This is the most comprehensive and trusted guide to reptiles and amphibians of western North America. The new edition retains the realistic and accurate paintings by Robert Stebbins and includes 160 color photographs for additional detail. All range maps are up to date and placed within their species accounts. Family, genus, species, and subspecies names have been updated to the currently accepted usage. Illustrations of eggs and larvae, which can aid in identifying salamanders and frogs, are a particularly helpful feature.

The area covered includes Alaska, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming, Alberta, British Columbia, Saskatchewan, Northwest Territories, the western corner of Nunavut, Yukon, and Baja California.

Sponsored by the National Audubon Society, the National Wildlife Federation, and the Roger Tory Peterson Institute