Blue-backed Manakin
Chiroxiphia pareola
Like other manakins, the blue-backed manakin is a compact, brightly coloured forest bird, typically 13 cm long and weighing 19 g. The male is mainly black with a bright blue back, and pale orange legs. The crown is typically red, but yellow in C. pareola regina from the south-west Amazon. The female has olive-green upperparts, and somewhat paler olive underparts. Young males are olive, but show a red cap and the start of a blue back as they mature. The race endemic to Tobago, C. p. atlantica is larger and has more extensive red on the crown and blue on the back.
ID text from Wikipedia, CC BY-SA 4.0

Yungas Manakin
Chiroxiphia boliviana
The Yungas manakin is 12 to 13 cm (4.7 to 5.1 in) long and weighs about 14 to 22 g (0.49 to 0.78 oz). The species is sexually dimorphic, though both sexes have a short tuft of feathers on the forecrown. Adult males have a small dark red patch in the center of their crown and a pale blue back. The rest of their plumage is black. Adult females have olive-green upperparts with browner wing coverts and flight feathers. Their underparts are a paler green that becomes paler still on the lower belly and undertail coverts. Voice: The Yungas manakin's song is "a loud "CHEW'LEW!", "CHEW!", "TCHAW", or "WHEW!" and is often sung in chorus. The male's display call is "a quiet, nasal, buzzy errwahh repeated several times". Another call is "a rising, ani-like huLEE?".
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: Blue-backed Manakin and Yungas Manakin.