Most popular science books tend to misrepresent animals, presenting them either as furry little humans or as creatures that cannot feel at all. Marc Hauser, an acclaimed scientist in the field of animal cognition, uses insights from evolutionary theory and cognitive science to examine animal thought without such biases or preconceptions. Hauser treats animals neither as machines devoid of feeling nor as extensions of humans, but as independent beings driven by their own complex impulses.

In prose that is both elegant and edifying, Hauser describes his groundbreaking research in the field, leading his readers on what David Premack, author of The Mind of an Ape, calls "a masterful tour of the animal mind".