About Vireo carmioli S.F.Baird, 1866
The yellow-winged vireo (Vireo carmioli S.F.Baird, 1866) measures 11 to 11.5 cm (4.3 to 4.5 in) in length and weighs approximately 13 to 15 g (0.46 to 0.53 oz). Males and females share identical plumage. Adult yellow-winged vireos have a gray-green crown, and a whitish to buffy yellow area above the lores paired with an eye-ring that creates the appearance of spectacles. Their nape and upperparts are dull greenish. Their wing coverts are dark greenish gray with wide whitish to pale yellow tips that form two distinct wing bars. Their primaries and secondaries are blackish gray with wide yellow-green edges, and their rectrices are blackish gray with wide greenish yellow edges along the outer webs. Their throat is yellowish white, their breast and belly are yellow with yellowish green sides, and their vent is yellow. Adults have a brown iris, a blackish upper mandible (maxilla), a pale gray lower mandible, and gray or bluish gray legs and feet. Juveniles differ from adults by having a more brownish back, more ochraceous wing bars, a buffy white supercilium, and a buff tinge on the breast. This species is the only vireo found in Costa Rica that has both yellow wing bars and yellow underparts. The yellow-winged vireo occurs in the Cordillera Central and Dota Mountains of Costa Rica, and in the Cordillera de Talamanca, which extends from central Costa Rica south into Chiriquí Province in western Panama. It inhabits humid evergreen forest in the upper subtropical and temperate zones. In Costa Rica, its elevational range is from roughly 1,900 m (6,200 ft) up to the treeline at about 3,000 m (9,800 ft). In Panama, it ranges from approximately 1,300 m (4,300 ft) up to the treeline.
