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Blue-and-white swallow : ウィキペディア英語版
Blue-and-white swallow

The blue-and-white swallow (''Notiochelidon cyanoleuca'') is a passerine bird that breeds from Nicaragua south throughout South America, except in the deserts and the Amazon Basin. The southern race is migratory, wintering as far north as Trinidad, where it is a regular visitor. The nominate northern race may have bred on that island.〔
Sometimes placed in the genus ''Pygochelidon'',〔 it was first formally described as ''Hirundo cyanoleuca'' by French ornithologist Louis Vieillot in 1817, based on a specimen he believed to be from Paraguay.〔 The scientific name has the same meaning as the English common name.
==Description==
The adult blue-and-white swallow averages long and weighs about . It has dark blue upperparts and white underparts, and its underwings and the undersurface of its short forked tail are blackish. The juvenile is brown above, buff-tinted below, and has a less forked tail. The call is a buzzing ''dzzzhreeee''.〔
There are three subspecies. The nominate ''N. c. cyanoleuca'' occurs from Nicaragua and Trinidad south to northwestern Argentina, Paraguay and Uruguay. The migratory southern race ''N. c. patagonica'' is larger (), has paler underwings, and white basal undertail coverts. ''N. c. peruviana'' is restricted to coastal Peru up to altitude. It is smaller than ''patagonica'', has less white in the undertail, darker underwings and duskier flanks.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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