This book presents a series of review chapters on the various aspects of primate kinship and behavior, as a fundamental reference for students and professionals interested in primate behavior, ecology and evolution. The relatively new molecular data allow one to assess directly degrees of genetic relatedness and kinship relations between individuals, and a considerable body of data on intergroup variation, based on experimental studies in both free-ranging and captive groups has accumulated, allowing a rather full and satisfying reconsideration of this whole broad area of research. The book should be of considerable interest to students of social evolution and behavioral ecology.