Streak-backed Canastero
Asthenes wyatti
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".
ID text from Wikipedia, CC BY-SA 4.0
White-chinned Thistletail
Asthenes fuliginosa
The white-chinned thistletail is 18 to 20 cm (7.1 to 7.9 in) long and weighs 14 to 20 g (0.49 to 0.71 oz). It is the largest thistletail. The sexes have the same plumage. Adults of the nominate subspecies A. f. fuliginosa have a faint grayish-tawny supercilium and a whitish eyering on an otherwise blackish to dark brown face. Their crown, back, rump, and tail are dark reddish brown. Their wings are a brighter reddish brown. Their tail is long and deeply forked with few barbs at the feather ends that give a ragged appearance. Their chin is whitish. Voice: One of the white-chinned thistletail's songs is "a high-pitched, weak, slightly accelerating and ascending trill". Others are a "descending series of somewhat higher-pitched notes that accelerates into trill, and a slightly ascending series of tripled notes, 'tididit, tididit, tididit' ". Its calls include "a high-pitched, sharp, penetrating 'pyeek' or 'kick' " and "chink".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Streak-backed Canastero and White-chinned Thistletail.