Flat-billed Vireo

The flat-billed vireo is 12 to 13 cm (4.7 to 5.1 in) long and weighs about 10 to 11 g (0.35 to 0.39 oz). The sexes have the same plumage. Adults have a greenish gray forehead, crown and nape, dark gray lores, a pale olive-yellow strip above the lores, and a broken olive-yellow eye-ring. Their upperparts are greenish gray. Their wing coverts are blackish gray with off-white tips that form two wing bars. Their flight feathers are a darker gray than the back; the primaries and secondaries have thin gray-green edges on the outer webs and the tertials have wider gray-green edges on both webs. Voice: The flat-billed vireo's song is a "hattering, high-pitched weet-weet-weet- etc., often repeated". Its calls include a "harsh scolding note".