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A lively, literate book, loaded with case studies on animal behavior, intellect, and instinct. Publisher's Weekly Leavened with humor, Yoerg's clear, logical and well-written discussion of a complex subject will lead even the casual reader in to a much better understanding of the many answers to the question 'what is intelligence?' Booklist

Sonja I. Yoerg is a former researcher and lecturer in Psychology at the University of California, Berkeley, and at the Museum of Vertebrate Zoology.