black-tailed trainbearer
lesbia victoriae latin

The Black-tailed Trainbearer (Lesbia victoriae) is a species of hummingbird in the Trochilidae family.

The longest hummingbird species, indeed the longest in the order, is the adult male Black-tailed Trainbearer (Lesbia victoriae), which can measure up to 25.5 cm (10.0 in), but a majority of this length is due to the extreme tail streamers.