This tail is sometimes pre-hensiled and may be used to hang by, as in the case of spider monkeys and capuchin monkeys. However, some smaller members like the mouse lemurs and as well as the largest monkeys, the baboons, do not have this ability. Primates, a mammalian order containing over 230 species, is made up of monkeys, apes, humans and other similar forms. All primates are omnivorous, although many who live in rain forests eat vegetation almost exclusively.
Primate eyes face forward which allows for binocular vision.
Primates vary greatly in size from the mouse lemur that weighs as little as 2 ounces, to the gorilla which weighs more than 400 pounds. Primate skulls generally have large brain cases that approach globular form. The jaws are relatively short and the face is flattened. The eye orbits of a primate skull are encircled by bone and the orbits are directed forward. Natural Bone Catalog No.