A New York Times BestsellerFrom world-renowned biologist and primatologist Frans de Waal, a groundbreaking work on animal intelligence destined to become a classic.What separates your mind from an animal's? Maybe you think it's your ability to design tools, your sense of self, or your grasp of past and future-all traits that have helped us define ourselves as the planet's preeminent species. But in recent decades, these claims have eroded, or even been disproven outright, by a revolution in t...

This second edition also includes: revised and expanded explanatory footnotes, a new preface and a note on the text by Leland S. Person; key passages from Hawthorne’s notebooks and letters that suggest the close relationship between his private and public writings, and seven new critical essays by Brook Thomas, Michael Ryan, Thomas R. Mitchell, Jay Grossman, Jamie Barlowe, John Ronan and John F.

Birk. A Chronology and revised and expanded Selected Bibliography is also included.