Blue Mountain Elaenia

The Blue Mountain elaenia is 14.5 to 16 cm (5.7 to 6.3 in) long and weighs about 13 to 15 g (0.46 to 0.53 oz). It is a medium-sized elaenia with a slight crest. The sexes have the same plumage. Adults of the nominate subspecies have a dark olive-brown head with white or pale yellowish lores, a faint white or pale yellowish eyering, a faint darker line through the eye, and a thin white strip in the center of the crown that is usually not visible. Their upperparts are dark olive-brown. Their wings are dusky with paler edges on the flight feathers. Voice: The Blue Mountain elaenia's day song is "tseerrr-che-wit-che-wit ... tseerr-che-wit ... che-wit ... che-wit". It also makes "a rather long downslurred plaintive whistle".