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The black-whiskered vireo (''Vireo altiloquus'') is a small passerine bird, which breeds in southern Florida, USA, and the West Indies as far south as the offshore islands of Venezuela. It is a partial migrant, with northern birds wintering from the Greater Antilles to northern South America. This species has occurred as a rare vagrant to Costa Rica. The breeding habitat is open deciduous wooded areas and cultivation, and in Florida also mangroves. The black-whiskered vireo builds a cup nest in a fork of a tree branch, and lays 2-3 white eggs. This vireo is 14–15 cm in length, has a 25 cm wingspan and weighs 17–19 g. It has thick blue-grey legs and a stout bill. The adult black-whiskered vireo has dull olive-green upperparts and white underparts, with yellowish on the flanks and under the tail. It has red eyes and a grey-brown crown with faint dusky edges. There is a dark line through the eyes and a white eyebrow stripe. There is a distinctive black line (the “whisker”) on the neck sides. Juvenile birds are similar, but have brown-red eyes. This species is similar to red-eyed vireo, but is duller and browner above, and is best distinguished by the black whisker mark. The song is a three-syllable ''whip, Tom Kelly'', more abrupt than that of red-eyed vireo. The Florida race ''V. a. barbatulus'' is shorter-billed by 15% than the northern Caribbean subspecies ''V. a. bonairensis''. The latter form has occurred in the USA as a vagrant to Florida and Louisiana. The black-whiskered vireo gleans insects from tree foliage, sometimes hovering while foraging. It will also eat small quantities of berries This bird suffers from nest parasitism by the brown-headed cowbird in its US range, and shiny cowbird further south. ==See also== *Fauna of Puerto Rico *List of Puerto Rican birds *List of Vieques birds 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Black-whiskered vireo」の詳細全文を読む スポンサード リンク
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