- Sterna sumatrana
- White face and breast
- Greyish-white back and wings
- Black nape band
- Black spot in front of eye
- Black bill with yellow tip
- Black legs and feet
- Brown iris
- Long forked tail
Young birds: mottled brown crown, blackish mottling on nape.
Juvenile: nape and sides of head greyish brown, brownish upperparts with buff and grey scallops, whitish rump, rounded tail, yellow bill and feet.
There are 2 subspecies:
- S. s. sumatrana:
- S. s. mathewsi:
- Aldabra, Amirante, Chagos and Maldive islands
Sea coasts, mudflats and harbours. It is rarely found inland.
The nest is a ground scrape in the sand or gravel on rocky islets. The clutch consists of 1 or 2 eggs.
Voice: sharp tsii-chee-chi-chip
Alarm call: chit-chit-chitrer
- Clements, JF. 2009. The Clements Checklist of Birds of the World. 6th ed., with updates to December 2009. Ithaca: Cornell Univ. Press. ISBN 978-0801445019.
- Andaman Birdwatching
- BirdForum Opus contributors. (2021) Black-naped Tern. In: BirdForum, the forum for wild birds and birding. Retrieved 23 January 2021 from https://www.birdforum.net/wiki/Black-naped_Tern