Pal Hermansen / Eider ducks (Somateria molissima) flock taking off from sea, Trondelag, Norway, January.

Staffan Widstrand / King eider duck (Somateria spectabilis) male, Batsfjord village harbour, Varanger Peninsula, Norway. March.

Staffan Widstrand / Steller's eider duck (Polysticta stelleri) Batsfjord village harbour with red reflections on the water, Varanger Peninsula, Norway, March.

Staffan Widstrand / King eider duck (Somateria spectabilis) male, Batsfjord village harbour, Varanger Peninsula, Norway.

Sven Zacek / Eider ducks (Somateria mollissima) males reflected in a small pond, Longyearbyen, Svalbard, Norway. June.

Espen Bergersen / Male King eiders (Somateria spectabilis) three taking-off from water. Batsfjord, Norway, March.

Espen Bergersen / Adult male King eider (Somateria spectabilis) close up portrait, Batsfjord, Norway, March.

Espen Bergersen / Adult male King eider (Somateria spectabilis) portrait, Batsfjord, Norway, March.

Espen Bergersen / Adult male King eider (Somateria spectabilis) portrait from behind also showing triangular black sails on the back and white sides of rump. Batsfjord, Norway, March.

Espen Bergersen / Male Steller's eider (Polysticta stelleri) drinking on water with reflections of nearby buildings. Batsfjord, Norway. March.

Markus Varesvuo,Markus Varesvuo / Flock of Steller's eiders (Polysticta stelleri) in flight, Batsfjord, Norway, March.

Markus Varesvuo,Markus Varesvuo / Male King eider (Somateria spectabilis) surfacing, Batsfjord, Norway, March.

Markus Varesvuo / Male King eider (Somateria spectabilis) in flight over water, Batsfjord, Norway, March.

Markus Varesvuo,Markus Varesvuo / Male King eider (Somateria spectabilis) displaying, Norway, February.

Juan Carlos Munoz / Group of male Common eiders (Somateria mollissima) in flight, Iceland, June.

MIKE POTTS,Mike Potts / Stellers Eider (Polysticta stelleri) a small group in flight, near Vardo. North Norway, March.

Fergus Gill / 2020VISION / Female Eider (Somateria mollissima) swimming on sea, Outer Hebrides, Scotland, UK, June.

Mark Hamblin / 2020VISION / Eider (Somateria mollissima) male in flight in evening light. Aberdeenshire, Scotland, UK, March.

Mark Hamblin / 2020VISION / Male Eider (Somateria mollissima) in flight over water, Aberdeenshire , Scotland, UK, February. 2020VISION Book Plate. Did you know? The eider was one of the first ducks to be protected by law, establ...

Ben Hall / Eider (Somateria mollissima) male swimming, Northumberland, UK

Erlend Haarberg / Eider ducks (Somateria mollissima) taking off from water, Norway, January

Markus Varesvuo / Eider (Somateria molisima) male head profile, Finland May

Jeff Wilson / View through the porthole of science teams and Frozen Planet film crew working on the sea ice in the Bering Sea, Alaska, USA, March 2008. The film crew were in search of Spectacled eider ducks, temper...

Bernard Castelein / Common Eider (Somateria mollissima) female with chicks walking up beach from water, Helgoland, Germany, May

Bernard Castelein / Common Eider (Somateria mollissima) chick on beach, Helgoland, Germany, May

Eric Baccega / King Eider (Somateria spectabilis) flying low over water. Floe edge, Arctic Bay, Nunavut, Canada, April.

Wild Wonders of Europe / O. Haarberg / Four Eider ducks (Somateria mollissima) flying over sea, Kallskär, Stockholm Archipelago, Sweden, June 2009

Wild Wonders of Europe / O. Haarberg / Eider ducks (Somateria mollissima) on sea, Kallskär, Stockholm Archipelago, Sweden, June 2009

Guy Edwardes / Eider (Somateria mollissima) male on water, stretching, Seahouses, Northumberland, England, February

Guy Edwardes / Eider (Somateria mollissima) male on water, Seahouses, Northumberland, England, February

Guy Edwardes / Eider (Somateria mollissima) male taking off from water, Seahouses, Northumberland, England, February

Edwin Giesbers / Two male Eider ducks (Somateria mollissima) Heligoland, Germany

Kim Taylor / Eider (Somateria mollissima) drake, captive, Sussex, England

Orsolya Haarberg / Common eider (Somateria mollissima) male. Jökulsárlón glacial lagoon. Iceland. June 2008

Orsolya Haarberg / Common eider (Somateria mollissima) male. Jökulsárlón glacial lagoon. Iceland. June 2008

Wild Wonders of Europe / O. Haarberg / Common eider (Somateria mollissima) pair, Jökulsárlón glacial lagoon, Iceland, June 2008

Markus Varesvuo / King Eider (Somateria spectabilis) male taking off from water, Norway, April. Magic Moments book plate.

Markus Varesvuo / Steller's Eider (Polysticta stelleri) ducks, males and females, in flight. Norway, March

Markus Varesvuo / King Eider (Somateria spectabilis) duck male on water. Norway. April

Pete Cairns / Common Eider duck (Somateria mollissima) male taking off from water, Nord-Trondelag, Norway

Laurent Geslin / Eider duck {Somateria mollissima} on water flapping its wings, UK.

Thomas Hinsche / Common Eider (Somateria mollissima) female, Schleswig-Holstein, Germany

Flip de Nooyer / Common Eider (Somateria mollissima) adult female at down nest with eggs, Europe

John Shaw / Common eider duck (Somateria mollissima) female defending her nest from arctic fox (Vulpes lagopus). Longyearbyen, Spitsbergen. June.

John Shaw / Arctic fox (Vulpes lagopus) carrying Common eider duck egg (Somateria mollissima) after raiding nesting colony. Longyearbyen, Spitsbergen, Svalbard, Norway. June.

SCOTLAND: The Big Picture / Orca (Orcinus orca) hunting an Eider duck (Somateria mollissima) chick , Shetland, Scotland, UK, July.

SCOTLAND: The Big Picture / Killer whale (orca) hunting an Eider chick (Somateria mollissima), Shetland, Scotland, UK, July.

Pal Hermansen / King eider duck (Somateria spectabilis), males swimming in same direction. Finnmark, Norway. March.