Brown-headed Greenlet

The brown-headed greenlet is about 11 to 12 cm (4.3 to 4.7 in) long and weighs 8 to 11.5 g (0.28 to 0.41 oz). The sexes have the same plumage. Adults have a brown or dull sepia crown with a slight yellowish wash. Their face is dull brownish. Their upperparts and tail are olive-green. Their wing's primaries and secondaries are dark grayish with thin greenish olive edges on their outer webs. Their throat and upper breast are dirty white with an olive-buff tinge. Their lower breast and belly are gray-white, their flanks yellowish, and their vent pale greenish yellow. Voice: The brown-headed greenlet's song is a "high, warbling weet-oh-weeréet". When agitated it makes "a series of twitters, then 4–5 soft notes and a louder, descending series of notes, much repeated".