The Sibley Field Guide to Birds of Western North America (2nd Ed. Sibley Guides)by David Allen Sibley 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 illustrationsmore than 5,046 in totalwith descriptive captions pointing out the most