Tanzania.

Mary Leakey found the footprints of an adult and child preserved in volcanic ash. (This is the earliest evidence for bipedalism.)

They walked northward across the ash fall from a nearby volcano, the child walking in the footsteps of the adult. Small antelope passed by, and a brief rainstorm fell across the landscape before further eruptions buried the footprints.

(Roland Fletcher, The Evolution of Human Behavior)

  -- evolution of behavior?
aren't kids still walking in grownup's feet prints ?

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