. Key to North American birds [microform] : 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. Birds; Ornithology; Oiseaux; Ornithologie. 320 S YSJ'KMA TIC SY\OPSIS. — PA SSERES — OSCINES. is wiircoly or not Imlf hh loiij; us the 1st; socomlarirs aiitl their coverts also very short; all tht'M' quill-tVi tilers hroati and stout. An aeiite, thiii-hladeil and somewhat falcate wing, of Huriiassini,' volatorial (Kiwer, resnlts from these inoditieations. Tail of \'i reetr
. Key to North American birds [microform] : 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. Birds; Ornithology; Oiseaux; Ornithologie. 320 S YSJ'KMA TIC SY\OPSIS. — PA SSERES — OSCINES. is wiircoly or not Imlf hh loiij; us the 1st; socomlarirs aiitl their coverts also very short; all tht'M' quill-tVi tilers hroati and stout. An aeiite, thiii-hladeil and somewhat falcate wing, of Huriiassini,' volatorial (Kiwer, resnlts from these inoditieations. Tail of \'i reetriees, ]>erha|)s ahnormally only ID, usually forked, or at least emarjiinate, and often deejily forfieate, the outermost feathers heini; in tliis latter case narrowly linear in shajie for a considerahle dis- tance. Feet short, small, and weak, ill-ada]ited to secure fout-hoid, and very liadly formed for walk- inji. Swallows scarcely use their feet lor locomo- tion, relying nuiinly u]iun their )irowess of (liidon. The tarsal enveloj^e thor- oughly Osciuo in struct- ure, being scutellate in front and latninatehehind; it is sometimes ]iartially, or almost entirely, feath- ered ; the tarsi are com- moidy shorter than the lateral toes. The digits ]iossess the normal mimlier iif |ihalanges; the hasal |ilialaii.\ of the niiddlo digit is conimouly coherent with line or both lateral toes; the hallux is ordi- nary, and not reversilde. The digits are commonly naked and scutellate, rare- ly feathered to the claws. 'I"he claws are compara- tively .strong, compressed, well-curved, and acute, apt for dinging. Tho plunuige is soft, smooth, and hleiided, most fre- ijUeiilly glossy or even iridescent, hut sometimes lustreless. lleiul short, broad, and deprosed ; neck short. Mouth capu- clous, its greatest width e<|ualling that of the head. This is a iierfeetly natural group, wi II distinguished by the foregoing <-haracters. Tho pwallows alone reprr-sent, among Oscines, the tissi
Size: 1258px × 1987px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
