a female typically weighs 90–100 kg (200–220 lb) and stands 1.5 m (4.9 ft) tall. Some Humans (Homo sapiens) have surpassed this size, but it is not the average for Humans, for which the average adult male stands about 171 cm (5.7 ft) tall and weighs 77 kg (170 lb), while the average height for adult Human females is about 159 cm (5.3 ft) and average weight is 59 kg (130 lb).

All lemurs (superfamily Lemuroidea) are native only to the African island of Madagascar, and evolved independently from other primates on the island. The International Union for Conservation of Nature (IUCN) considers lemurs to be the world's most endangered group of mammals, noting that as of 2013 up to 90% of all lemur species face the threat of extinction in the wild within the next 20 to 25 years.

As many lemurs eat nectar as a part of their diet, and catch pollen in their fur in the process, they are considered to be some of the largest pollinators in the world. The endangered Hairy-eared Dwarf Lemur (Allocebus trichotis) has an extraordinarily long tongue. This is thought to be an adaptation for drinking nectar and tree sap. The vulnerable Red-bellied Lemur (Eulemur rubriventer) has a feathered tongue, also a likely adaptation for feeding on nectar.

The Golden Bamboo Lemur (Hapalemur aureus) eats Giant Bamboo (Cathariostachys madagascariensis), which contains high levels of cyanide. The Golden Bamboo Lemur can consume twelve times the typically lethal dose of cyanide for most mammals on a daily basis. The physiological mechanisms that protect it from cyanide poisoning are unknown.

The Aye-aye (Daubentonia madagascariensis) has evolved some insect and seed-eating traits that are unique among primates, making it stand out among the lemurs. Such traits include continuously growing rodent-like front teeth for gnawing through wood and hard seeds, a highly mobile filiform middle finger for extracting food from tiny holes, large bat-like ears for detecting hollow spaces within trees, and use of self-generated acoustical cues to forage.

Many lemur species, including the Ring-tailed Lemur (Lemur catta), Milne-Edwards' Sifaka (Propithecus edwardsi), and the Verreaux's Sifaka (Propithecus verreauxi), live in groups led by a dominant female. Lemurs are one of the very few mammal groups where females are usually dominant over males.

Some lemurs, such as the Verreaux's Sifaka, live in the spiny forests of Southern Madagascar. Sifakas travel via leaping rapidly from tree trunk to tree trunk, an ability referred to as "ricochetal leaping". It is unknown how the Verreaux's Sifaka manages to do this characteristic leaping without impaling themselves on the long thorns of the spiny forests’ trees.

The extinct Giant Sloth Lemur, Archaeoindris fontoynontii, was comparable to a gorilla in size. It was rare, but still living when humans first arrived on Madagascar. Its large size and terrestrial habits would have made it vulnerable to hunting and habitat loss.

It was previously thought that all lorisids moved slowly, but this is not the case. Lorisids freeze in place as a defense tactic, or move slowly if they see or hear a potential predator. This only works in their leafy environment, and is a form of camouflage. Many lorisids are actually quite agile when not afraid.

Slow Lorises (genus Nycticebus) (image 3) from southeast Asia produce a secretion from their brachial gland, that is licked and mixed with their saliva to form a toxin which can be used for defense. This toxic bite is a rare trait among mammals, and unique among primates. The Slender Lorises (genus Loris) from Sri Lanka and South India also possess these brachial glands, but it is uncertain whether they also synthesize the toxin.

The Gelada (Theropithecus gelada) has a diverse repertoire of vocalizations thought to be almost as complex as that of humans.

The Allen's Swamp Monkey (Allenopithecus nigroviridis) has adaptations for a partially aquatic environment, including slight webbing of its fingers and toes.

The Common Patas Monkey (Erythrocebus patas) is the fastest runner among the primates, reaching speeds of 55 km/h (34 mph). For reference the fastest human, Usain Bolt, reached 37.58 km/h (23.35 mph) during his world record sprint.

The terrestrial guenons (genus Allochrocebus) live in fairly small groups dominated by females, with only a single adult male. The females are usually related, while the male stays only a couple of weeks or at most a couple of years, working as a watchdog and breeder.

