Amazon.com (ISBN 0226308642, Paperback)

In 1945, Donald Griffin was one of the codiscoverers of echolocation by bats. In the 1980s he became a leader of cognitive ethnology--the study of animals' thinking behavior--"forging a path where others fear to tread or cannot see a way," in the words of Gerald Durrell. Animal Minds is Griffin's most strongly argued summary of the evidence for cognition from every corner of the animal kingdom. This is a manifesto that "cognitive ethology presents us with one of the supreme scientific challenges of our times," and is required reading for anyone interested in the nature and distribution of minds.