Introduction to major principles and questions in animal behavior with emphasis on why animals behave the way they do. Examine both the proximate and ultimate issues of animal behavior, how it is acquired and regulated, and how it evolved. Focus on integration of proximate and ultimate analyses in the various domains in which animals behave. Three lecture hours a week for one semester. Biology 390D and Ecology, Evolution, and Behavior 390D may not both be counted. Prerequisite: Graduate standing, and consent of instructor and the graduate advisor.