Evolutionary psychology occupies an important place in the drive to understand and explain human behavior. Darwinian ideas provide powerful tools to illuminate how fundamental aspects of the way humans think, feel, and interact derive from reproductive interests and an ultimate need for survival. In this updated and expanded edition of Evolution and Human Behavior, John Cartwright considers the emergence of Homo sapiens as a species and looks at contemporary issues, such as familial relationships and conflict and cooperation, in light of key theoretical principles. The book covers basic concepts including natural and sexual selection, life history theory, and the fundamentals of genetics. New material will be found in chapters on emotion, culture, incest avoidance, ethics, and cognition and reasoning. Two new chapters are devoted to the evolutionary analysis of mental disorders. Students of psychology, human biology, and physical and cultural anthropology will find Evolution and Human Behavior a comprehensive textbook of great value.