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National Geographic Field Guide to the Birds of North America:
The field reference of choice for serious birders since its inception, the third edition has been updated to reflect new bird ranges in North America as well as the always controversial reclassifications of species and subspecies. The expanded text includes even more notes on identification, behavior, habitat, and song, while the illustrations--now revised and sharpened--depict individual species in varying plumage, often with habitat cues in the background. Like the first two editions, the guide combines accurate illustrations with useful maps and text in a portable format. Beginners and experts alike will flock to this handy field guide. [via]