Streak-backed Tit-Spinetail

The streak-backed tit-spinetail is 14.5 to 16.5 cm (5.7 to 6.5 in) long and weighs about 8.5 to 10.5 g (0.30 to 0.37 oz). It is a small-bodied, long-tailed furnariid with a short bill. The sexes have the same plumage. Adults of the nominate subspecies have an indistinct dirty white supercilium on an otherwise blackish and whitish streaked face. Their crown is black and heavily striped with rufous. Their back is streaked with dusky brown and tawny buff that diminish to the mostly plain olive brown rump. Their wing coverts are blackish with wide cinnamon rufous edges. Voice: The streak-backed tit-spinetail's song is "a melancholy, but musical, descending series of high, ringing whistles: tchee-LEEa'LEEa'LEEa'LEEa'LEEa'LEEa'LEE". Its calls include "a slightly wheezy twet and a trit", "a harsh cht or tzip", "a sharper chattered series of less musical tcht and tsit notes", and "a lower, gruff tchut".