Primates and Philosophers: How Morality Evolved. Princeton Science Library. By Frans de Waal; edited by, Stephen Macedo and Josiah Ober; with comments by Robert Wright, Christine M. Korsgaard, Philip Kitcher, and Peter Singer. Princeton (New Jersey): Princeton University Press. $22.95 (hardcover); $14.95 (paper). xix + 209 p.; ill.; index. ISBN: 978‐0‐691‐12447‐6 (hc); 978‐0‐691‐14129‐9 (pb). 2009.