The Costa Rican Swift is sooty black with a pale gray rump band and lighter throat. On Costa Rica’s southern Pacific side, pairs are seen over forest and open country.
Its plumage is sooty black with a blue gloss. It has narrow wings, a contrasting pale gray band across the rump, and a light gray throat that can look mottled as the feathers wear.
It is resident on the southern Pacific lowlands and slopes of Costa Rica and is usually seen in pairs. Observations include forest, partly cleared areas, pasture, and cultivated land.
It gathers in flocks over forests and open areas and gives twittering calls.
Fresh rump feathers have narrow white edges, while the uppertail coverts are dull black.
An extinction-risk assessment has not been added yet.