Streak-backed Canastero

The streak-backed canastero is 16 to 18 cm (6.3 to 7.1 in) long and weighs 17 to 25 g (0.60 to 0.88 oz). The sexes have the same plumage. Adults of the nominate subspecies A. w. wyatti have a narrow buff supercilium on an otherwise grizzled light brown and blackish face. Their crown, nape, back, rump, and uppertail coverts are olive-brown. Their forehead has dark brown flecks that become thin streaks on the crown and nape and wider streaks on the back. Voice: Despite its very large north to south range, the streak-backed canastero's song and calls appear to differ little among the subspecies. Its song is a "dry rattling phrase that gradually ascends in frequency while accelerating and increasing in amplitude until the very end when it suddenly fades and drops in frequency ti-ti-tititittrrreeuw".