Primates Co-Operate

Group level effects were whereby individuals can do better by co operating. Its kind of derivative of er w. D. Hamilton's concept of inclusive fitness, which was very close to he was thinking in terms of a essentially kinship, groups co operating. This is just extending that a little further. It means that there's a two step process here. So the animal has to be or the individual has to be able to o negotiate the successful existence and stability of social groups. Otherwise it's backed down to a lower level of fitness, if you like.