Necklaced Spinetail

The necklaced spinetail is 11 to 13 cm (4.3 to 5.1 in) long and weighs 10 to 14 g (0.35 to 0.49 oz). It is one of the smallest members of genus Synallaxis. The sexes have the same plumage. Adults of the nominate subspecies have a white supercilium on an otherwise blackish face with faint whitish streaks. Their forecrown has black and white streaks. The rest of their crown is dull grayish brown, their back slightly browner, their rump rufescent-brown, and their uppertail coverts bright rufous. The wing has whitish at the bend; the coverts and secondaries are rufous and the primaries dusky. Voice: The necklaced spinetail's principal song is "a short stuttering chatter ending with several squeaky emphasized notes...trrr-tr-tr-kweet...kweet". Pairs sing in duet, usually in the early morning and late afternoon, and usually from deep in dense vegetation though sometimes from a visible perch. Its calls include a "long rattled series of notes...