Violet-capped Woodnymph male perched on bird of paradise flower, Atlantic Rainforest, Brazil

The violet capped woodnymph (Thalurania glaucopis) is a species of hummingbird in the family Trochilidae. It is found in forest (primarily humid), dense woodland, gardens and parks in south-eastern Brazil, eastern Paraguay, Uruguay, and far north-eastern Argentina (primarily Misiones Province). Violet-capped Woodnymphs inhabit a wide range of habitats from untouched forests, to scrub, to suburban and city gardens. They gather nectar from both native and non-native flowers and also hunt for insects. During certain parts of the year, Violet-capped Woodnymphs migrate short distances. Males have a bluish violet cap and sparkle with dark green above and gold-green below. Females are dark greenish above and off-white below. During the breeding season, these woodnymphs adorn the outside of their nests with ferns and lichen.

The violet capped woodnymph Forages for nectar at a great variety of native and introduced plants, from low in understorey to canopy level. The male is distinctive, being overall green with a blue cap and deeply forked dark blue tail. It is occasionally confused with the swallow-tailed hummingbird. The female lacks the blue crown, has entirely greyish-white underparts, and a shorter, white-tipped tail. It is widespread and generally common, and therefore considered to be of Least Concern by IUCN.