Children

"Children do not see themselves as apprentice adults. They are trying to be good at being children, which means trying to find a niche within groups of peers - conforming, but also differentiating themselves; competing, but also collaborating. They get their language and their accents largely from their peers, not their parents." Ridley, p 256.

"Ancestral human beings reared their children in groups, with women engaged in what zoologists called 'cooperative breeding'. The natural habitat of the child was therefore a mixed nursery of children of all ages - almost certainly self-segregated by sex for much of the time. It is here, not in the nuclear family or the relation w/ parents, that we should look for the environmental causes of personality." Ridley 256.