Barred Fruiteater
Pipreola arcuata
The barred fruiteater is among the largest of its genus at 22 to 23 cm (8.7 to 9.1 in) long and weighing 112 to 128 g (4.0 to 4.5 oz). The sexes have different plumage, though uniquely among the fruiteaters both have barred breasts. Adult males of the nominate subspecies have an entirely black head, neck, and upper breast. Their upperparts are olive-green and the wings and tail mostly that color. The wing's greater coverts and tertials have large yellow spots. The tail has a black bar near the end and whitish tips on the feathers. Their underparts are yellow with crisp black bars. Voice: The barred fruiteater's song has been described as "a very high, thin, rising whistle, then a descending whistle, often several rising or descending whistles in loose series". Its calls are described as "shorter descending, or slightly rising then descending, whistles" and a "series of very high ti or tseee notes".
ID text from Wikipedia, CC BY-SA 4.0

Green-and-black Fruiteater
Pipreola riefferii
The green-and-black fruiteater is 17.5 to 20 cm (6.9 to 7.9 in) long and weighs 46 to 61 g (1.6 to 2.2 oz). The sexes have different plumage. Adult males of the nominate subspecies P. r. riefferii have an entirely blackish green head and upper breast with a yellow band ("collar") around its base except on the nape. Their upperparts and tail are green and the wings mostly that color; the wing's tertials have white tips. Their underparts are yellow with black streaks that are heavier on the flanks than in the center. Females have a green head instead of the male's black and no yellow collar. Voice: The song of most subspecies of the green-and-black fruiteater has variously been written as "tic-tic-ti-ti-ti-tiseeeeeeeeeeeeaa" and "ts-s-s-s-s-s-se-eeeeeeeeuuw". Their call is a "ery high-pitched, sibilant ti-ti-ti-ti for up to 5 seconds, dying away". Subspecies P. r. tallmanorum's call is different, "ti-ti-ti-seeee" with a thin, high-pitched last note.
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: Barred Fruiteater and Green-and-black Fruiteater.