Rio Orinoco Spinetail

The Rio Orinoco spinetail is 13 to 16 cm (5.1 to 6.3 in) long and weighs 11.5 to 14 g (0.41 to 0.49 oz). The sexes have the same plumage. Adults have a whitish supercilium and whitish line beneath the eye on an otherwise gray face and forehead. Their crown is orange-rufous, their nape smoke-gray, and their back, rump and uppertail coverts light grayish brown. Their upperwing coverts are cinnamon-rufous, their greater coverts somewhat olive-brown, and their flight feathers olive-brown. The underside of their wings is grayer than the upperside. Voice: As of late 2023 xeno-canto had no recordings of Rio Orinoco spinetail vocalizations and the Cornell Lab of Ornithology's Macaulay Library had only a few. The species' main vocalization is "a series of 6–9 rapid but well-separated notes, first one accentuated not run together in a rattle-trill". It also gives "a longer and more hurried series of notes, also a single loud note".