Sibley Birds West - Written and Illustrated by David Allen SibleyCompact 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 important field marks. Each entry also includes the most current information concerning frequency, nesting, behavior, food and feeding, voice description, and key identification features. This improved