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

Blue Manakin
Chiroxiphia caudata
At a length of around 15 cm (5.9 in) and a weight of around 25.6 g (0.90 oz), this small sparrow-sized bird may be the largest species within the diminutive manakin family. Formerly, the name "swallow-tailed manakin" was used widely, but as it is misleading (the tail is unlike that of any swallow), this name has largely been abandoned for "superior blue manakin". As suggested by this common name, the male is – by far – the manakin with most blue to the plumage. The entire body is bright blue, while the wings, tail and head, except for the red cap, are black.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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