The Encyclopedia of Mammals has been comprehensively revised and updated to reflect the most recent developments in modern zoology. It covers the behaviour, diet, distribution, and evolution of every known living mammal in the world in clear, accessible language, and is superbly illustrated throughout with photographs and original artwork. There are also feature articles on a range of fascinating topics, such as: Why do primates have big brains? Why do lions roar? And what are the costs of motherhood for seals?