This small, sooty-colored swift catches insects while flying above forests and forest edges.
Its body is sooty brown, with a paler rump.
It is almost always in flight and catches flying insects above forests and forest edges.
A 1963 Trinidad nest was a shallow twig half-saucer attached about 20 cm below the top of a concrete shaft.
That nest held two eggs on 17 May; one hatched on 3 June and the other on 4 June.
Fresh plumage has a green sheen that turns bluish-purple with wear and eventually becomes dull blackish-brown.
On 4 June the chicks, under 48 hours old, were naked and flesh-pink, with whitish egg teeth on the upper bill tip.
An extinction-risk assessment has not been added yet.