Pale-tailed Canastero

The pale-tailed canastero is 14.5 to 16.5 cm (5.7 to 6.5 in) long and weighs 17.5 to 24 g (0.62 to 0.85 oz). It is a medium-sized canastero. The sexes have the same plumage. Adults of the nominate subspecies have a light gray supercilium and an indistinct brownish line behind the eye in an otherwise dull buff face. Their crown, nape, and back are pale brown and their rump and uppertail coverts rufous brown. Their wing coverts are rufous chestnut and their flight feathers dusky with narrow rufous chestnut edges on the inner ones. Voice: The song of the pale-tailed canastero's subspecies A. h. usheri is "a thin even-paced trill that rises and falls". It usually sings from atop a bush or small tree. The song of the nominate subspecies has not been described.