Rusty-headed Spinetail

The rusty-headed spinetail is 16 to 18 cm (6.3 to 7.1 in) long and weighs 15 to 17 g (0.53 to 0.60 oz). The sexes have the same plumage. Adults are mostly bright reddish rufous. They do have dark lores, a dull grayish olive back, olive flanks, and a somewhat duller rufous tail. Their iris is reddish brown, their maxilla black, their mandible blue-gray, and their legs and feet gray to blue-gray. Juveniles have a much duller crown than adults, and tawny-olive edges on their underparts' feathers and faint barring on their belly. Their irises are light brown and their mandible yellowish pink. Voice: The rusty-headed spinetail's song is "3 fast notes, di-di-du". It is often repeated at short intervals for minutes at a time.