This course will review the social systems and behavior of our closest living relatives, the primates. The course will be divided into three parts. I will begin by outlining questions about primate behavior. In this section the order primates will be introduced by examining the biology and behaviour of prosimians, monkeys, and apes. Second, various aspects of social primate systems including spacing, mating, and grouping patterns will be discussed. The course will conclude by reviewing selected topics of primate behavior, such as infanticide and vocal communication. I will draw heavily on field studies of primates and emphasize their behavior in natural environmental and social settings.