. 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, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . Fio. 37G. — Chimney Swift. 660 5 YS TEMA TIC S YNOP SIS. — PICA RIJ^— CORA CLE. notes, it has mostly forsakeu the ways of its ancestors, who bred in hollow trees, and now placesits
. 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, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . Fio. 37G. — Chimney Swift. 660 5 YS TEMA TIC S YNOP SIS. — PICA RIJ^— CORA CLE. notes, it has mostly forsakeu the ways of its ancestors, who bred in hollow trees, and now placesits curious open-work nest of bits of twig glued together with saliva, inside disused or little used chimneys in settled parts ofthe country. In districts stillprimitive, however, it continuesto use hollow trees, to whichit resorts by thousands to impossibly winters in suchretreats in a lethargic state!The dry twigs for its prettybasket-like nest are snappedofl the trees by the birds in fullflight. No soft lining is used ;the nest is shaped like half asaucer, 3 or 4 inches across by2 or 3 in the other width, andless than an inch deep; thetwigs used are from half aninch to 2 inches or even morein length, and a sixteenth to. Fig. 377. —Nest and Eggs of Chunuey Swift. an eighth of an inch thick, usually much varnished over with the dried saliva. The eggs are4-5, seldom 6, to long by broad, thus narrowly elliptical, and pure white. Sogreat are the volitorial powers of this bird, that the sexes can come together on the vauxi. (To Wm. S. Vaux, of Philadelphia.) Vauxs Swift. Similar; paler; rumpand upper tail-coverts lighter than rest of upper parts; throat whitish. Smaller; length jwing the same; tail Pacific Coast region, U. S. and British Columbia, rarely in theinterior E. of the Sierras Nevadas and Cascade ranges ; S. in winter to Central America. Nestand eggs as in the common species; eggs averaging a trifle smaller. This species s
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
