Rufous-booted racket-tail

The rufous-booted racket-tail (Ocreatus addae) is a species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae. It is found in Bolivia and Peru.

All racket-tails have pronounced sexual dimorphism. Only the male has elongated outer rectrices (tail feathers) that have bare shafts with terminal flags. On both the annae and addae racket-tails, those feathers are decurved and cross; the flags are asymmetric ellipses. Male rufous-booted racket-tails are 11 to 15 cm (4.3 to 5.9 in) long including the 5.5 to 6 cm (2.2 to 2.4 in) long outer tail feathers, and weigh 2.5 to 2.7 g (0.088 to 0.095 oz). Females are 7.6 to 9 cm (3.0 to 3.5 in) long and weigh 2.6 to 3.2 g (0.092 to 0.11 oz). Both sexes of annae and addae have greenish upperparts without a glittering forehead, both have a white spot behind the eye, and both have buff leg puffs. Males of annae have a greenish gray throat and a solid green belly. Their tail flags are dark bronzy purple. Females have a white throat and breast heavily spotted with green. Males of addae have a mostly white throat with some green and a white belly with green spots. Their tail flags are greenish black. Like annae, females have a white throat and breast heavily spotted with green.