African hominid fossils show ancient steps toward a two-legged stride
New cache of Ardipithecus ramidus bones reveals advances in upright walking 4 million years ago
![Ardipithecus ramidus ankle bone](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/02/022119_BB_ardigona_feat.jpg?fit=860%2C460&ssl=1)
WALKING TALL A researcher holds an Ardipithecus ramidus ankle bone after its discovery at an East African site not far from where Ardi, a partial skeleton of the same species, was found previously.
S.W. Simpson