Müller -Schwarze (environmental and forest biology, State U. of New York School of Environmental Science and Forestry) and Sun (biology, Central Washington U.) have written a comprehensive survey of beavers. The text, which is scientifically rigorous yet will be accessible to the diligent amateur naturalist, contains discussion of beavers' history, behavior, populations, ecology, and relationship to humans. Individual chapters discuss topics that include food, communication, parasites and diseases, habitat requirements, and other animals and plants that benefit from beaver habitats. The five chapters on beavers and people feature case studies and practical advice for successful integration of beavers near human habitation. Annotation (c) Book News, Inc., Portland, OR (booknews.com)