A small swiftlet of the Andaman and Nicobar Islands, the Thai–Malay Peninsula and the Greater Sundas, it flies over forests and nearby wooded areas in Singapore.
Adults have a glossy blue-green mantle, a mottled lower breast, a white belly, and a small feather tuft on the hind toe.
In Singapore in October 2017, birds continued foraging near a drain culvert after breeding there had ceased.
In Singapore, cup-shaped nests of plant fibres were fixed to culvert walls and roofs with hardened saliva.
Nests were close together, often forming clusters.
At a Singapore colony on 26 August 2018, 30 of the 98 nests containing chicks held two chicks and 68 held one.
An extinction-risk assessment has not been added yet.