The research included professors Kevin Hatala from Chatham U. in Pittsburgh and Craig Feibel of Rutgers and showed two human species might have competed or cooperated.

A newly discovered set of footprints in Kenya provides the first evidence that two different species of ancient human relatives walked the same ground simultaneously 1.5 million years ago.The researchers behind the finding say the footprints belong to the species Homo erectus and Paranthropus boisei and were left within hours or days of one another — which opens up new mysteries about what happened when the two crossed paths.

Scientists discovered fossilized footprints along Lake Turkana, Kenya, revealing that early human ancestors Homo erectus and Paranthropus boisei coexisted around 1.5 million years ago. The distinct footprints show different walking styles,

Muddy footprints left on a Kenyan lakeside suggest two of our early human ancestors were nearby neighbors some 1.5 million years ago. The footprints were left in the mud by two different species “within a matter of hours,

Two sets of fossilized footprints from early human species were made within a few hours of each other about 1.5 million years ago, researchers suggest

As Homo erectus and Paranthropus boisei – a direct ancestor and an ancestral relative of modern humans, respectively – lived their lives in the Turkana Basin, they left their footprints, impressed deep in the mud around the lake, probably with barely a thought.

Researchers discovered 1.5-million-year-old footprints in Kenya's Turkana Basin, revealing coexistence of Paranthropus boisei and Homo erectus. The pr

The researchers believe the footprints were made within hours of each other on the shores of an ancient lake in present-day Kenya.

(Reuters) - About 1.5 million years ago, individuals of two different species in the human evolutionary lineage trudged on a muddy lakeshore in northern Kenya, leaving behind intersecting trackways alongside the footprints of antelopes, horses, warthogs, giant storks and other animals.

Newly discovered 1.5-million-year-old footprints reveal how two extinct human species crossed paths within hours of each other.

Two species of ancient human relatives crossed paths 1.5 million years ago. Fossilized footprints in Kenya captured the moment, according to a new study.