spider and howler monkeys, and Old World [[monkey]]s like languars and baboons. Apes are somewhat similar to monkeys, but have no tail. As formulated by most [[biologist]]s, they include gorillas, gibbons, chimps and humans. | spider and howler monkeys, and Old World [[monkey]]s like languars and baboons. Apes are somewhat similar to monkeys, but have no tail. As formulated by most [[biologist]]s, they include gorillas, gibbons, chimps and humans. |