Ape, chicken, cow, dog, pig, rat, sheep, snake, beast. Each of these words has a distinct connotation, none of them positive. The fact is, though, that no animal behavior can compete with the aggressive and destructive violence exhibited by humans on a regular basis. Animal advocate Jeffrey Moussaieff Masson has published numerous bestsellers about the rich emotional lives of animals. In his latest thought-provoking book, Beasts, Masson turns his attention to humans, posing the questions: who are the real beasts, why, and what can we do about it?