Shows how researchers use scientific logic to study the underlying mechanisms and evolutionary bases of behaviour, with emphasis on how evolutionary theory unifies the various subdisciplines within animal behaviour.New to This Edition Major reorganisation of the material, such that the central concepts are presented in a different sequence from prior editions:The initial chapters focus first on the evolutionary basis of behaviour.Once the major findings of behavioural ecology have been examined, the book turns its attention to the proximate mechanisms underlying animal behaviour.Throughout, the text shows how researchers use scientific logic to study the underlying mechanisms and the evolutionary bases of behaviour, with emphasis on how evolutionary theory unifies the various subdisciplines within animal behaviour.