Guianan Tyrannulet

The Guianan tyrannulet is 9 to 12 cm (3.5 to 4.7 in) long and weighs 5.7 to 11 g (0.20 to 0.39 oz). The sexes have the same plumage. Adults have a gray forehead and crown. They have a thin whitish supercilium that starts at their lores and a dark stripe through the eye on an otherwise almost pure white face. Their back and rump are dull olive. Their wings are dusky with thin yellow edges on the coverts and inner parts of the flight feathers. Their tail is dusky olive. Their throat is almost pure white, their breast pale olive-yellow, and their belly and undertail coverts pale yellow. Voice: The Guianan tyrannulet's dawn song is described as "a fast series of cricket-like notes, 'tueet, tue're'RE!...tueet, tue're'RE!'. Another author described it as "a short, hard whistle, tuu, de'de, 1st note descending, last 2 higher" with two to four notes in a series that is repeated multiple times after short pauses.