Mosquitero del Cáucaso Phylloscopus nitidus

Nondescript leaf warbler with two whitish wing bars (often only one visible), dull to bright greenish upperparts, a yellow wash usually restricted to the face, and a pale orange lower bill. Breeds in forest in the Caucasus mountains. Winters primarily in southern India, where it largely overlaps with the similar-looking Greenish Warbler. Although separable from Greenish Warbler by its greener upperparts, yellow on face, and the second wingbar (when present), Green is best identified by its loud, fast, trisyllabic “chi-su-wi” call.