Barred Becard
Pachyramphus versicolor
The barred becard is 12 to 13 cm (4.7 to 5.1 in) long and weighs 14 to 17 g (0.49 to 0.60 oz). It is the smallest member of genus Pachyramphus. Adult males of the nominate subspecies have a glossy black crown and nape and greenish yellow lores and eye-ring. Their face is also greenish yellow. Their upperparts are mostly glossy black with a slate gray rump and uppertail coverts. Their wings are black with white edges on the greater coverts and remiges. Their scapulars and lesser and median coverts are white with black edges. Their tail is slate gray with white edges on the feathers. Voice: The barred becard's song has been described as a "rising or rising-falling, accelerating series of thin, high whistles: wur wee WEE-WEE’WEE’WEE-WEE" and its calls as "thin, squeaky wsee notes in a chattered series".
ID text from Wikipedia, CC BY-SA 4.0

Crested Becard
Pachyramphus validus
The crested becard is 17 to 18.5 cm (6.7 to 7.3 in) long. The species is sexually dimorphic. Though its crown is somewhat shaggy it does not have an obvious raised crest. Adult males of the nominate subspecies have a mostly dark grayish to almost black crown, upperparts, wings, and tail with a partially hidden white patch on the back and some white on the scapulars. They have a smoky gray spot above the lores on an otherwise grayish face. Their throat is whitish gray and their underparts pale smoky grayish with a cinnamon tinge. Voice: The crested becard is not highly vocal. It sometimes makes an "unstructured series of extr./very high, sharp rolling and strident see notes". Its song has also been described as "a low, clear, vibrating, descending series of 6–8 dui whistles" and its call "a shrill tsree whistle".
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 Becard and Crested Becard.