Around dawn and dusk, dominant male Campbell's Mona Monkeys (Cercopithecus campbelli) will climb up to a perch and issue a series of booming calls. The sound carries for at least a kilometre, and other males join in. Campbell's Mona Monkeys often associate with monkeys of other species and engage in inter-species territorial calling which obey certain ritual rules. This is one of the more advanced forms of animal communication, with a rudimentary syntax.

Male Crested Mona Monkeys (Cercopithecus pogonias) will sometimes join groups of unrelated monkey, such as the Black Colobus (Colobus satanas). These otherwise solitary males can form strong group bonds with the non conspecific monkeys, possibly resulting in a permanent loss of mating opportunities.

The Northern Plains Gray Langur (Semnopithecus entellus) has a symbiotic relationship with the Chital (Axis axis), and the two species are rarely found apart. Both the langur and the deer know each other’s warning calls, and benefit from both groups watching for predators in the trees and on the ground.

Nearly all (73–100%) captive Rhesus Macaques (Macaca mulatta) are carriers of the herpes B virus. This virus is harmless to macaques, but infections of humans, while rare, are potentially fatal

The endangered Crab-eating Macaque (Macaca fascicularis) is the only old world monkey known to use stone tools in their daily foraging, and they engage in robbing and bartering behavior in some tourist locations.

Dusky Leaf Monkeys (Trachypithecus obscurus), Crab-eating Macaques, and White-thighed Surilis (Presbytis siamensis), form tolerant foraging parties, with juveniles playing together.

The critically endangered Celebes Crested Macaque (Macaca nigra) unknowingly found itself at the center of controversy between 2011 and 2018, when British wildlife photographer David J. Slater set up equipment that would allow the macaques to take “selfies.” People for the Ethical Treatment of Animals (PETA) argued that Slater could not hold a copyright claim over the “monkey selfie” that resulted, as it had been taken by a macaque and not him. This resulted in the United States Copyright Office stating that works created by a non-human, such as a photograph taken by a monkey, are not copyrightable. Slater lost income and took a blow to his reputation as a wildlife photographer as a result of the dispute. In a separate dispute, PETA tried to use the monkey selfies to establish a legal precedent that animals should be declared copyright holders, requesting that the copyright be assigned to the macaque, who they decided was named “Naruto”, and that PETA be appointed to administer proceeds from the photos for the endangered species' benefit. In dismissing PETA's case, a federal district court ruled that a monkey cannot own copyright under US law. PETA appealed. In September 2017, PETA and Slater agreed to a settlement in which Slater would donate a portion of future revenues on the photographs to wildlife organizations, but the court did not accept the settlement. In April 2018, the appeals court ruled against PETA, stating in its judgement that animals cannot legally hold copyrights and expressing concern that PETA's motivations had been to promote their own interests rather than to protect the legal rights of the monkeys. The ordeal left Slater with very little funding, and he lost his motivation and passion for photography. However, he was still glad for the impact the photos had on people, stating "It has taken six years for my original intention to come true which was to highlight the plight of the monkeys and bring it to the world. No one had heard of these monkeys six years ago, they were down to the last thousands. ... The locals used to roast them, but now they love them, they call it the 'selfie monkey'. Tourists are now visiting and people see there is a longer-term benefit to the community than just shooting a monkey."

In Ancient Egyptian mythology, Babi was the deification of the Hamadryas Baboon (Papio hamadryas) and was therefore a sacred animal. They were known as attendants of Thoth, and are thus also called the Sacred Baboon.

Critically endangered Red-shanked Doucs (Pygathrix nemaeus) eat peacefully with each other, and have been known to share their food with others. They may even break pieces of foliage off and hand them to each other, a type of active generosity that is rare among Old World monkeys.

Humans, Baboons, Bonobos (Pan paniscus), and Chimpanzees (Pan troglodytes) are omnivorous hunters, and will set off on hunting parties, sometimes bringing down smaller monkey species.

Both Chimpanzees and Humans are known to wage wars over territories and resources.

Orangutans build nests for both day and night use. Nests may be elaborate and involve a foundation and mattress made by intertwining leaves and branches and adding broken leafy branches. Additional features such as shade, a waterproof roof, "pillow", and "blanket", all of which are made from branches, twigs and leaves, may also be added.

