According to foreign media reports, why are human buttocks different from other animals? Ask 10 people randomly, and you can get 10 different answers. People have put forward various speculations that it may be related to the relatively large human brain, or to the human body language of complex language, or to the ability of human beings to significantly change the world around them. < / P > < p > let’s take a look at the animal kingdom! Even close relatives of humans, such as chimpanzees, bonobos and gorillas, don’t have the same butt as humans. The main reason may be our unique way of movement. We are the only mammal living mainly on two legs. Becoming an upright biped has an important impact on our buttocks. < / P > < p > we usually think that the anatomical structure of the “buttock” is mainly composed of adipose tissue on the gluteal bone, which is attached to the pelvis. Ultimately, our pelvic structure determines the shape of our buttocks, and the pelvis has undergone some significant changes over the past six million years. < / P > < p > the pelvis is composed of three parts: two hips and one sacrum. Each hip bone is made up of three bones (ilium, ischium and pubis), which are gradually fused together in the process of growth and development. < / P > < p > the pelvis is composed of three parts: two hips and one sacrum. Each hip bone is made up of three bones (ilium, ischium and pubis), which are gradually fused together in the process of growth and development. The iliac bone of chimpanzees is relatively high and flat, with both sides of the flat ilium forward or backward, while the human iliac bone is relatively short and curved close to both sides, which makes the human pelvis a bowl structure. These differences in the size and shape of the ilium are related to the evolution of bipedal animals and the gluteal muscle reorganization that makes it possible for humans to walk upright. The gluteus muscle consists of three parts: gluteus maximus, gluteus medius and gluteus minimus. Compared with other primates, human gluteus maximus (especially the upper half) is very large. It helps to extend and move back the thigh. It provides strength support when we run or climb stairs. It plays a great role in forming the hip shape. However, in other ape species, the so-called “gluteus minimus (gluteus medius and gluteus minimus)” also plays a similar role, so the gluteus maximus is not the main part, which eventually leads to differences in hip shape between human and ape species. < / P > < p > on the contrary, when we stand on one leg, the function of our gluteus minimus is to help the gluteus muscle not to disperse to both sides. By changing the gluteus minimus and its function, the bending structure of human hip bone can be realized to stand on one leg. Our gluteus minimus provides standing stability, not strength. < / P > < p > we can track and analyze the changes in the shape of the ilium, and infer the function of the gluteus muscle in the human evolutionary history (starting from the early human ancestors of the great apes, including the Pleistocene primates like Lucy and Homo erectus) in the human evolution history, and found that the ilium generally became shorter, wider and more curved with time, which means that the human buttocks experienced It took millions of years of evolution to form the anatomical parts that can express human feelings. < / P > < p > our pelvic structure determines the shape of our buttocks, and this group of bones has undergone some significant changes over the past six million years. The most important factor that makes human buttocks different is fat, which may have something to do with our being bipedal creatures. The human brain is relatively large and consumes a lot of energy. Our body stores energy in the form of fat. For a non aquatic mammal, the proportion of fat in human body is relatively high. Thus, anthropologists suggest that fat in humans helps buffer our brain, which has a high metabolic cost, through periods of nutritional deprivation. This seems to be what we can do, because walking on the ground is an effective way to move around and avoid the disadvantage of living on a branch for a lifetime – it has to be used to support all the weight, and it takes a lot of energy to survive under the control of gravity. Orangutans, by contrast, seem to do better, with strong bodies, flexible bodies, well proportioned limbs, not to mention opposite big toes. Global Tech