Baboon n. : One of the Old World Quadrumana, of the genera Cynocephalus and Papio; the dog-faced ape. Baboons have dog-like muzzles and large canine teeth, cheek pouches, a short tail, and naked callosities on the buttocks. They are mostly African. See Mandrill, and Chacma, and Drill an ape.

Example:
How do I get rid of a Baboon in my house?

Taxonomy
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Defination from the web:
Baboon and infant at Ngorongoro Crater, Tanzania ... These calluses are nerveless, hairless pads of skin that provide for the sitting comfort of the baboon. In all baboon species there is pronounced sexual dimorphism, usually in size but also sometimes in colour or canine development. ...