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Baboon (Papio hamadryas) is an African and Asian Old World monkeys belonging to the genus Papio, part of the subfamily Cercopithecinae. There are five species of Baboon (Papio hamadryas), which are some of the largest non hominid members of the primate order. Only the Mandrill and the Drill are larger. Previously, the closely related Gelada and two species of Mandrill and Drill were grouped in the same genus, and these Old World monkeys are still often referred to as baboons in everyday speech.
The Baboon (Papio hamadryas) ranges in size and weight depending on species. The Guinea Baboon is 50 cm and weighs only 14 kg while the largest Chacma Baboon can be 120 cm and weigh 40 kg. A group of Baboon (Papio hamadryas) is collectively called a troop or congress. Recently the word flange has been, incorrectly, used.
Five species of Baboon (Papio hamadryas) are commonly recognized, although there is some disagreement about whether they are really full species or subspecies. They are P. ursinus, P. papio, P. hamadryas, P. anubis and P. cynocephalus. Many authors distinguish P. hamadryas as a full species, but regard all the others as subspecies of P. cynocephalus and refer to them collectively as savanna baboons. This may not be helpful. It is based on the argument that the Hamadryas Baboon is behaviorally and physically distinct from other Baboon (Papio hamadryas) species, and that this reflects a separate evolutionary history. However, recent morphological and genetic studies of Baboon (Papio hamadryas) show the Hamadryas Baboon to be more closely related to the northern Baboon (Papio hamadryas) species than to the southern species.
Baboon (Papio hamadryas) has long dog like muzzles, close set eyes, heavy powerful jaws, thick fur except on their muzzle, a short tail and rough spots on their protruding buttocks, called ischial callosities. These calluses are nerveless, hairless pads of skin that provide for the sitting comfort of the Baboon (Papio hamadryas).
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