Tufted Tit-Spinetail

The tufted tit-spinetail is 15 to 17 cm (5.9 to 6.7 in) long and weighs 10 to 12 g (0.35 to 0.42 oz). It is a small, slender, long-tailed furnariid with a short crest and a short bill. The sexes have the same plumage. Adults have a thin pale supercilium on an otherwise dull grayish brown face. Their crown and crest are dark brown with paler streaks, their back and rump dull grayish brown, and their uppertail coverts a paler grayish brown with a tawny tinge. Their wings are mostly grayish brown with some paler feather edges and tips. Their tail is mostly dark fuscous with some dull rufous at the ends of the outermost feathers; it is graduated and the feathers narrow at the tips giving a spiny appearance. Their throat and upper breast are whitish with faint brownish markings; the rest of their underparts are pale grayish brown with slightly darker flanks and undertail coverts. Their iris is brown, their bill black with a pale base to the mandible, and their legs and feet dark olive-green. Juveniles do not have a crest; they have a less distinctly marked crown and breast than adults and rounded tail feathers.

The tufted tit-spinetail is found in northern and central Argentina from Salta Province to Buenos Aires Province, in western Rio Grande do Sul in extreme southern Brazil, and in most of Uruguay. There are only sight records in Paraguay, which leads the South American Classification Committee of the American Ornithological Society to call it hypothetical in that country. It inhabits a variety of landscapes including gallery forest and other riparian zones, arid scrublands, dry woodlands, and brushy areas and Monte Desert near the last. In elevation it ranges from sea level to 1,000 m (3,300 ft).

The tufted tit-spinetail feeds on arthropods. It forages in pairs or in small groups that may be families, and feeds from the forest's understorey to its canopy. It usually forages by gleaning its prey from foliage, twigs, and the bark of branches. It sometimes hangs upside down to reach prey.