It is possible to see Hrdy’s most recent book, Mothers and Others, as the third in a trilogy that began with The Woman That Never Evolved. It may be the most important. As she demolished, in the first, the idol of an evolved passive femininity, and in the second, the serene, always giving maternal goddess, in her third synthetic work she takes on another cultural and biological ideal: the mother who goes it alone. In our once male-dominated vision of evolution, we had the lone brave man, the hunter with his spear, and the lone enduring woman nurturing her young beneath the African sun; they made a deal, the first social contract, exchanging the services each was suited to by genetic destiny.

Hrdy has not been alone in challenging this myth. A conference and book edited by Richard Lee and Irven DeVore, although it was called Man the Hunter, showed that women brought in half or more of the food of hunter-gatherers by collecting vegetables, fruit, and nuts.3 This meant that, given the unpredictability of hunting success and the human need for plant foods, the primordial deal between the sexes was rather more complex than we thought. It also suggested that women had power in these societies; that men listened to them and decisions were made by consensus, not by male fiat as in more complex, hierarchical societies.