A Field Guide to the Nests, Eggs, and Nestlings of North American Birds
Describes all species found in the North American region and offers information on breeding cycles, nesting habits, and provides pictures of nestlings and eggs
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Keys to identification
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adults Altricial and downy areas bark Begins early Begins late bill birds blotched blue branch Breeding season brooded brown buff building Built cavity clutch concentrated creamy-white dark dark brown dead deep early June edge egg color varies Eggs Eggs laid elliptical feathers female fibers fine finer fork Gape flanges grasses gray greenish ground growth hair hatching head hole hollow Incubation intervals larger end light lined mainly male markings moss mottled Mouth Nestling period occasionally olive oval pale paler parents pattern plant purple rarely reddish-brown rock rootlets sexes shallow short subelliptical shrub side similar Single-brooded Skin slightly glossy Smooth Smooth and glossy Smooth and slightly sometimes Sparrow sparse species speckled spotted stripe thick tinted tips tree twigs unmarked usually variable vegetation Warbler weed stems weeks wings woodland yellow Young tended