Alagoas Tyrannulet

The Alagoas tyrannulet is 11 to 13 cm (4.3 to 5.1 in) long; five individuals weighed 6.8 to 8.4 g (0.24 to 0.30 oz). The sexes have the same plumage. Adults have a thin whitish supercilium and an ashy blackish streak through the eye that continues to the rear and sweeps around the whitish ear coverts. Their crown, nape, back, and rump are dark olive green. Their wings are blackish olive with thin yellowish green edges to the flight feathers. Their wing coverts have wide greenish yellow tips that form two distinct wing bars. Voice: The Alagoas tyrannulet's song is "1-3 snappy and squeaky rising notes followed by a slightly slower pitched, Furnariid-like chatter of sharp, overslurred notes" that lasts about 1.5 seconds. Its primary call is "a short, nasal, sharply rising chweep! note". Both the song and call are somewhat variable.