Cinnamon-sided hummingbird

The cinnamon-sided hummingbird (Ramosomyia wagneri) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is endemic to the Mexican state of Oaxaca.

The cinnamon-sided hummingbird is 10 to 11.5 cm (3.9 to 4.5 in) long and weighs about 6.3 g (0.22 oz). Both sexes have a red bill with a black tip. Adult males have a glittering bluish green crown, an emerald to bronze green nape and back, and grayish brown to bronze rump and uppertail coverts. Their tail is coppery to purplish with bronze green edges to the feathers. Their underside from throat to undertail coverts is pure white with the eponymous cinnamon sides and flanks. Adult females are similar, though with a dark green crown and a bronze green to golden green tail.