Sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Tory Peterson Institute America's Best-Selling Field Guides The Peterson Identification System Roger Tory Peterson's unique system shows exactly what features to look for to tell one species from another. Ease of Use Peterson Field Guides are designed to work in the field, and every illustration, every word, is directed to that end. The Authors and Illustrators For each Field Guide, an author with expertise in the subject and an experienced artist work closely with the editors to ensure that both text and illustrations are accurate. A Field Guide to Reptiles and Amphibians This newly designed field guide features detailed descriptions of 595 species and subspecies. The 656 full-color illustrations and 384 drawings show key details for accurate identification. More than 100 color photographs and 333 color distribution maps accompany the species descriptions.