Anup Shah / Female Gelada baboon (Theropithecus gelada) protecting dead foetus from a Thick billed raven (Corvus crassirostris) Simien Mountains National Park, Ethiopia, November

Andres M. Dominguez/ BIA / Common Tern (Sterna hirundo) flying with fish prey, Danube Delta, Romania

Massimiliano Magnante/ BIA / White Tern (Gygis alba) pair, Bird Island, Seychelles

David Pattyn / Common tern (Sterna hirundo) catching a fish, action shot, Camargue, France, July

Loic Poidevin / Adult Common Tern (Sterna hirundo) hovering over its chicks, one of which has taken a small fish from the adult. Noirmoitier Island, French Atlantic Coast, July.

Loic Poidevin / Common Tern (Sterna hirundo) among nettles. Farne Isles, UK, June.

Mark Hughes / Common Tern (Sterna hirundo) flying, Stockers Lake, Hertfordshire, England

Edwin Giesbers / Common tern (Sterna hirundo) flying through grassland at dusk, Lesbos, Greece

Wild Wonders of Europe / Lundgren / Common tern (Sterna hirundo) in flight, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Peltomäki / Two Common terns (Sterna hirundo) one with fish in its beak, the other calling, Texel, Netherlands, May 2009

Sebastian Kennerknecht / White Tern (Gygis alba) flying over beach, Midway Atoll, Hawaiian Leeward Islands, Hawaii

Sebastian Kennerknecht / White Tern (Gygis alba) chick, Midway Atoll, Hawaiian Leeward Islands, Hawaii

Colin Varndell / Two Common terns {Sterna hirundo} performing courtship display. UK.

Steve Knell / Common tern with chick {Sterna hirundo} UK

Tom Vezo / Common tern {Sterna hirundo} in flight, USA.

Tui De Roy / White Tern (Gygis alba) hovering in search of nest site, Midway Atoll, Hawaii

Loic Poidevin / Common Tern (Sterna hirundo) in flight, Vendee, France. July.

Sergio Hanquet / Common tern (Sterna hirundo) in flight. Tenerife, Canary Islands.

Sergio Hanquet / Common tern (Sterna hirundo). Tenerife, Canary Islands.

David Tipling / Eastern common tern (Sterna hirundo longipennis) two in flight, in non breeding plumage. Vella Lavella, Western Province Solomon Islands.

David Woodfall / Strips of ploughed Machair, farmed by crofters and vital habitat for breeding Little terns (Sterna albifrons ) and Oystercatcher (Haematopus ostralegus) and Dunlin (Calidris alpina). North Uist, Scotl...

Fabrice Cahez / Common tern (Sterna hirundo) Loire river, France, April.

Loic Poidevin / Common terns (Sterna hirundo) pair fighting in flight, Noirmoutier Island, Vendee, France, June.

Robin Chittenden / Common tern (Sterna hirundo) in flight with prey, Norfolk, England, UK. July.

Robin Chittenden / Common tern (Sterna hirundo) Norfolk, England, UK, July.

Werner Bollmann / Common tern (Sterna hirundo) flying looking down to the ground, St. Anna Archipelago, Sweden, May.

Eladio Fernandez / Portrait of a Brown Noddy (Anous stolidus) in Cayos Siete Hermanos, Montecristi, Dominican Republic.

Loic Poidevin / Common tern (Sterna hirundo) perched amongst Yellow water lilies (Nuphar lutea). Danube Delta, Romania. May.

Ernie Janes / Common tern (Sterna hirundo) in flight, Titchwell RSPB reserve Norfolk, England, UK, May.

Loic Poidevin / Common tern (Sterna hirundo) offering fish to mate, Marais Breton, Vendee, France, May

Phil Savoie / Area closed sign, due to nesting birds including Common tern, Least tern, Piping plover, Dennisport, Massachusetts, USA, August.

Oriol Alamany / Brown Noddy (Anous stolidus) on ground, Blinky Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Brown noddy (Anous stolidus) at Blinky Beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / White tern (Gygis alba) group of three, perched with one flapping wings, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia, October 2012.

Oriol Alamany / White tern (Gygis alba), Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia

Oriol Alamany / Brown Noddy (Anous stolidus) on ground, Neds beach, Lord Howe island, Lord Howe Island Group UNESCO Natural World Heritage Site, New South Wales, Australia, October 2012.

Ingo Arndt / Common tern (Sterna hirundo) adult in flight, calling, Danube Delta, Romania

Tui De Roy / Brown noddies (Anous stolidus) sitting on Brown pelican (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) catch escaping fish from Brown pelican (Pelecanus occidentalis) Galapagos

Tui De Roy / Brown noddy (Anous stolidus) sitting on Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) sitting on Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) foraging near Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) sitting on Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) sitting on Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddy (Anous stolidus) sitting on Brown pelicans (Pelecanus occidentalis) to watch for and catch escaping fish. Galapagos

Tui De Roy / Brown noddies (Anous stolidus) preening on rock face, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador.

Tui De Roy / Brown noddies (Anous stolidus) perched on rock face, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador.

Tui De Roy / Brown noddy (Anous stolidus) pair on rock face, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador.

Tui De Roy / Brown noddies (Anous stolidus) in flight over water, Galapagos, Ecuador.

Tui De Roy / Brown noddy (Anous stolidus) pair in courtship display, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador.

Tui De Roy / Brown noddy (Anous stolidus) pair in courtship display, Punta Vicente Roca, Isabela Island, Galapagos, Ecuador.

