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Blackpoll warbler
The blackpoll warbler (''Setophaga striata'') is a New World warbler. Breeding males are mostly black and white. They have a prominent black cap, white cheeks and white wing bars. The blackpoll breeds in forests of northern North America, from Alaska, through most of Canada, the Great Lakes region and New England. They are a common migrant through much of North America. Come fall, they fly South to the Greater Antilles and the Northeastern coasts of South America in a non-stop long-distance migration over open water, averaging 2500 km, one of the longest distance non-stop overwater flights ever recorded for a migratory songbird. Rare vagrants to western Europe, they are one of the more frequent transatlantic passerine wanderers.
==Description==
The blackpoll warbler is a fairly small bird which attains the weight of a ball point pen.〔 However, it is one of the larger of the diverse ''Setophaga'' genus (formerly ''Dendroica''). In the species, body length can vary from and wingspan can range from . Body mass can vary from , with an average bird anywhere between . Among standard measurements, the wing chord is , the tail is , the bill is and the tarsus is .〔Curson, Jon; Quinn, David and Beadle, David (1994). ''New World Warblers: An Identification Guide'', ISBN 0-7136-3932-6.〕 The summer male blackpoll warblers have dark-streaked brown backs, white faces and black crowns. Their underparts are white with black streaks, and they display two white wing bars. The adult females essentially resemble washed-out versions of the summer males, and in particular, the females lack the strong head patterns, and their crowns and faces are shades of gray. Another outstanding physical characteristic of the species are the bright orange, pink legs.
Non-breeding birds of this species have greenish heads, dark-streaked greenish upperparts and yellowish breasts, with the yellow extending to the belly in young birds. Their wing bars are always present.
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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