This small hummingbird is found only on Puerto Rico, mainly in mountain forests and shade-grown coffee plantations.
It is about 9–11 cm long. The male is green above and below with a black forked tail and red at the base of the lower mandible. The female is whitish below, has a white-tipped tail, and has an all-black bill.
It defends feeding territories with intense aerial pursuits. Its diet includes nectar, insects, and spiders. It breeds throughout the year, with breeding concentrated from February to May.
An extinction-risk assessment has not been added yet.