High Quality Content by WIKIPEDIA articles! The Yellow-green Vireo, Vireo flavoviridis, is a small passerine bird. It breeds from southern Texas (especially the Rio Grande Valley) in the United States and the western and eastern mountain ranges of northern Mexico (the Sierra Madre Occidental and Sierra Madre Oriental—also the Cordillera Neovolcanica) south to central Panama. It is migratory, wintering in the northern and eastern Andes and the western Amazon basin. The adult Yellow-green Vireo is 14–14.7 cm in length and weighs 18.5 g. It has olive-green upperparts and a dusky-edged gray crown. There is a dark line from the bill to the red-brown eyes, and a white supercilium. The underparts are white with yellow breast sides and flanks. Young birds are duller with brown eyes, a brown tint to the back, and less yellow on the underparts. The adult Yellow-green Vireo differs from the Red-eyed Vireo in its much yellower underparts, lack of a black border to the duller gray crown, yellower upperparts and different eye color.

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