"For 40 years, anthropologists have leaned toward the notion that rich, nourishing meat - brought home by hunters and shared out - played a crucial role in human origins. This would explain why evolution selected for larger, smarter hunters with lighter jaws and teeth: precisely the changes seen as Homo erectus arose in eastern Africa. "

Well, now they think that we didn't hunt, and that our source of meat was scavenging - something still practised today by the Hadza people.