article_snippet: Scientists are not sure when our skeleton evolved to create our unique walk, but Scientists believe the answer could lie in our big toes, which our use in the propulsive phase of walking, unlike apes which use it to climb and grasp.
article_snippet: As well as offering crucial evolutionary insights into the timing and appearance of modern human gait focused on the hallucal metatarsal in groups of modern humans, gorillas and chimpanzees, because the big toe, or hallux, plays a pivotal role during the propulsive phase of walking and running in humans.
article_snippet: In other living apes, the big toe is more thumb-like
article_snippet: so the big toe can be used for grasping and climbing.