Sibley Birds West: Field Guide to Birds of Western North America (Sibley Guides)

Now completely revised and updated, the authoritative guide to over 700 birds of the American West from renowned birder, illustrator, and New York Times bestselling author David Sibley
Compact and comprehensive, this guide features 715 bird species, plus regional populations, found west of the Rocky Mountains. Entries include stunningly accurate illustrations—more than 5,046 in total—with descriptive captions pointing out the most important field marks. Each entry also includes the most current information concerning frequency, nesting, behavior, food and feeding, voice description, and key identification features. 
(Paperback)
David Allen Sibley