<classify> Bipedal specializations zisangibwa mu magumba ga Australopithecus okuva Ku bukadde bwemyaka 4.2-3.9 egyayita, yadde Sahelanthropusyanadiba yatambulira Ku magulu abiri nga bukyaali mu myaka obukadde musanvu egyayiita.  <topic>: TransportHistory 