ALSO BY FRANS DE WAAL

The Age of Empathy (2009)

Primates and Philosophers (2006)

Our Inner Ape (2005)

My Family Album (2003)

The Ape and the Sushi Master (2001)

Bonobo (1997)

Good Natured (1996)

Peacemaking among Primates (1989)

Chimpanzee Politics (1982)