Richard Leakey Quote

We are justified in calling all species of bipedal ape "human."... the adaptation of bipedalism was so loaded with evolutionary potential—freeing the upper limbs to be free to become manipulative implements one day—that its importance should be recognized in our nomenclature. These humans were not like us, but without the bipedal adaptation they couldn't have become us.

The Origin of Humankind (1994)