I meant primitive societies. All (again, to the best of my knowledge) vegetarian societies are neolithic. These practices emerged after the invention of writing and the adoption of "organized" religions, i.e. after humans began to ponder the morality of killing animals (which, as I've said, is an issue worth pondering). This is not surprising because vegetarianism depends on farming (which in itself kills lots of animals). Humans can't survive on foraging alone (not unless they happen to live in a particular region where enough nutrition is to be found in naturally growing plants; I don't know if such a place even exists). This simply goes to show that this particular moral question is of a special nature because human evolution is so intricately tied with meat.