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APPROACHES TO THE STUDY OF ANIMAL BEHAVIOR; History of the Study of Animal Behavior; Genetic Analysis of Behavior; Natural Selection and Ecological Analysis of Behavior; Learning; Physiological Analysis--Nerve Cells and Behavior; Physiological Analysis of Behavior--The Endocrine System; The Development of Behavior; BEHAVIOR OF THE INDIVIDUAL SURVIVING IN ITS ENVIRONMENT; Biological Clocks; Orientation in Space; Mechanisms of Orientation; Foraging; Antipredator Behavior; Sexual Reproduction and Sexual Selection; Parental Care and Mating Systems; BEHAVIOR OF GROUPS--SOCIAL BEHAVIOR; Sociality and Dispersion; Maintaining Group Cohesion 1: Description and Evolution of Communication; Maintenance of Group Cohesion 2: Functions of Communication and Contact; Altruism; Summary; Appendix; References; Indexes.