Portal:Primates
The Primates Portal A primate is a member of the biological order Primates, the group that contains lemurs, the aye-aye, lorisids, galagos, tarsiers, monkeys, and apes, with the last category including great apes. With the exception of humans, who inhabit every continent on Earth, most primates live in tropical or subtropical regions of the Americas, Africa and Asia. Primates range in size from the 30-gram (1 oz) pygmy mouse lemur to the 200-kilogram (440 lb) mountain gorilla. According to fossil evidence, the primitive ancestors of primates may have existed in the late Cretaceous period around 65 mya (million years ago), and the oldest known primate is the Late Paleocene Plesiadapis, c. 55–58 mya. Molecular clock studies suggest that the primate branch may be even older, originating in the mid-Cretaceous period around 85 mya. Primates exhibit a wide range of characteristics. Some primates do not live primarily in trees, but all species possess adaptations for climbing trees. Locomotion techniques used include leaping from tree to tree, walking on two or four limbs, knuckle-walking, and swinging between branches of trees (known as brachiation). Primates are characterized by their large brains relative to other mammals. These features are most significant in monkeys and apes, and noticeably less so in lorises and lemurs. Many species are sexually dimorphic, which means males and females have different physical traits, including body mass, canine tooth size, and coloration.
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Orangutans are the most arboreal great apes and spend most of their time in trees. Their hair is typically reddish-brown, instead of the brown or black hair typical of chimpanzees and gorillas. Males and females differ in size and appearance. Dominant adult males have distinctive cheek pads and produce long calls that attract females and intimidate rivals. Younger males do not have these characteristics and resemble adult females. Orangutans are the most solitary of the great apes, with social bonds occurring primarily between mothers and their dependent offspring, who stay together for the first two years. Fruit is the most important component of an orangutan's diet, however, the apes will also eat vegetation, bark, honey, insects and even bird eggs. They can live over 30 years. Orangutans are among the most intelligent primates and use a variety of sophisticated tools, also constructing elaborate sleeping nests each night from branches and foliage. Both orangutan species are considered to be Endangered with the Sumatran orangutan being Critically Endangered. Threats to wild orangutan populations include poaching, habitat destruction and the illegal pet trade. Selected picture.jpg) The brown spider monkey, Ateles hybridus, is a species of spider monkey, a type of New World monkey, from South America. It is found in Colombia and Venezuela. Like all spider monkeys, it has very long, spindly limbs and a lengthy prehensile tail which can almost be called a fifth limb. The tail is made up of highly flexible, hairless tips with skin grooves which improves grip on tree branches and is adapted to its strictly arboreal lifestyle. It is currently critically endangered, with few examples of them remaining in the wild. CategoriesSelected species  Least Concern (IUCN 3.1)|Least Concern The vervet monkey (Chlorocebus pygerythrus), or simply vervet, is an Old World monkey of the family Cercopithecidae native to Africa. The term "vervet" is also used to refer to all the members of the genus Chlorocebus. The five distinct subspecies can be found mostly throughout Southern Africa, as well as some of the eastern countries. Vervets were transported to the islands of Barbados, Saint Kitts, and Nevis in conjunction with the African slave trade. These mostly vegetarian monkeys have black faces and grey body hair color, ranging in length from about 19 in (50 cm) for males to about 16 in (40 cm) for females. In addition to very interesting behavioral research on natural populations, vervet monkeys serve as a nonhuman primate model for understanding genetic and social behaviors of humans. They have been noted for having human-like characteristics, such as hypertension, anxiety, and social and dependent alcohol use. The most significant studies done on vervet monkeys involve their communication and alarm calls, specifically in regard to kin and group recognition and particular predator sightings. Did you know?
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