Many-striped Canastero
Asthenes flammulata
The many-striped canastero is 16 to 17 cm (6.3 to 6.7 in) long and weighs 17 to 27 g (0.60 to 0.95 oz). It is a large canastero and the most dramatically striped of them. The sexes have the same plumage. Adults of the nominate subspecies have a buff-whitish supercilium on an otherwise dark brownish face with buff to whitish streaks. Their forehead is bright tawny-brown or rufescent brown with dark brown stripes that widen to become the brown crown with rufescent streaks. Their upperparts from back to uppertail coverts are dark brown with conspicuous pale buff streaks. Voice: The many-striped canastero's song is an "accelerating series of buzzy notes that initially rises in pitch, and towards the end smoothly changes into a stuttering descending trill tzee-tzee-tzee-tzeetzeetzetztztztzrrrrrrr". It typically sings from a perch atop a shrub, and sometimes two birds countersing. The song differs little among the subspecies.
ID text from Wikipedia, CC BY-SA 4.0
Rusty-vented Canastero
Asthenes dorbignyi
The rusty-vented canastero is 14.5 to 16.5 cm (5.7 to 6.5 in) long and weighs 17.5 to 24 g (0.62 to 0.85 oz). It is a medium-sized canastero. The sexes have the same plumage. Adults of the nominate subspecies have a light gray supercilium and an indistinct brownish line behind the eye in an otherwise dull buff face. Their crown, nape, and back are pale brown and their rump and uppertail coverts rufous brown. Their wing coverts are rufous chestnut and their flight feathers dusky with wide rufous chestnut edges on the inner ones. Voice: The rusty-vented canastero's song "may begin with a series of introductory notes, but these apparently are not always given. The song then...accelerates and ascends, before descending and decelerating near the end". Its call has been described as a "wheezy, earthcreeper-like whee" and as a "rising, penetrating shreep! or whee". It usually sings from atop a bush or small tree.
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: Many-striped Canastero and Rusty-vented Canastero.