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.
Others catch them for pets. The clearing of land for agricultural, housing, and industrial developments has reduced the amount of living space available to monkeys. A number of species of New World and Old World monkeys are threatened with extinction. The body of a monkey All monkeys, including those that live on the ground, are the descendants of monkeys that live in trees. As a result, all monkeys have a body primarily suited for living in and moving through trees.