Two ancient hominid species with slightly different gaits crossed paths in East Africa.
Footprints preserved on what was once a muddy lakeshore indicate that the two species, each built to walk in its own way, hung out there around 1.5 million years ago.
Newly discovered foot impressions at the northern Kenyan site, and footprints previously unearthed at a nearby location, offer glimpses of coexistence and possibly direct contacts between ancient hominid species over a span of up to 200,000 years, say paleoanthropologist Kevin Hatala of Chatham University in Pittsburgh and colleagues.
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