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Least Concern (IUCN 3.1)|Least Concern

The white-eared titi (Callicebus donacophilus), also known as the Bolivian titi or Bolivian gray titi, is a species of titi, a type of New World monkey, from eastern Bolivia and a small area of Brazil. It is a medium-sized monkey with a grey back, orange underside and distinctive white ear tufts. It has an omnivorous diet, eating fruits, other plant materials and invertebrates. It is predated upon primarily by raptors, though felids and other monkey species have been known to attack the species. It is a monogamous species and lives in small groups of two to seven members consisting of the pair and their offspring. The family group has a home range of 0.005 to 0.14 square kilometres (0.0019 to 0.0541 sq mi) and the adults have a complex vocal repertoire to maintain their territory. It is also known for its characteristic twining of tails when groups are sitting together. White-eared titis can live for more than 25 years in captivity.

The white-eared titi population has a declining trend. The decline is believed to be mainly caused by human-induced habitat loss and degradation. Despite this, the International Union for Conservation of Nature (IUCN) classified the species as Least Concern in 2008 as it has shown adaptability to habitat disturbance and is found over a wide range.

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• ... that experiments have indicated that ruffed lemurs (pictured) can understand the outcome of simple arithmetic operations?
• ... that unlike most other lemurs, the collared brown lemurs do not demonstrate female dominance?
• ... that the gray mouse lemur is one of the smallest primates in the world, weighing only 60 grams (2.1 oz)?
• ... that between 2000 and 2008, 39 new species of lemur (ring-tailed lemur) were described in Madagascar, bringing the total number of recognized species and subspecies to 99?
• ... that the pied tamarin, an endangered primate of the Amazon basin, is being gradually displaced by the red-handed tamarin?
• ... ... that illegal logging in Madagascar has been an ongoing problem, which escalated after the 2009 Malagasy political crisis, threatening endangered species such as lemurs?

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Humans 

Human body • Human evolution • Human ecology • Human development

Strepsirrhines 

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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. More about Primates... File:Nycticebus coucang 002.jpg Slow lorises (genus Nycticebus) are strepsirrhine primates found in South and Southeast Asia. They range from Northeast India to the southern Philippines and from the Yunnan province in China in the north to the island of Java in the south. There are currently five species recognized: Sunda slow loris (N. coucang), Bengal slow loris (N. bengalensis), pygmy slow loris (N. pygmaeus), Javan slow loris (N. javanicus), and the Bornean slow loris (N. menagensis). Slow lorises are most closely related to other lorisids, such as slender lorises, pottos, the false potto, and angwantibos. Like other living ("crown") strepsirrhines, these nocturnal primates have a reflective layer in their eye called the tapetum lucidum, which enhances their night vision. They also have a rhinarium or "wet nose", which is a touch-based sense organ. Because of their close relation to lemurs and other lorisiforms, they also possess a toothcomb, which is used in personal and social grooming, as well as feeding. Like nearly all prosimian ("pre-monkey") primates, they have a toilet-claw, which is also used in grooming. Slow lorises have a round head, narrow snout, large eyes, and distinctive coloration patterns. Their arms and legs are nearly equal in length, and their trunk is long, allowing them to twist and extend to nearby branches. The hands and feet of slow lorises have several adaptations that give them a pincer-like grip and enable them to grasp branches for long periods of time. Slow lorises and possibly some of their closest relatives have a toxic bite—a rare trait among mammals. Little is known about their social structure, but they are known to communicate by scent-marking. Males are highly territorial. Slow lorises reproduce slowly, and the infants are initially parked on branches or carried by either parent. They are omnivores, eating small animals, fruit, tree gum, and other vegetation. All slow loris species are listed as either "Vulnerable" or "Endangered" on the International Union for Conservation of Nature and Natural Resources Red List of Threatened Species (IUCN Red List) and are threatened by the wildlife trade and habitat loss. Although their habitat is rapidly disappearing and becoming fragmented, making it nearly impossible for slow lorises to disperse between forest fragments, unsustainable demand from the exotic pet trade and traditional medicine has been the greatest cause for their decline. The white-fronted capuchin, Cebus albifrons, is a species of capuchin monkey, a type of New World primate, found in seven different countries in South America: Bolivia, Brazil, Colombia, Venezuela, Ecuador, Peru, and Trinidad and Tobago. The species is divided into several different subspecies, though the specific divisions are uncertain and controversial.