Galápagos Martin

The Galapagos martin is about 15 cm (5.9 in) long. The sexes are dimorphic. Adult males have a glossy dark violaceous steel-blue body. Their wings and tail are black with a faint bluish or greenish sheen. Females have a mostly black head and upperparts with a sooty crown and rump and a strong violaceous steel-blue gloss on the back and scapulars. Their underparts are mostly dark sooty gray or grayish sooty with indistinct pale tips on the feathers. Both sexes have a brown iris, a black bill, and brownish black or dusky brown legs and feet.

The Galapagos martin is found on the central and southern islands of the Galápagos archipeligo but is absent from the five northernmost. It is most common on Isabela and is rare on Española. It has historically inhabited most of the islands' landscapes including built-up areas but is now found mostly in the highlands up to about 1,500 m (4,900 ft) above sea level.

The Galapagos martin feeds on insects captured in mid-air. Though its diet has not been fully described it is known to include moths and butterflies. It is believed to forage in small flocks, primarily low to the ground. Its flight "consists of alternating flaps and glides".