Hunter-gatherer communities lasted for millions of years, so they predated homo sapiens. People of the lake: Mankind and its beginnings by Richard Leakey and Roger Lewin, published 1978
very much opposed to the Ardrey, Morris, and Lorenz school of man the murderer and meat-eater. They argue plausibly that co-operation and sharing were the keystones in the arch elaborating human structure. Gathering, rather than hunting, was always the backup insurance that one would eat.