-Surprising. Impressive. Cannibalism restores my faith in humanity.- --Sy Montgomery, The New York Times Book Review

For centuries scientists have written off cannibalism as a bizarre phenomenon with little biological significance. Its presence in nature was dismissed as a desperate response to starvation or other life-threatening circumstances, and few spent time studying it. A taboo subject in our culture, the behavior was portrayed mostly through horror movies or tabloids sensationalizing the crimes of real-life flesh-eaters. But the true nature of...