Streak-capped Antwren

The streak-capped antwren is 9 to 10 cm (3.5 to 3.9 in) long; one individual weighed 6.5 g (0.23 oz). Adult males' crown, nape, and upper back are streaked black and white. The rest of their upperparts are tawny to chestnut with some yellow mixed in on the rump; they have a hidden white patch between the shoulders. Their wings are black with pale yellow edges on the flight feathers (tawny on the tertials) and white tips on the coverts. Their tail is olive-gray. Voice: The streak-capped antwren's song is a "high, sharp, ringing rattle, like 'trrrrr' " that lasts about three seconds. Its calls include a "sharp 'chip' and slightly longer, lower-pitched downslurred note"; both can delivered singly or in short bursts, and are sometimes both alternated in a longer series.