![A single footprint of Australopithecus afarensis (top), left some 3.5 …[Credits : John Reader/Photo Researchers]](http://media-2.web.britannica.com/eb-media/96/79496-004-308F8223.jpg)
![A single footprint of Australopithecus afarensis (top), left some 3.5 …[Credits : John Reader/Photo Researchers]](http://media-3.web.britannica.com/eb-media/58/79558-004-B5306C30.jpg)
A single footprint of Australopithecus afarensis (top), left some 3.5 million years ago at Laetoli, Tanzania, shows a striking similarity to a single footprint of a habitually barefoot modern human being from Peru (bottom).
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