Much more than simply a field guide, this monumental reference begins with an introduction to snake biology and evolution, which is followed by an identification guide and key to the North American species. The heart of the book is the species accounts which, accompanied by color photographs, provide detailed information on identifying features, geographic variation, known fossils, current distribution, habitat type, behavior, reproduction, growth, diet, and predators. Completing the book is a glossary of terms and a comprehensive reference section. No other book provides as thorough or as reliable coverage.