Long-crested Pygmy Tyrant

The long-crested pygmy tyrant is 10 to 10.5 cm (3.9 to 4.1 in) long and weighs 6.5 to 8 g (0.23 to 0.28 oz). The sexes have the same plumage. Adults have long black crown feathers with gray edges. They form the eponymous crest that it sometimes erects and fans; they extend beyond the rear of the head when folded. Adults have whitish lores on an otherwise olive face. Their back, rump, and uppertail coverts are olive. Their wings are dusky with olive tips on the coverts; the latter show very weakly as two wing bars. Their tail is dusky. Their throat and underparts are whitish with gray streaks. Voice: The long-crested pygmy tyrant's song is "an accelerating and falling series of ringing notes: pit-pit-pit-pit-piteeeeerrr". Its primary call is "single pip notes, often in loose series". It also makes "several pip notes in a rising-falling series".