Violet-headed hummingbirds are small birds about 8.1 cm (3.2 in) in length with a short, straight bill that averages 13 mm (0.51 in) in length. The head and throat of the male are intense violet or blue with white spots behind each eye that stands out against the dark head. The back is metallic bluish-green and breast is green fading to a grey belly. The tail is green with tiny white-grey tail spots. The wings are black.
The female is duller with a blue cap, green back and grey throat, breast and belly. The wings and tail are the same as the male. The female also has the white spot behind the eye.
The ruby-throated hummingbird ((Archilochus colubris) is a species of hummingbird that generally spends the winter in Central America, Mexico, and Florida, and migrates to Eastern North America for the summer to breed
The black-chinned hummingbird (Archilochus alexandri) is a small hummingbird occupying a broad range of habitats. It is migratory and are found in most of the western United States, reaching north into Canada in Alberta and British Columbia, east to Oklahoma, and as far south as Mexico in the winter.