Muddy footprints left on a Kenyan lakeside suggest two of our early human ancestors were neighbors some 1.5 million years ago.

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,

Newly discovered fossil footprints indicate two different ancient human relatives walked upright around a muddy lake in Kenya.

Muddy footprints in Kenya reveal two early human species, Homo erectus and Paranthropus boisei, coexisting 1.5 million years ago.

Muddy footprints left on a Kenyan lakeside suggest two of our early human ancestors were nearby neighbors some 1.5 million years ago.

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