content: And one day, we will manage to build robots that don't walk like a drunk guy who shat his pants.  Of course it shits its pants, it doesn't have any asscheeks. Heck, it doesn't have an ass at all. You'll notice that robots with proper asses walk normally. Joking aside, a dedicated hip joint (ie: ass) isn't strictly necessary for bipedal walking. However, if you remove the hips then the upper thighs have to compensate, resulting in that noticeable squat-walk.