Dorothy L. Cheney is professor of biology and Robert M. Seyfarth is professor of psychology at the University of Pennsylvania. They are the authors of How Monkeys See the World, also published by the University of Chicago Press.

In 1838 Charles Darwin jotted in a notebook, 'He who understands baboon would do more towards metaphysics than Locke.' "Baboon Metaphysics" is Dorothy L. Cheney and Robert M. Seyfarth's fascinating response to Darwin's challenge.Cheney and Seyfarth set up camp in Botswana's Okavango Delta, where they could intimately observe baboons and their social world. Baboons live in groups of up to 150, including a handful of males and eight or nine matrilineal families of females. Such numbers force baboons to form a complicated mix of short-term bonds for mating and longer-term friendships based on careful calculations of status and individual need.But "Baboon Metaphysics" is concerned with much more than just baboons' social organization - Cheney and Seyfarth aim to fully comprehend the intelligence that underlies it. Using innovative field experiments, the authors learn that for baboons, just as for humans, family and friends hold the key to mitigating the ill effects of grief, stress, and anxiety.Written with a scientist's precision and a nature-lover's eye, "Baboon Metaphysics" gives us an unprecedented and compelling glimpse into the mind of another species.