beija-flor-verde vs beija-flor-de-veste-preta

The Green-tailed Goldenthroat and Black-throated Mango can be distinguished by their undertail patterns: the Goldenthroat has white undertail coverts with green discs, while the Mango's plumage reflects different colors at different angles. Size differences are subtle, with the Goldenthroat being slightly smaller.

Check the undertail coverts: Green-tailed Goldenthroat has white with green discs; Observe plumage color changes: Black-throated Mango reflects different colors from various angles.

The Green-tailed Goldenthroat is slightly smaller, with a wing length of 52 mm and tail length of 31 mm, compared to the Black-throated Mango's 59 mm wing and 32 mm tail.

The Green-tailed Goldenthroat has white undertail coverts with green discs, while the Black-throated Mango's plumage can reflect different colors from different angles.