David Tipling / Black-naped tern (Sterna sumatrana) Alphone Atoll Seychelles

Tim Laman / Black-naped terns (Sterna sumatrana) gather at a driftwood log near their nest colony. Getullai Island, Torres Strait Islands, Queensland, Australia.

Willem Kolvoort / Black-naped terns (Sterna sumatrana) on a coral 'mushroom' in Passe Femme / Femme channel, Natural World Heritage Site, Aldabra

Willem Kolvoort / Black-naped terns (Sterna sumatrana) flying above a coral 'mushroom' in Passe Femme / Femme channel, Natural World Heritage Site, Aldabra

Aflo / Black naped tern (Sterna sumatrana) in flight over Kondoi beach, Taketomi Island, Okinawa, Japan, September 2010.

Brent Stephenson / Black-naped Tern (Sterna sumatrana) perched on a stick. Farquhar, Seychelles.

Brent Stephenson / Black-naped Tern (Sterna sumatrana mathewsi) standing on a rock. Aldabra Atoll, Seychelles.

Brent Stephenson / Black-naped Tern (Sterna sumatrana) perched on raised coral. Fulaga, Southern Lau Group, Fiji, November.

David Fleetham / Eggs of Black naped terns (Sterna sumatrana mathewsi), Fiji.

David Fleetham / Black naped terns (Sterna sumatrana mathewsi) on rock, Fiji.

David Fleetham / Black naped tern (Sterna sumatrana mathewsi) in flight, Fiji.

David Fleetham / Black naped tern (Sterna sumatrana mathewsi) in flight, Fiji.

Aflo / Black naped terns (Sterna sumatrana mathewsi) on rock sticking out of sea, Miyakojima, Miyako Island, Okinawa Prefecture, Japan

Nature Production / Black-naped Tern {Sterna sumatrana} and Roseate tern {Sterna dougallii} flying in mixed flock, Okinawa, Japan, July

Martin Willis / Black-naped Tern (Sterna sumatrana) calling, Great Barrier Reef, Queensland, Australia

Martin Willis / Black-naped Tern (Sterna sumatrana) landing, Great Barrier Reef, Queensland, Australia

Martin Willis / Black-naped Tern (Sterna sumatrana) juvenile flying, Great Barrier Reef, Queensland, Australia