Black-billed Treehunter
Thripadectes melanorhynchus
The black-billed treehunter is 20 to 20.5 cm (7.9 to 8.1 in) long and weighs 39 to 46 g (1.4 to 1.6 oz). It is a bulky, dark furnariid with a thrush-like shape. The sexes have the same plumage. Adults of the nominate subspecies have a mostly blackish-brown face with well-defined buff streaks and lores that are grizzled blackish brown and buff. Their crown is blackish brown with narrow buff streaks. Their back is dark brown with buff streaks and their rump dull dark brown that blends to reddish brown uppertail coverts. Their wings are rich dark brown and their tail dark chestnut-brown. Voice: The black-billed treehunter's song is "an accelerating, then decelerating, slightly descending series of c. 10–13 sharp 'kyip' notes with 'laughing' quality". The notes are sometimes paired.
ID text from Wikipedia, CC BY-SA 4.0

Flammulated Treehunter
Thripadectes flammulatus
The flammulated treehunter is 24 to 25 cm (9.4 to 9.8 in) long and weighs 50 to 62 g (1.8 to 2.2 oz). It is the largest and most strikingly patterned member of its genus. The sexes have the same plumage. Adults of the nominate subspecies have a blackish face and crown with sharp tawny-buff streaks that are rather golden on the crown. Their lores are speckled with blackish and golden buff. Their back is browner than the face and crown, with its blackish only along the feather shafts, and it blends to the rich medium brown rump. Their uppertail coverts are dark reddish brown. Voice: The flammulated treehunter's song is "a series of grating notes that start as a stutter, then accelerates and becomes louder". Its contact call is "an emphatic sharp 'check' ".
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: Black-billed Treehunter and Flammulated Treehunter.