Little monkey catching fish by the river outdoors

Monkeys are of medium size, with equal limbs or slightly longer hind limbs, long or short tails, cheek pouches and callose arms, and arboreal or terrestrial life, which are common features of monkeys. Most skulls of monkeys have large skull cavities, which are spherical, because the jaw changesShow more

Monkeys

Monkeys

Short, caused by flattening of the face; The posterior orbital process develops to form a bone ring or a completely closed eye socket; Most species have short noses, and their olfaction is inferior to that of vision, touch and hearing. Some lower species have highly developed olfactory centers in the brain, and act on olfaction to a large extent. Some lemurs have long noses. The nasal bones of the genera Rhinopithecus and Amur langur degenerate to form upturned nostrils. The nose of the genus Rhinopithecus is large and long. These special types are formed by the development of muscle or cartilage. The big toe of the foot and its toe can hold each other, making the hand and foot become grasping organs. The five fingers of the original monkeys can only be bent and stretched at the same time, and cannot be used individually. The palm surface is bare, with finger and toe lines, and the patterns are different. It has a very soft or wide foot pad. Except for black apes, they are all walking. Most species have flat nails at the fingertips and toes. Generally, there is no difference in the length of the front and rear limbs, except that the forelimbs of the gibbon family and the orangutan family are much longer than the hind limbs. Apes and humans have no tails. Among species with tails, the tail length varies greatly, from only one protuberance to more than the body length. The tails of most species of Capuchinidae have the function of grasping and are called "the fifth hand". Some Old World monkeys (such as baboons) have bright colored skin on their faces, buttocks or chests, especially during the breeding period. The buttock has a hard mass composed of thick and hard skin, which is called the buttock callus.

Most species have a pair of nipples in the chest or armpit, while the fingerling monkey has a pair of nipples in the abdomen. Male penises are pendulous, most of them have penile bones, while the tarsiers, villous monkeys, humans and some species do not. The testis is enclosed in a sac. The female has a bicorned uterus or a single uterus. The body coat is either soft and fine, or thick and hard, or long in some parts, or has heterochromatic links on the hair. Some of the hairs on the top of the head are very long, forming clumpy hair crowns, or very short, flat topped, or bald and hairless. Some have long hair on both cheeks or under the jaw, shaped like a beard. Some shoulders, back and buttocks are covered with long hair. Some body hair is very bright.