David Pattyn / Tufted duck (Aytha fuligula) female portrait.The Netherlands. April..

David Pattyn / Tufted duck (Aytha fuligula) portrait of a male in breeding plumage. The Netherlands. April..

Jan Wegener / White-eyed Duck (Aythya australis) male flapping, Australia

Laurent Geslin / Tufted Duck (Aythya fuligula) flock overwintering on Lake Leman / Geneva with city in background, Switzerland

Laurent Geslin / Male tufted duck (Aythya fuligula) on water. Walthamstow reservoir, London, UK

Steve Gettle / Ring-necked Duck (Aythya collaris) male flying, Island Lake Recreation Area, Michigan

George Sanker / Lesser Scaup (Aythya affinis) female walking across ice. Yellowstone National Park, Wyoming, USA, June.

Inaki Relanzon / Madagascar Pochard (Aythya innotata) on water. One of the most endangered ducks in the world, rediscovered in 2008. Bemanevika protected area, north Madagascar, Africa.

Fergus Gill / Tufted duck (Aythya fuligula) male on a loch, with others in the background. Scotland, January

Andrew Parkinson / Tufted duck (Aythya fuligula) male on a tranquil lake in dawn mist. Derbyshire, UK, May. (non-ex)

Steve Knell / Tufted duck (Aythya fuligula) drake on water with Midges (Chironomidae) Iceland. June

Colin Varndell / Drake Tufted duck (Aythya fuligula) in breeding plumage, Gloucestershire, UK, February