Michael Pitts,Michael Pitts / Sooty Terns (Onychoprion fuscata) flock in flight, Midway Island. Central Pacific.

Brent Stephenson / Sooty Tern (Onychoprion / Sterna fuscatus) seen from below in flight. Mauipihaa (Mopelia), French Polynesia, November.

Tim Laman / Sooty terns (Onychoprion fuscatus) hover over their nesting colony on Teuaua Islet, off Ua Huka Island, Marquesas Islands, French Polynesia.

Hanne & Jens Eriksen / Bridled tern (Onychoprion anaethetus) standing on rock, stretching wing. Oman, June.

Hanne & Jens Eriksen / Bridled tern (Onychoprion anaethetus) in flight. Oman, June.

David Tipling / Bridled tern (Onychoprion anaethetus) in flight. Off Savo Island, Solomon Islands.

Oriol Alamany / Sooty tern (Sterna fuscata) in flight, Neds Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Sooty Tern (Sterna fuscata) in flight, Blinky Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Sooty Tern (Sterna fuscata) in flight, Blinky Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Sooty Tern (Sterna fuscata) in sand, Blinky Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Sooty Tern (Sterna fuscata) on ground, Neds Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Sooty Tern (Sterna fuscata) calling, Neds Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia