Chestnut-capped Brushfinch
Arremon brunneinucha
The chestnut-capped brushfinch is 16 to 19.5 cm (6.3 to 7.7 in) long and weighs about 32 to 47 g (1.1 to 1.7 oz). It is one of the larger brushfinches. The sexes have the same plumage. Adults of the nominate subspecies A. b. brunneinucha have a wide black mask from their forehead and forecrown down to below the gape and back to the side of the neck. Within it they have a small white spot above the lores. Their crown and nape are chestnut with a thin yellowish tawny supercilium separating it from the top of the mask. Voice: One description of the chestnut-capped brushfinch's song is "a jumble of high-pitched, slurred whistles and staccato notes, peetee-zeer, peetee-súueet". Another is "a fairly slow, high-pitched series of sharp whistles: tseeee-tseeu-pseee-tzzzeeee". A third is "a high, sibilant series of thin whistles...for example: see-swee-sew-see-swee-SEER".
ID text from Wikipedia, CC BY-SA 4.0
Orange-billed Sparrow
Arremon aurantiirostris
The orange-billed sparrow is 14.5 to 16.5 cm (5.7 to 6.5 in) long and weighs about 35 g (1.2 oz). The sexes have the same plumage and all subspecies have the eponymous bright orange bill. Adults of the nominate subspecies A. a. aurantiirostris have a black crown with a gray stripe along its middle and a wide white supercilium on an otherwise black face. Their upperparts are olive-green and their wings and tail a darker olive-green with yellow at the bend of the wing. Their chin has a small black area and their throat is white with a wide black band below it across the upper upper breast. Voice: The orange-billed sparrow's song varies geographically though in general is "high-pitched, either a series of alternating lilting notes or thin whistles". In northern Central America it is an "extremely high-pitched series of sharp whistles" that lasts about two seconds; its call there is a "smacking tsiit!".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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