Monkeys are members of three species of ape primates, primates are the population of the animal kingdom, monkeys generally have developed brains, the orbits are facing forward, the orbital spacing is narrow, the toes (fingers) of the hands and feet are separated, the thumbs are flexible, and most can be compared with other proto-monkey suborders and ape suborders.

Monkey
Monkeys are a common name for primates. Primates are the highest class of the animal kingdom and eat fruit. Monkeys generally have developed brains, the orbits are facing forward, the orbital spacing is narrow, the toes (fingers) of the hands and feet are separated, the thumbs are flexible, and most can be held against other toes (fingers). These include prototypraceae and suborder Apes.
Some of the characteristics of monkey species are similar, for example, many New World monkeys will have a coiled tail so that they can be used to grasp branches when they climb trees, while Old World monkeys do not have a coiled tail, but have smaller nostrils, and the distance between the nostrils is also relatively close, and some of the backs are hard-skinned, like embedded seat cushions; some are also like humans with tricolor vision; others are bicolor or monochromatic. Although old and new world monkeys, like apes, have forward eyes, the faces of the two are different; and each species of monkey cub has certain characteristics, such as the type of nose, jaw, and buttocks. Therefore, if you want to understand monkeys, you must learn their individual different characteristics.
Monkey is a common name, and many of the animals in primates we call monkeys. It is a mammalian order, which belongs to the highest class of the animal kingdom and has a well-developed brain, including proto-monkey suborders and suborder apes. Proto-monkey suborder is fox-like; buccal sac and breech;forelimbs are shorter than hindlimbs; thumbs and big toes are well developed and can be opposed to other fingers (toes); the tail can be curled or absent. The ape suborder is human-like; most have cheek sacs and rump calluses; most of the forelimbs are longer than the hind limbs; some of the large toes are degenerate; the tail is long, some can be curled, and some have no tail. According to regional distribution or nostril structure, the suborder Ape is divided into the Broad-nosed Monkey Group, also known as the New World Monkey Group, and the Narrow-nosed Monkey Group, also known as the Old World Monkey Group. This order includes about 180 species in 51 genera in 11 families, mainly distributed in the warm belts of Asia, Africa and the Americas, mostly inhabiting forested areas. The largest of the primates is the gorilla, which weighs up to 275 kilograms, and the smallest is the bonobo monkey, which weighs only 70 grams. The skull characteristics of the tree family are quite similar to some very primitive proto-monkey species, and many anatomists and paleontologists have included it in primates, but their external morphology and ecological habits are very different from those of primates, so modern taxonomists have made it independent of trees.
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