Monkeys like to sit, so this habit is easy to rub off the hair on their buttocks. After a long time, they will form a big hairless ass, and after a long time, this change has penetrated into the genes of some primates, making their ass hairless.
At the same time, it also makes their buttocks more cold-resistant and heat-resistant, and some primates even grow thick meat pads, which is more conducive to their sitting posture, eating and resting.
Monkey growth:
Not only females have sexual skin, but also males of some primates. Baboon male's ass is similar to female's, red and bright, but not as swollen as female's, but flat and red.
Monkeys give birth to one baby every six months, each with 1-3 babies. Larvae grow slowly. Crawling on the mother's chest and abdomen or riding on her back during lactation, carried by her mother. Sexually mature females have menstruation, and males can mate at any time. Only lower monkeys, such as lemurs, sloths and lynxes, have a certain mating and breeding season.
Monkeys are mostly omnivorous, mainly plants, and do not give up readily available meat. There are different ways to choose food and feed. For example, monkeys are good at picking bugs in tree holes or crevices. Orangutans eat a lot and spend most of their time foraging. The stomach of colobus monkeys has a special structure, and most species eat plant food containing a lot of crude fiber.