A field guide to western birds: field marks of all species found in North America west of the 100th meridian, with a section on the birds of the Hawaiian Islands
The most information on all land and water birds of western North America and Hawaiian Islands.
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Accidental Adult Alaska Alberta Aleutians America Arctic Arizona Baja California belly bill blackish blue breast Breeds brown buff buffy bush Bushtit Canada Canada Goose Casual cheek coast Colorado conifer crest crown dark DOWITCHER DUCK dusky Edwards Plateau Eggs Eurasia eye-ring Female Field marks FINCH flight FLYCATCHER forests gray gray-brown grayer greenish GULL Habitat Hawaii Hawaiian HAWK head House Sparrow HUMMINGBIRD Idaho Immature islands Junco Kauai lacks legs Mackenzie south Male marshes Mexico Migrates Montana neck Nest Nevada Note Oahu Oregon ORIOLE Pacific pale PETREL Plains PLOVER plumage prairies Resident rufous rusty SANDPIPER Saskatchewan Saskatchewan south SHEARWATER Similar species smaller Song SPARROW spotted streaked striped tail TERN Texas panhandle throat tree tundra U.S. Winters underparts Utah VIREO Voice WARBLER West whistle white patch white rump white wing patch whitish wing-bars Winters mainly WOODPECKER woods Wyoming yellow yellowish Yukon