What are the anatomical defects of other species?

In the world of hyenas, female hyenas dominate everything-this is because the testosterone in female hyenas is three times that of male hyenas, which makes them more aggressive and stronger.

Guys, there are no jokes about sandwiches here. But more importantly, it will also lead them to grow "dildos", through which they can not only urinate and erect, but also … have children. However, this is a seriously flawed design, which makes Wankel look like Honda's VTEC, because their cubs are the heaviest relative to their mother's size, and the birth canal is only one inch wide. The process of producing cubs is a huge squeeze. The birth canal is V-shaped, which is twice as long as the normal birth canal of a mammal of her size. During this extremely long and tense delivery, the baby has to make a 180 degree turn. It is foolish to expect that the birth canal will go wrong. Yes, the clitoris must be separated to make way for the newborn.

It was a dangerous journey, and many cubs suffocated on the way out-to be precise, 60% of them were first-time mothers. Of course, this kind of pregnancy is incredibly difficult for mothers, and many people can't survive in this process. Because we are the only bipedal ape alive (yes, technically, humans are apes), we put extra pressure on our anus by standing up, especially sitting down. When we are standing or sitting, all our organs exert force on our anus. Specifically, the posterior rectus muscle sheath below the arch line (Douglas line) is missing, and the transverse fascia in the groin is not firm. Is inguinal hernia a defect of human evolution? Will this understanding improve the concept of surgical repair methods? -PubMed, the consequences of human adaptation to diseases, hemorrhoids-symptoms and causes, everything you need to know about hernia, Australopithecus-anatomical changes

Most other mammals exert little pressure on the anus because their anus does not carry its own weight like humans: humans often stand or sit. Because of this weakness, humans have also evolved huge gluteus maximus. In addition to walking upright, the gluteus maximus helps to keep the anus closed while supporting the weight of the digestive tract. This also helps to prevent perineal hernia:

Perineal hernia buttocks, bipedal walking into human: the ups and downs of gluteus maximus is also the only anthropoid ape with muscular buttocks. Extra (this is part of the original post): This is why the doctor suggested limiting the time to go to the toilet.

Typical toilet seat: squatting on the toilet: when sitting on the toilet, almost all the weight is placed on the buttocks, and the anus receives the whole body pressure. Your foot has adapted to great strength, its ligaments, tendons, bones and muscles have been strengthened, and your anus is not so strong. In addition, the angle of our digestive tract is not vertical when sitting. However, when you squat down, your legs and your anus and small intestine support your weight more to excrete waste.