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.
Parents also care for and educate their young much longer than other animals.
This results in a strong bond between a baby and the mother. Primates are very social animals, and tend to form strong bonds with family and friends. While humans are similar to monkeys in many ways, there are also several significant differences. The human brain is more than twice the size of other primates. This makes humans the most intelligent primate, with the most developed communication, language and reasoning skills.