Bipedalism is a very important peculiarity of a human being, which helped it to obtain its modern image. It is such a form of motion when an organism moves with the help of two legs. It is a very significant change for an organism. Each part of its structure is influenced by this change. Moreover, it is possible to determine bipedalism judging only on one bone. It is possible to notice changes influenced by this factor even on a separated skull. The position of the skull is centered above the spinal column because of the change of position of the center of gravity. It is possible to determine such peculiarity of an organism based on these evidences only.