A dark swiftlet with a silvery-grey throat that contrasts with its breast. Its feet have three toes.
Its plumage is dark overall, with a silvery-grey throat lighter than the breast. The feathered legs bear three externally visible toes on each foot.
At Losapi Cave, New Guinea, in 1996, echolocating clicks were heard from birds flying in the dark cave. Droppings from captured birds contained moth scales and small insect exoskeletons.
At Losapi Cave, New Guinea, on 18 November 1996, 28 birds were caught while flying out of the cave at 22:30 h.
Between 02:00 and 03:00 h on 18 November 2002, 35 birds were caught flying in darkness just outside Losavi Cave, New Guinea.
The clicks recorded that night occurred in pairs separated by a pause of about 15–22 milliseconds, with the second click louder than the first.
Its three toes and lower legs are robust and appear stouter in live birds than in dried study skins.
An extinction-risk assessment has not been added yet.