Black-headed Brushfinch
Arremon atricapillus
The black-headed brushfinch is about 19 cm (7.5 in) long and weighs about 49.5 g (1.7 oz). The sexes have the same plumage. Adults have an almost entirely black head with a white throat. Their upperparts, wings, and tail are olive-green. The white of the throat continues through the breast and belly. The sides of their breast are gray and their flanks and vent are grayish olive. They have a dark chestnut-brown iris, a black bill, and blackish legs and feet. Juveniles have a greenish olive head and upperparts, dull brown wings and tail, and tawny underparts. Subspecies A. a. Voice: The black-headed brushfinch's song is "a high-pitched series of rambling notes which proceed without breaks" and its call is "a sharp note".
ID text from Wikipedia, CC BY-SA 4.0
Sooty-faced Finch
Arremon crassirostris
The sooty-faced finch is 15 to 17 cm (5.9 to 6.7 in) long and weighs 37 to 40.5 g (1.3 to 1.4 oz). The sexes have the same plumage. Adults have a rusty crown and a white down-sweeping "moustache" on an otherwise blackish gray head and nape. Their upperparts are dark olive-green and their wings and tail a slightly browner olive-green. Their upper breast, sides, and flanks are dark olive-green and their lower breast and belly yellow. They have a dark brown or chocolate-brown iris, a dark gray maxilla, a pale yellow or whitish mandible, and dark legs and feet. Voice: One sooty-faced finch song is a "high-pitched, thin, emphatic pseee-psééét". Another is a "high-pitched, thin whistled see see seeya sue sue sisi see". Its call is a "sharp, thin, whistled pu-pee".
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-headed Brushfinch and Sooty-faced Finch.