Newly discovered fossil footprints indicate two different ancient human relatives walked upright around a muddy lake in Kenya.
Researchers have discovered footprints that show two species of ancient human relatives may have coexisted at the same time 1.5 million years ago.Multiple sets of footprints in an ancient basin in Kenya reveal that human evolution had more meandering forks in the road than highways.
In the 1950s, renowned evolutionary biologist Ernst Mayr even argued that no two species of ancient humans overlapped. But understanding how and when ancient humans learned to walk upright, known as bipedalism, has been harder to investigate. "Finding prints from two different species is not unexpected, although it is great to find," Professor Herries said.
Ancient Humans Kenya Bipedalism Walking Upright Hominin Fossil
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