TEXAS:- Walking on two legs went hand inhand with change in the human skull , say scientists who found that bipedal mammals have a more forward-positioned foramen magnum than their four-legged relatives. The evolution of walking on two legs in fossil humans can be detected by checking the foramen magnum - the place at which the spinal cord passes through the skull , researchers said. Compared with other primates, foramen magnum in humans is shifted forward, they said. Researchers, including those from Stony Brooke University in the US, have shown that a forward-shifted foramen magnum is found not just in humans and their bipedal fossil relatives, but is a shared feature of bipedal mammals more generally.–DC