Cordilleran Canastero
Asthenes modesta
The cordilleran canastero is 15 to 16 cm (5.9 to 6.3 in) long and weighs 13 to 22 g (0.46 to 0.78 oz). It is one of the smaller canasteros. The sexes have the same plumage. Adults of the nominate subspecies A. m. modesta have a narrow light buff-brown supercilium, dark brownish lores, brownish ear coverts, and a whitish buff-brown malar region with darker brown streaks. Their crown, nape, back, rump, and uppertail coverts are dull dark brown, though the back is paler and sandier in the southern part of the species' range. Voice: The cordilleran canastero's song is "an ascending fast trill that ends abruptly". It also makes a "more complex trill with introductory notes". Its calls are "a short, low 'pyup' or 'tjit' ".
ID text from Wikipedia, CC BY-SA 4.0
Sharp-billed Canastero
Asthenes pyrrholeuca
The sharp-billed canastero is 14 to 15 cm (5.5 to 5.9 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). It is one of the smaller canasteros, with a pointed bill that is thinner than those of most others. The sexes have the same plumage. Adults of the nominate subspecies have a gray-brown face with a paler supercilium. Their crown is dull brown, their back and rump a slightly paler brown, and their uppertail coverts long and browner. Their wings are mostly dull rufescent brown. Voice: The sharp-billed canastero's song is "a 2-note trill, 'tsee-ee-ee-ee, tsee-ee-ee-ee' " and its contact call "a rising 'sweep' ".
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: Cordilleran Canastero and Sharp-billed Canastero.