Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS, GDT 2011 competition

John Chan / California brown pelicans (Pelecanus occidentalis californicus) roosting on a mudflat, with a flock of Elegant terns (Thalasseus elegans) nearby, Southern California, USA May/2019

David Woodfall / Two Little terns (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Little tern (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Little tern (Sterna albifrons) with newly hatched chick, Gronant dunes, Denbighshire, Wales, UK, June.

David Woodfall / Little tern (Sterna albifrons ) feeding sand eel (Hyperoplus spp) to young chick. Gronant Dunes, Denbighshire, Wales, UK, June.

David Woodfall / Little tern (Sterna albifrons) nest with three eggs in shingle ridge. County Wicklow, Ireland, June.

Marie Read / Arctic terns (Sterna paradisaea), two in flight over nesting colony in field of buttercups (Ranunculus sp.), Keflavik, Iceland. Digital canvas expansion.

George Sanker / Arctic tern (Sterna paradisaea), two fighting in mid-air. Machias Seal Island, New Brunswick / Maine, Canada / USA. July.

John Chan / Juvenile California least tern (Sternula antillarum browni) begging for food from a decoy, used to attract breeding pairs to deserted nest sites, Huntington Beach, California, USA, June.

John Chan / California least tern chick (Sternula antillarum browni) falling over as it runs towards its parent returning to nest site, Huntington Beach, California, USA, June.

John Chan / Male California least tern (Sternula antillarum browni) presenting fish offering to female during mating, Huntington Beach, California, USA, May.

John Chan / Elegant terns (Thalasseus elegans) courting, Southern California, USA, March.

John Chan / Elegant tern (Thalasseus elegans) with a broken wing, attempting to take off, Southern California, USA, April.

John Chan / Western gulls (Larus occidentalis) attacking an Elegant tern (Thalasseus elegans) with a broken wing, Southern California, USA, April.

Pedro Narra / Little Tern (Sterna albifrons) feeding chick, Sado Estuary, Portugal. June

John Chan / Male California Least Tern (Sternula antillarum browni) courting a female, presenting a fish before chasing off another male, Huntington Beach, California, USA, May.

Ann & Steve Toon / Arctic tern (Sterna paradisaea) with sandeel. Inner Farne, Northumberland, UK. July.

Sven Zacek / Arctic tern (Sterna paradisea) sitting on its nest surrounded by various coastal colors. Harjumaa, Estonia. June.

Ole Jorgen Liodden / Arctic tern (Sterna Paradisaea) flying, Svalbard, Norway, July.

Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA

Markus Varesvuo,Markus Varesvuo / Whiskered tern (Chlidonias hybridus), Hungary, June.

Markus Varesvuo,Markus Varesvuo / Whiskered tern (Chlidonias hybridus), Hungary, June.

Markus Varesvuo,Markus Varesvuo / Whiskered tern (Chlidonias hybridus), Hungary, June.

Theo Bosboom,Theo Bosboom / Arctic tern (Sterna paradisae) on telegraph lines, near a small village on the Reykjanes peninsula in the south west of Iceland, June

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

Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) in flight, Svalbard, Norway, July. Highly commended, BIRDS category, GDT 2011 competition

Edwin Giesbers / Arctic tern (Sterna paradisaea) in flight, vocalising, aggresive behaviour, Farne Islands, Northumberland, UK, June

Edwin Giesbers / Arctic tern (Sterna paradisaea) Farne Islands, Northumberland, UK, June

Edwin Giesbers / Arctic tern (Sterna paradisaea) in flight, calling, Farne Islands, Northumberland, UK, June

Edwin Giesbers / Arctic tern (Sterna paradisaea) in flight, Farne Islands, Northumberland, UK, June

Luiz Claudio Marigo / Lesser black noddies {Anous tenuirostris} nesting, silhouetted, Noronha Is, Brazil

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

Alan Murphy/ BIA / Forster's Tern (Sterna forsteri) flying, Texas

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

Bruno de Faveri / Arctic Tern (Sterna paradisaea) with begging chick, Farne Islands, England, United Kingdom

Duncan Usher / Sandwich Tern (Thalasseus sandvicensis) flying with sand eel in beak, Texel, Holland

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

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

Tim Fitzharris / Sandwich Tern (Thalasseus sandvicensis) couple courting, North America

Michael Quinton / Arctic Tern (Sterna paradisaea) flying, Alaska

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

Mitsuaki Iwago / Arctic Tern (Sterna paradisaea) flying overhead, Arctic

Jim Brandenburg / Black Tern (Chlidonias niger) flying over prairie slough, North Dakota

Oscar Dewhurst / Arctic tern ((Sterna paradisaea) adult calling perched on man's head while he takes a selfie with mobile phone. Farne Islands, Northumberland, UK. July

Oscar Dewhurst / Arctic tern ((Sterna paradisaea) adult calling perched on rocks. Farne Islands, Northumberland, UK. July.

Oscar Dewhurst / Arctic tern (Sterna paradisaea) in flight. Farne Islands, Northumberland, UK. July