Because the buttocks of baboons are swollen and deformed, only female baboons in estrus have this situation. During estrus, the buttocks of these baboons will become bigger and redder, and some will even be deformed, which makes people suspect that the baboons are injured. In fact, the female baboon's ass is red, and she is as proud as a peacock, both of which are actively displayed to attract the opposite sex. It can be understood that in the world of female baboons, the more beautiful baboons look, so they are naturally willing to show their red and ugly buttocks.

When these baboons reach estrus, the increase of estrogen in the body promotes the acceleration of blood circulation and exposes the capillaries on the skin more clearly. Therefore, the skin of the buttocks is red and will become shiny because of edema.

Therefore, for such creatures as baboons, the deeper the swelling and deformation of perineal skin, the greater the attraction to males of the same kind. This is the truth that the survival of the fittest develops naturally, because only males with stronger attack can give birth to better offspring. So baboon, a species whose female buttocks turn red during estrus, also shows that baboon, a primate, is a species with high reproductive competition.

People who often go to the zoo know that baboons are very popular animals in the zoo, and their popularity is even higher than that of monkeys, especially the red buttocks of female baboons, which attract many tourists to watch and play. Sometimes, some caring people worry that fighting has caused this kind of trauma to baboons. Actually, there is no need to worry. In the eyes of baboons, this is a good thing. I think it's courtship, too. It's nice to be proud. The red ass of a baboon is ridiculous. But fortunately, baboons only have red buttocks in estrus, and they look fine under normal circumstances. The world is full of miracles. Baboons only courted in a slightly different way.