One set of prints is clearly larger than the ... By contrast, when a chimpanzee tries to walk upright, its feet stay wide apart, its center of gravity shifts side-to-side, and it awkwardly teeters ...

But this trail, some 80 feet long and preserved ... Leakey's group to discover. The prints, say experts on hominid body structure, are strikingly different from those of a chimpanzee, and in ...