Monkey is a common name. Many animals in primates are called monkeys. Primates are 1 order mammals. The highest group in the animal kingdom, with developed brains; The track faces forward and the track spacing is narrow; The toes (fingers) of hands and feet are separated, and the thumb is flexible, and most of them can hold hands with other toes (fingers). Including prosimia and simian suborder. Protomonkey suborder has a fox-like face; No cheek pouch and buttock callus; The forelimb is shorter than the hind limb, and the thumb and big toe are developed, which can be opposite to other fingers (toes); The tail should not be curled or missing. Ape suborder has a human face; Most of them have cheek pouches and hip calluses; Most forelimbs are longer than hind limbs, and some big toes degenerate; Tails are long, some can be curled, and some have no tails.