Primates have several distinctive features that separate them from other mammals. Primates have well developed hands and feet, with fingers and toes. Their opposable thumb makes it easy for them to grab things. Primate eyes are forward in the head giving them stereoscopic vision. This allows them to judge distance.
Primates also have large, highly developed brains.
Their intelligence allows them to control and manipulate their environment. The highly developed visual center of the brain helps primates distinguish colors. Their large brain also allows them to develop complex language and communication skills. Monkeys and apes walk on all four limbs, but they may run upright using only their hind legs. Although primates are born fully formed, they tend to have a long gestation period in their mother's womb.