<classify> An sami kwarewar dabbobi masu tafiya da kafafu biyu a ƙasusuwan tarihi na Australopithecus daga shekaru miliyan 4.2-3.9 da suka shude, duk da cewa watakila Sahelanthropus sun yi tafiya da kafafu biyu tun wajen shekaru miliyan bakwai da suka gabata.  <topic>: TransportHistory 