Key to North American birds: Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology ... and Field ornithology, Volume 1
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A. O. U. List Adult American ashy base belly Bill and feet Bill black birds blackish bone breast breeding brown cavity cervical collar characters chestnut color Coues coverts crissum crown culmen dark darker dusky Eastern eggs extent feathers Flycatcher genera genus gray greenish ground hind toe Horned Lark inner secondaries Length less Lower California mandible marked maxillary Mexico middle toe muscles nasal nearly neck Nest nostrils olivaceous ornithology Oscines outer oviduct ovum pale paler passerine plumage primaries quadrate bone quills region remiges Ridgw Rocky Mts rufous rump scapulars sexes shade sides of head skin skull slender sometimes Song Sparrow Sparrow species specimens speckled spots sternum streaked stripe subspecies tail-coverts tail-feathers tarsus throat Thrush tinged Titmouse toe and claw usually vertebra vomer Warbler webs whitish wing-coverts wings and tail winter yellow yellowish young