Ileret

The fossilized hominin footprints, which date to some 300,000 years ago, were probably left by members of the species Homo heidelbergensis

Prehistoric footprints that have puzzled scientists since the 1970s are getting a second look: Were they left by extinct animals or by human ancestors?

When famed paleontologist Mary Leakey first uncovered the footprints in Tanzania 40 years ago, the evidence was ambiguous.