ape-faced human ancestor walked steadily on two feet. To get a picture of how Lucy's species, Australopithecus afarensis, moved, scientists compare fossils to the bones of modern humans ...

How do we know if an early ape-man or woman walked upright? An examination of certain bones -- a tibia ... along the outside of the foot, and then through the middle toes. A human foot transmits ...

Lucy's bones suggest that she walked in an upright position, like a human, but possessed a relatively small ape-like skull. Lucy's foot bones show that she had similar feet to modern humans but ...