At the dawn of the 21st century, a coherent vision of animal lifestyles has emerged, as scientists have realized the important roles evolution, behaviour, and ecology play in determining why mammals do what they do. In three comprehensive volumes, this work details developments in natural history and science in a way that engages general readers as well as students and researchers. A Factfile section presents key details on 40 animals, including diet, breeding, habitat and life expectancy. A listing of scientific names for all the species mentioned is included, as well as hundreds of ""Animals in Close Up"" featuring articles emphasizing the importance of animal conservation. Also a system of cross references is included that allow the reader to easily move between chapters, the Factfile and Key Word sections.