In Thai: นกนางนวลแกลบท้ายทอยดำ, nok naang-nuan klaep thai-thoy dam
Binomial name: Sterna sumatrana, Thomas Stamford Raffles, 1822
The black-naped tern (Sterna sumatrana) is an oceanic tern mostly found in tropical and subtropical areas of the Pacific and Indian Oceans. It is rarely found inland.
The tern is about 30 cm long with a wing length of 21–23 cm. Their beaks and legs are black, but the tips of their bills are yellow. They have long forked tails. The black-naped tern has a white face and breast with a grayish-white back and wings. The first couple of their primary feathers are gray.
There are two listed subspecies:
- S. s. mathewsi (Stresemann, 1914) – islands of the western Indian Ocean
- S. s. sumatrana (Raffles, 1822) – islands of the eastern Indian Ocean through to the western Pacific & Australasia
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- Sterna sumatrana
- English: Black-naped tern
- French: Sterne diamant
- Thai: นกนางนวลแกลบท้ายทอยดำ, nok naang-nuan klaep thai-thoy dam
Sterna sumatrana mathewsi, Erwin Stresemann, 1914
Range: Islands of the western Indian Ocean
Sterna sumatrana sumatrana, Thomas Stamford Raffles, 1822
Range: Islands of the eastern Indian Ocean through to the western Pacific & Australasia
Least Concern (IUCN3.1)