Critically endangered Bornean Orangutans (Pongo pygmaeus) have been observed using tools such as using leaves as toilet paper, a pad of leaves as a plate for holding spiny durian fruit, a leafy branch for a bee swatter, a bunch of leafy branches held together as an "umbrella" while traveling in the rain, a single stick as a backscratcher, a branch or tree trunk as a missile, and have even been sighted using spears to attempt (unsuccessfully) to catch fish.

The critically endangered Sumatran Orangutan (Pongo abelii) has been observed using a different arsenal of tools. One may break off a tree branch that is about a foot long, snap off the twigs and fray one end with its teeth. The orangutan will then use the stick to dig in tree holes for termites. They will also use the stick to poke a bee's nest wall, move it around and catch the honey. In addition, orangutans use tools to eat fruit. When the fruit of the Neesia tree ripens, its hard, ridged husk softens until it falls open. Inside are seeds that the orangutans enjoy eating, but they are surrounded by fiberglass-like hairs that are painful if eaten. A Neesia-eating orangutan will select a five-inch stick, strip off its bark, and then carefully collect the hairs with it. Once the fruit is safe, the ape will eat the seeds using the stick or its fingers. Tools are created differently for different uses. Sticks are often made longer or shorter depending on whether they will be used for insects or fruits. If a particular tool proves useful, the orangutan will often save it. Over time, they can collect entire "toolboxes".

Endangered Bonobos (Pan paniscus) are capable of altruism, compassion, empathy, kindness, patience, and sensitivity. They are known for living in matriarchal societies, having more fluid sexuality, and settling disputes with sex rather than violence.

In a study published in February 2025, scientists determined that Bonobos could tell when a Human didn't know something, and point them in the right direction.

The endangered Siamang (Symphalangus syndactylus) has a large gular sac (throat pouch) that can be inflated to the size of the gibbon’s head, allowing it to make resonating calls. Mated pairs produce loud, well-patterned calling bouts, which are referred to as duetting. These calls advertise the presence and status of a mated pair. Newly formed pairs spend more time singing than an established pair.

The critically endangered Hainan Black-crested Gibbon (Nomascus hainanus) is one of the most endangered animals in the world. The most recent count found 22 Hainan Gibbons split between two families, one family of 11 and one of 7 members, with 4 loners, all residing in Bawangling National Nature Reserve on Hainan Island. Over 25% of the Hainan Gibbon’s habitat has been reduced due to illegal pulp paper plantation growers. As there are no Hainan Gibbons in captivity, the entire population could be one major storm or epidemic away from extinction.

Tarsiers are the only entirely carnivorous living primates.

Philippine Tarsiers (Carlito syrichta) are capable of hearing frequencies as high as 91 kHz. They are also capable of vocalizations with a dominant frequency of 70 kHz.

Unlike other male primates, male Callitrichids generally provide as much parental care as females. Parental duties may include carrying, protecting, feeding, comforting, and even engaging in play behavior with the babies in a group. In some cases, such as in the Cotton-top Tamarin (Saguinus oedipus), males, particularly fathers, even show a greater involvement in caregiving than females.

White-fronted Capuchins (genus Cebus) have been observed using leaves as a cup to drink water.

Female Squirrel Monkeys (genus Saimiri) have pseudo-penises, which they use to display dominance over smaller monkeys.

White-faced Sakis (Pithecia pithecia) often mate for life, and are very devoted to their partners, strengthening their bond by grooming each other.

Atelid monkeys are most famous for their long, extremely prehensile tails. Their tails have sensitive, almost hairless, tactile pads on their undersides, and can function as a “fifth limb” while moving through the trees.

About 60% of primate species are threatened with extinction. Common threats include deforestation, forest fragmentation, monkey drives, and hunting for use in medicines, as pets, and for food. Large-scale tropical forest clearing for agriculture most threatens primates, as well as farming for palm oil.

#I know it’s tempting to downvote because humans are in here and most of us are probably of the ‘I like animals more than people’ persuasion #(though I’m here to remind you that humans are animals)#but please remember that you’re voting for your favorite animal within the group not the group as a whole #I don’t know how many times I’ll have to reword these polls to make that clear but Please #Animal Polls #Round 3 #Mammalia

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