It's a little outdated, but anyone interested in "extinct human species", or proto-humans, should read Jared Diamond's book "The Third Chimpanzee", which is abo

It's a little outdated, but anyone interested in "extinct human species", or proto-humans, should read Jared Diamond's book "The Third Chimpanzee", which is about the small genetic and vast cultural differences that separate us from other large primate, including the two other types of chimp...