Rufous-headed Pygmy Tyrant

The rufous-headed pygmy tyrant is about 11 cm (4.3 in) long and weighs 7 to 9 g (0.25 to 0.32 oz). The sexes have the same plumage. Adults have an entirely bright orange-rufous head and throat. Their upperparts are dark olive and their tail dull chestnut. Their wings are dark dusky with wide dull chestnut edges; the wings appear fully chestnut. The central Peruvian population has browner wings. Their breast and flanks are grayish olive and the center of their belly and their undertail coverts creamy yellow. Voice: The rufous-headed pygmy tyrant's song has been described as "a protracted and very high-pitched trill, at first descending, then ascending, 'tsi-i-i-i-i-i-e-e-e-u-e-e-e-i-i-i-i?' " and its call as "a sharp and drawn-out, rattled 'tzrrrrrrrrrrrr' ". The song has been similarly described a "a deep, descending trill followed abruptly by a rising, higher-pitched trill" grrrrrrew'REEEEEEE?