The bronze-tailed comet (Polyonymus caroli) is a species of hummingbird in the "coquettes", tribe Lesbiini of subfamily Lesbiinae.

Their tail is somewhat long and deeply forked and its central feathers are bronzy green.

[6] The bronze-tailed comet's diet is not known in detail, though it is known to be mostly insectivorous and also eats small arthropods.

The bronze-tailed comet's apparent song is "a short trill that rises in pitch and then descends".

While foraging it makes ""a dry, rapid chatter: tcht or tchtcht.