This martin is about 15 cm long. Males are almost entirely black with a blue sheen, while females are duller brown. It catches flying insects in the Galapagos and nests near cliffs and mangroves.
It is about 15 cm long. Males are nearly all black with a bluish sheen and slightly paler underwings; females are similar but have a duller dark-brown back. The wings are pointed and the narrow tail has a shallow fork.
It catches insects in flight. It is found mainly near mangroves and cliffs along the coast or around highland volcano rims, and nests in holes and crevices from August to March.
An extinction-risk assessment has not been added yet.