This best-selling dictionary is the most comprehensive and up-to-date of its kind, containing over 5,250 entries on all aspects of zoology. Complemented with numerous illustrations, it includes terms from the areas of ecology, animal behaviour, evolution, earth history, zoogeography, genetics, and physiology and it provides full taxonomic coverage of arthropods, other invertebrates, fish, reptiles, amphibians, birds, and mammals. The third edition has been fully revised and updated and includes many new entries, for example, alarm pheromone, Fick's laws, manometer, and synanthrope. It also features new material on behavioural ecology and conservation biology, and expanded coverage of cytology and taxonomy. New to this edition are recommended web links for many entries, which are accessed and kept up to date via the Dictionary of Zoology companion website. Web links provide valuable extra information by directing you to useful online resources and the homepages of relevant organizations. Following the A-Z dictionary are detailed appendices of endangered animals, the universal genetic code, the geologic time scale, and SI units. Wide-ranging, authoritative, and with jargon-free definitions, this dictionary is an indispensable reference tool for students and teachers of zoology, biological sciences and biomedical sciences, and a valuable resource for naturalists and anyone with an interest in animals.