Dusky-tailed Canastero

The dusky-tailed canastero is 14 to 16 cm (5.5 to 6.3 in) long and weighs 18 to 24 g (0.63 to 0.85 oz). The sexes have the same plumage. Adults of the nominate subspecies have a narrow whitish supercilium on an otherwise dark gray-brown face with faint paler streaks. Their crown is dark brown, their back a slightly paler brown, and paler brown rump and uppertail coverts that have a rufescent tinge. Their wings are mostly the same brown as the back with dull rufous on the shoulder. Voice: The dusky-tailed canastero has two songs which are mostly sung during the breeding season. One is squeaky disyllabic notes "gradually becoming louder, higher-pitched, and longer in duration after which notes again get fainter, shorter, and lower-pitched...chi-wee.. chi-wee". The other is a "long, somewhat variable dry rattling trill which descends in pitch".