Here is one of the ways we know that they were 'big toe' walkers. You think Lucy was the only australopithecus find? You think that there are not fossils of their feet from other specimens? http://www.msnbc.msn.com/id/14922303/ Here is one of the ways we know that they were 'big toe' walkers. You think Lucy was the only australopithecus find? You think that there are not fossils of their feet from other specimens? http://www.msnbc.msn.com/id/14922303/The fellow in the background has just found a message written in the ash, “Australopithecus was here”. Unfortunately the date was left off.