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Golden-winged warbler
The golden-winged warbler (''Vermivora chrysoptera'') is a New World warbler. It breeds in southeastern and south-central Canada and the Appalachian Mountains northeastern to north-central USA. The majority (~70%) of the global population breeds in Wisconsin, Minnesota, and Manitoba. Golden-winged warbler populations are slowly expanding northwards, but are generally declining across its range, most likely as a result of habitat loss and competition/interbreeding with the very closely related blue-winged warbler, ''Vermivora cyanoptera''.
==Description==
This is a small warbler, measuring long and weighing . The male has black throat (suggestive of the throat patch of a chickadee), black ear patch bordered in white, yellow crown and wing patch. Females feature a similar coloration pattern, but the black is replaced with light grey.
In both sexes, extensive white on the tail is conspicuous from below. Underparts are grayish white and the bill is long and slender. Unlike most warblers, juveniles can be reliably sexed (using throat patch color) approximately 15 days after fledging. Pure breed golden-winged warblers are almost unmistakable if seen well.
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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