National Audubon Society Field Guide to North American Mammals
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This all-photographic field guide describes 390 species, keyed to 374 full-color photographs of the animals as they appear in their native habitat. Whitaker, John O. Jr. Vinyl cover; 93 pages; color photos. National Audubon Society; copyright 1998. Species are grouped according to type, shape, and size; a second key permits the reader to identify animals by their tracks.