The monkey is a commonly known as. Primates in many animals we call monkey. Primates are the class Mammalia 1 head. Animalia most higher taxa, the brain developed towards the front; orbit, orbital spacing narrow; the hand and foot toe (HSI) separately, the thumb is flexible, the majority can and other toe (HSI) to hold. Including the suborder Prosimii and anthropoidea. Prosimii face like fox; no cheek pouches and gluteal callosity; short forelimbs from the hind, the thumb and the big toe developed, with other finger ( toe) relative; tail should not curl or absent.猴是一个俗称。灵长目中很多动物我们都称之为猴。灵长目是哺乳纲的1目。动物界最高等的类群，大脑发达；眼眶朝向前方，眶间距窄；手和脚的趾（指）分开，大拇指灵活，多数能与其他趾（指）对握。包括原猴亚目和猿猴亚目。原猴亚目颜面似狐；无颊囊和臀胼胝；前肢短于后肢，拇指与大趾发达，能与其他指（趾）相对；尾不能卷曲或缺如。