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

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

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

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

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

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

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...

Peter Cairns / 2020VISION / Sunrise over coastal mudflats with Shelduck feeding (Tadorna tadorna), Campfield Marsh RSPB reserve, Bowness, Solway Firth, Cumbria, UK, April 2011

David Woodfall / Shelduck (Tadorna tadorna) moulting birds at high tide roost, Bridgewater Bay NNR, Severn estuary This is a nationally significant site for this species, Somerset, England, August 2009

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

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