Coopmans's Elaenia

Coopmans's elaenia is about 13.5 cm (5.3 in) long. It is a small elaenia with a small squarish crest. The sexes have the same plumage. Adults have a brownish olive head with lighter cheeks, a thin whitish eyering, and a mostly hidden white patch on the crown. Their upperparts are brownish olive. Their wings are mostly dusky with whitish edges on the flight feathers. The tips of their wing coverts are white and show as two wide bars on the closed wing. Their tail is dusky. Their throat is gray, their breast gray-olive, and their belly and undertail coverts pale yellow. Voice: The vocalizations of Coopmans's elaenia were the principal evidence used to establish it as a species separate from the lesser elaenia. The two populations have similar but not identical dawn songs. That of the northwestern population is rendered "tsee...tsee...chee-wee" while that of the eastern population is "wit...wit...weedeew". Its daytime song is "a burry 'bweer, wheeb, wher'r'r'r' ".