A swiftlet of Micronesian islands, with blackish-brown upperparts and dark grey-brown underparts. It nests in caves using plant material and saliva.
It has blackish-brown upperparts, dark grey-brown underparts, and a shallowly forked tail.
It builds its nest in caves using plant material and saliva.
The subspecies on Kosrae and Pohnpei lay one egg, while rukensis on Chuuk lays two.
On Pohnpei, young birds were recorded in cave nests in November and December.
An extinction-risk assessment has not been added yet.