Araguaia Spinetail

The Araguaia spinetail is 15 to 16 cm (5.9 to 6.3 in) long. The sexes have the same plumage. Adults have dull whitish lores on an otherwise brownish gray face. Their crown is grayish brown, their mantle, back, and rump bright rufous, and their uppertail coverts dark rufous. Their wings are bright rufous with fuscous-brown tips on the flight feathers. Their tail is dark rufous; it is graduated and the feathers have blunt tips. Their throat is white; their underparts are mostly tan with a whitish center on a paler belly. Their iris is cinnamon brown, their maxilla black to dark gray, their mandible gray, and their legs and feet gray to dull brownish.

The Araguaia spinetail is found in east-central Brazil along the Araguaia River and some of its tributaries, in northwestern Goiás, southwestern Tocantins, southeastern Pará, and northeastern Mato Grosso. It inhabits landscapes very near water including gallery forest, riparian woodland and scrublands, and river islands. It occurs below 1,000 m (3,300 ft) of elevation.

The Araguaia spinetail's diet has not been studied. It usually forages in pairs, in vines and tangles in the understorey, mostly up to about 2 m (7 ft) above the ground. It gleans its prey from foliage and small branches.