Rufous-crowned Elaenia

The rufous-crowned elaenia is about 14.5 to 15 cm (5.7 to 5.9 in) long and weighs about 19 g (0.67 oz). It is a small elaenia with a small but distinctively colored crest. The sexes have the same plumage. Adults have a dark olive-brown head with lighter cheeks, a faint whitish supercilium, and a thin whitish eyering. Their crown has a rufous patch that is usually concealed but is sometimes visible at the rear of the crest. Their upperparts are dark olive-brown. Their wings are mostly dusky with pale edges on the flight feathers. Voice: The rufous-crowned elaenia's main vocalizations are an "energetic, rapid 'tji-tji-rrrrr' and other rattles and trills...that often start with downslurred 'Wée-of-' ".