Exploring the full range of animal behaviour studies, this handbook covers the late 1990s state-of-the-art as well as important historical developments in the field since its beginnings over a century ago. It features essays by comparative psychologists and other animal behaviour researchers in experimental psychology who examine and report on the research and discoveries in the areas of evolution, development, and species-typical behaviour. The handbook is a major reference work offering a psychological perspective of the field. It also provides numerous examples of other major approaches to animal behaviour, and discusses and compares them. It is designed as a sourcebook for students in comparative psychology, ethology, sociobiology, anthropology and evolutionary psychology, and can be reference book for scientists working in these fields and for the lay person who would like to understand animal behaviour.