The booted racket-tails are a small group of hummingbirds in the genus Ocreatus that was long considered to have only one species, O. underwoodii.

They are relatively small (even compared to most other hummingbirds) and primarily iridescent green with white or rufous-buff leg-puffs ("boots").

The leg-puffs are more conspicuous in males, which also have a pair of dark bluish racket-shaped extensions to the tail.

Research published in 2016, however, argued that three subspecies groups, addae, annae and peruanus, that are mostly allopatric (only peruanus and underwoodii have ranges that are known to very locally come into contact) were sufficiently different for raising them to species level.

[3] The American Ornithological Society has yet to recognize the split and continue to place all in a single widespread species.