Here we have crazy monkey face pics for you to view. Monkey belongs to a large and varied family of mammals of the primate. Member of the mammalian order Primates includes humans, apes, monkeys, and prosimians or lower primates. Monkeys are excellent climbers and most are primarily arboreal and they live in tropical or subtropical climates. They are almost all day-active animals. We can devide monkeys into two large groups: Old World monkeys (Cercopithecoidea) and New World monkeys (Ceboidea).