Roots of human morality in other primates

Nicholas Wade of the New York Times has written another interesting article, this time about the seeds of human moral behavior that can be observed in other primates. He discusses the social order that are established among other kinds of primates and the social rules and behaviors that help keep groups functioning, and how humans might have elaborated on these to derive our own complicated moral systems. He includes some interesting quotes from primatologist Frans de Waal and covers some of the debate between moral philosophers and biologists on where morals come from.