Sylvain Cordier / White tern (Gygis alba), perched on a branch, Sand island, Midway Atoll National Wildlife Refuge, Hawaii

Sylvain Cordier / White tern (Gygis alba), in flight, Sand island, Midway Atoll National Wildlife Refuge, Hawaii

Martin Gabriel / Fairy Tern (Gygis alba) pair, Cousin Island, Republic of Seychelles

Martin Gabriel / Fairy Tern (Gygis alba), couple, Cousin Island, Republic of Seychelles

Martin Gabriel / Fairy Tern (Gygis alba), Aride Island, Republic of Seychelles

Martin Gabriel / Fairy Tern (Gygis alba), chick, Cousin Island, Republic of Seychelles

Martin Gabriel / Common Tern (Sterna hirundo) in winter plumage, La Digue Island, Republic of Seychelles

Martin Gabriel / Lesser crested tern (Sterna bengalensis) and Common Tern (Sterna hirundo), La Digue Island, Republic of Seychelles

Ralf Kistowski/ BIA / Common Tern (Sterna hirundo) parent feeding chicks, Netherlands

Michael Milicia/ BIA / Common Tern (Sterna hirundo) parent at nest with chicks on beach, Massachusetts

Michael Milicia/ BIA / Common Tern (Sterna hirundo) parent on nest with chicks on beach, Massachusetts

Robin Chittenden / Brown noddy (Anous stolidus) two sitting on coastal rocks, Trinidad and Tobago April

Jose B. Ruiz / Common tern (Sterna hirundo) feeding, Virolahti, Finland, May.

Hanne & Jens Eriksen / Brown noddy (Anous stolidus) on the sea, Oman, November

Laurent Geslin / Common tern (Sterna hirundo) flying, Orleans, France, August.

Cyril Ruoso / Common tern (Sterna hirundo) flying, Lanan Island, Vega archipelago, Norway June

Loic Poidevin / Common tern (Sterna hirundo) in flight with grass for the nest, Brenne, France, May.

Ingo Arndt / Common Tern (Sterna hirundo) flying and calling, Danube Delta, Romania

Matthew Maran / Common tern (Sterna hirundo) pair mating, aggressively calling at another bird, Hampstead Heath, London, England, UK. August.

Matthew Maran / Common tern (Sterna hirundo) group of three perched on posts, Hampstead Heath, London, England, UK. August.

Matthew Maran / Common terns (Sterna hirundo) calling on post, Hampstead Heath, London, England, UK. August.

Matthew Maran / Common tern (Sterna hirundo) with wings extended, Hampstead Heath, London, England, UK. August.

Matthew Maran / Common tern (Sterna hirundo) in flight, Hampstead Heath, England, UK, May.

Wim van den Heever / Common terns (Sterna Hirundo) on beach. Walvisbay, Namibia.

Wim van den Heever / Common Terns (Sterna Hirundo) diving into the waves catching shrimps and other crustations. Walvisbay, Namibia.

Winfried Wisniewski / Common Tern (Sterna hirundo) flying with fish prey, Nijkerk, Netherlands

David Tipling / Black-headed gull (Chroicocephalus ridibundus) mobbing Lesser black-backed gull (Larus fuscus) which was attempting to steal eggs from tern colony. Inner Farne, Farne Islands, Northumberland, UK, May.

David Tipling / Common tern (Sterna hirundo) in flight, Inner Farne, Farne Islands, Northumberland, UK, May.

E.J. Peiker / White Tern (Gygis alba) flying, Hawaii

Matthew Maran / Common tern (Sterna hirundo) in flight, Hampstead Heath, London, UK, July.

Matthew Maran / Common tern (Sterna hirundo) in flight over water, Hampstead Heath, London, UK, August.

Markus Varesvuo / Common tern (Sterna hirundo) on rock with fish in beak, Porvoo Söderskär, Finland, May

Markus Varesvuo / Common tern (Sterna hirundo) on rock, Porvoo Söderskär, Finland, May

Markus Varesvuo / Common tern (Sterna hirundo) in flight with fish in beak, Porvoo Söderskär, Finland, May

Dong Lei / Common Tern (Sterna hirundo) courtship feeding, Ruoergai National Nature Reserve, Sichuan Province, Qinghai-Tibet Plateau, China, Asia

Mick Jenner / Pair of Common terns (Sterna hirundo) mating, Rye Harbour, East Sussex, England, UK, May.

Enrique Lopez-Tapia / Common terns (Sterna hirundo) hunting fish at sea surface, Joao Vieira-Poilao National Marine Park, Guinea-Bissau.

Brent Stephenson / Adult Common tern (Sterna hirundo longipennis) in worn non-breeding plumage. Note that this subspecies always has a black bill, even in breeding plumage. Thursday Island, Torres Strait, Australia. Mar...

Brent Stephenson / Freshly fledged juvenile White tern (Gygis alba) resting on a branch near its nest. Rangiroa, Tuamotu Islands, French Polynesia. September.

Brent Stephenson / Adult Brown noddy (Anous stolidus) in fresh plumage, yawning with bill wide open. Lady Elliot Island, Great Barrier Reef, Australia. March.

Jan Wegener / Common Tern (Sterna hirundo) stretching, Victoria, Australia

Hanne & Jens Eriksen / Brown noddy / Common noddy (Anous stolidus) on buoy, Oman, September

Robin Chittenden / Common tern (Sterna hirundo) in flight, Norfolk, UK, August

Robin Chittenden / Common tern (Sterna hirundo) in flight, Norfolk, UK, August.

Robin Chittenden / Common tern (Sterna hirundo) in flight, Norfolk, UK, August.

Robin Chittenden / Common tern (Sterna hirundo) in flight over sea with fish in beak, Norfolk, UK, August.