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

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

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

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

Oriol Alamany / Rock paintings of Terns (Sterna sp) at Ana Kai Tangata cave, Easter Island (Pascua or Rapa Nui), Pacific Island, Unesco World Heritage Site, November 2004

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

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

Alan Murphy/ BIA / Least Tern (Sterna antillarum) with fish prey, Texas

Alan Murphy/ BIA / Arctic Tern (Sterna paradisaea) group flying, Iceland

Alan Murphy/ BIA / Arctic Tern (Sterna paradisaea) approaching in densive posture, Iceland

Yva Momatiuk & John Eastcott / Arctic Tern (Sterna paradisaea) group flying, Haganesvik, Iceland

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

Michael Milicia/ BIA / Least Tern (Sterna antillarum) with fish prey, North America

Michael Milicia/ BIA / Least Tern (Sterna antillarum) male offering fish to female during courtship, Massachusetts

Michael Milicia/ BIA / Least Tern (Sterna antillarum) spreading wings, North America

Michael Milicia/ BIA / Least Tern (Sterna antillarum) pair courting, Massachusetts

Michael Milicia/ BIA / Least Tern (Sterna antillarum) pair mating, North America

Michael Milicia/ BIA / Least Tern (Sterna antillarum) male presenting fish to female, North America

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

Sebastian Kennerknecht / Forster's Tern (Sterna forsteri), Elkhorn Slough, Monterey Bay, California

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

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

Winfried Wisniewski / Arctic Tern (Sterna paradisaea) group foraging, Snaefellsnes Peninsula, Iceland

Glenn Bartley / Arctic Tern (Sterna paradisaea) flying, Manitoba, Canada

E.J. Peiker / Arctic Tern (Sterna paradisaea), Manitoba, Canada

Markus Varesvuo / Great skua (Catharacta / Stercorarius skua) in flight carrying dead Tern (Sterna sp) Iceland, June

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

Robert Royse / Arctic Tern (Sterna paradisaea) feeding on fish, Manitoba, Canada

Mathias Schaef / Lesser Crested Tern (Sterna bengalensis), Oman

Duncan Usher / Arctic Tern (Sterna paradisaea) feeding chick in flight, Iceland

Duncan Usher / Common Tern (Sterna hirundo) flying, Texel, Holland

Thomas Hinsche / Common Tern (Sterna hirundo) trio, Texel, Netherlands

Glenn Bartley / Arctic Tern (Sterna paradisaea) carrying fish prey, Manitoba, Canada

Matthew Studebaker / Arctic Tern (Sterna paradisaea), Manitoba, Canada

Thomas Hinsche / Pied Avocet (Recurvirostra avosetta) aggressing a Common Tern (Sterna hirundo), Texel, Netherlands

Ralph Martin / Arctic Tern (Sterna paradisaea) carrying fish prey, Schleswig-Holstein, Germany

Jan Wegener / Forster's Tern (Sterna forsteri), Texas

Alan Murphy / Gull-billed Tern (Gelochelidon nilotica), Texas

Glenn Bartley / Arctic Tern (Sterna paradisaea), Manitoba, Canada

Glenn Bartley / Arctic Tern (Sterna paradisaea) pair flying, Manitoba, Canada

Cyril Ruoso / Arctic Tern (Sterna paradisaea) group on iceberg in Jokulsarlon Lagoon, Iceland

Cyril Ruoso / Arctic Tern (Sterna paradisaea) mini GPS recorder, Flatey Island, Iceland

Martin Willis / Great Crested-Tern (Sterna bergii) parent bringing food for chick, Wilsons Promontory National Park, Victoria, Australia

Sebastian Kennerknecht / Great Crested-Tern (Sterna bergii) flying, Hawf Protected Area, Yemen

Jonathan Harrod / White-fronted Tern (Sterna striata) male presenting a fish as part of courtship display, Avon Heathcote Estuary, Christchurch, New Zealand

Jonathan Harrod / White-fronted Tern (Sterna striata) pair mating, Avon Heathcote Estuary, Christchurch, New Zealand

Jonathan Harrod / White-fronted Tern (Sterna striata) presenting a fish as part of courtship display, Avon Heathcote Estuary, Christchurch, New Zealand

Steve Gettle / Common Tern (Sterna hirundo) pair fighting, Nickerson County Beach Park, New York

Steve Gettle / Common Tern (Sterna hirundo) carrying fish prey, Nickerson County Beach Park, New York

Steve Gettle / Common Tern (Sterna hirundo) carrying fish prey, Nickerson County Beach Park, New York

Matthias Breiter / Arctic Tern (Sterna paradisaea) protecting ground nest and eggs, Yakutat, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) ground nest with two eggs, Yakutat, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) flying, Yakutat, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) calling in flight, Yakutat, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) calling while flying, Yakutat, Alaska

Matthias Breiter / Arctic Tern (Sterna paradisaea) flying, Yakutat, Alaska

Ingo Arndt / Antarctic Tern (Sterna vittata), King Edward Point, South Georgia Island

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

Sergey Gorshkov / Arctic Tern (Sterna paradisaea) in defensive display, while other adult is incubating eggs on nest, Volga Delta, Russia

Chris Gomersall / Arctic tern (Sterna paradisaea) with Sandeel (Ammodytes sp) Northumberland, England, May

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Two Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Group of Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Graham Eaton / Sandwich Tern (Sterna / Thalasseus sandvicensis) fishing for sandeel (Ammodytes sp) Anglesey, Wales, UK, June

Colin Monteath / White-fronted Tern (Sterna striata) colony, Shag Point, North Otago, New Zealand

Matthias Breiter / Arctic Tern (Sterna paradisaea) chick begging for food, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) feeding fish to chick, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) at nest with eggs, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) hovering, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) offering fish to potential mate, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) skimming water surface to catch fish, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) with fish, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair courting in mid-air, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) at nest with two chicks, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) parent feeding fish to chick, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) chick only a few days old, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair taking flight from rock, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair at nest site, Hudson Bay, Canada

Matthias Breiter / Arctic Tern (Sterna paradisaea) pair at nest site, Hudson Bay, Canada