Learn fascinating facts about your wild feathered friends with the Sibley Field Guide Birds East North America. This compact and comprehensive guide features 650 bird species, plus regional populations found east of the Rocky Mountains. The entries include more than 4,601 accurate illustrations, while descriptive captions point out the most important field marks. The entries have been updated to include the most current information on details like frequency, nesting, behavior, food and feeding, voice description, and key identification features. Plus, more than 601 updated maps drawn from information contributed by 110 regional experts showcase information like winter, summer, year-round, migration, and rare ranges.