Many other Old World monkeys live on the ground. Among the monkeys that live on the ground, the males may be twice as large as the females. See the Related Articles at the end of this article for a list of the monkeys about which World Book has separate articles. But monkeys and apes differ in several ways. For example, apes are more intelligent than monkeys.
Most monkeys have a tail, but none of the apes do.
Monkeys are smaller than most apes. Apes are expert climbers. Monkeys generally run, jump, and leap among tree branches. Human activities have greatly reduced the number of monkeys throughout the world. Some people hunt monkeys for food.