Terry Whittaker / Mandarin duck (Aix galericulata) male female pair, Reddish Vale Country Park, Greater Manchester, UK. December

Russell Cooper / Mandarin duck drake (Aix galericulata) on the water, showing orange 'sail' feathers which are used when displaying, Southwest London, UK, March.

Russell Cooper / Mandarin duck drake (Aix galericulata) from behind flapping its wings. Southwest London, UK. February.

Florian Möllers / Mandarin duck (Aix galericulata) rear view of drake in breeding plumage, displaying, Berlin, Germany.

Konrad Wothe / Mandarin Duck (Aix galericulata) male and female standing in water, China

Oscar Dewhurst / Mandarin duck (Aix galericulata) reflected in water. Richmond Park, London, England, UK.

Ernie Janes / Portrait of a Mandarin duck (Aix galericulata) male animal and female. UK. Introduced species.

Ernie Janes / Portrait of a Mandarin duck (Aix galericulata) male animal. UK. Introduced species.

Heather Angel / Mandarin duck (Aix galericulata) pair mating on lake. Shanghai Zoo, China.

Russell Cooper / Mandarin duck drake (Aix galericulata) on the water Southwest London, UK, April.

Russell Cooper / Mandarin duck drake (Aix galericulata) on the water Southwest London, UK, April.

Russell Cooper / Mandarin duck drake (Aix galericulata) on a tree branch eating lichen, Southwest London, UK, April.

Russell Cooper / Mandarin duck drake (Aix galericulata) floating on the water, Southwest London, UK, March.

Russell Cooper / Mandarin duck drake (Aix galericulata) in courtship display, Southwest London, UK, March.

Russell Cooper / Mandarin duck drake (Aix galericulata) runnng across the water surface. Southwest London, UK, March.

Russell Cooper / Mandarin duck (Aix galericulata) female floating on an open patch of water on a frozen pond. Southwest London, UK, February.

Russell Cooper / Mandarin duck drake (Aix galericulata) floating on an open patch of water on a frozen pond, Southwest London, UK, February.

Russell Cooper / Mandarin duck drake (Aix galericulata) floating on an open patch of water on a frozen pond, Southwest London, UK. February.

Russell Cooper / Mandarin duck drake (Aix galericulata) walking on ice across a frozen pond, Southwest London, UK, December.

Russell Cooper / Mandarin duck drake (Aix galericulata) walking on ice across a frozen pond, Southwest London, UK, December.

Russell Cooper / Mandarin duck female (Aix galericulata) floating on colourful water, Southwest London, UK, November.

Russell Cooper / Mandarin duck drake (Aix galericulata) swimming through a reedbed, Southwest London, UK, November.

Russell Cooper / Mandarin duck (Aix galericulata) wing flapping, Southwest London, UK, November.

Russell Cooper / Mandarin duck (Aix galericulata) female bathing taking a bath, Southwest London, UK, November.

Russell Cooper / Mandarin duck drake (Aix galericulata) floating on colourful water, Southwest London, UK, January.

Paul Hobson / Mandarin duck (Aix galericulata) male eating young Elm (Ulmus sp) seeds in tree. Derbyshire, England, UK. April.

Paul Hobson / Mandarin duck (Aix galericulata) female perched in tree. Derbyshire, England, UK. April.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male swimming on water in the Beijing area, China. May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male swimming on water in the Beijing area, China, May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male surfacing, Beijing area, China, May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male swimming on water in the Beijing area, China, May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male swimming on water in the Beijing area, China, May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male swimming on water in the Beijing area, China, May.

Staffan Widstrand / Wild Wonders of China / Mandarin duck (Aix galericulata) male displaying on water in the Beijing area, China, May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male female pair, Vladivostock, Primorsky Krai, Far East Russia. May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male female pair, Vladivostock, Primorsky Krai, Far East Russia. May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male, Vladivostock, Primorsky Krai, Far East Russia. May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male with female in water, Vladivostock, Primorsky Krai, Far East Russia. May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male female pair, Vladivostock, Primorsky Krai, Far East Russia. May.

Valeriy Maleev / Mandarin duck (Aix galericulata) male flapping wings, Vladivostock, Primorsky Krai, Far East Russia. May.

Jussi Murtosaari / Mandarin duck (Aix galericulata), male in summer, Finland, September

Ralf Kistowski/ BIA / Mandarin Duck (Aix galericulata) male, North Rhine-Westphalia, Germany

Vladimir Medvedev / Mandarin duck (Aix galericulata) male and female on water, Lazo reserve, Sikhote Alin UNESCO Natural World Heritage Site, Primorskiy krai, Far East Russia. April.

Dave Bevan / Male Mandarin duck (Aix galericulata) preening at waters edge, Ceredigion, Wales, UK, February.

Mike Read / Mandarin duck (Aix galericulata) males and females on ice, Eyeworth Pond, New Forest National Park, Hampshire, England, UK, February 2016.

David Tipling / Mandarin duck (Aix galericulata) male on branch, Arundel, UK, April.

Sebastian Kennerknecht / Mandarin Duck (Aix galericulata) drake bathing, Potsdam, Brandenburg, Germany

Ernie Janes / Mandarin (Aix galericulata) male. UK, April.

Ernie Janes / Mandarin (Aix galericulata) male on water. UK, April.

Dong Lei / Mandarin Ducks (Aix galericulata) swimming,Tangjiahe National Nature Reserve, Sichuan Province, China, Asia

Andy Rouse / Mandarin Duck (Aix galericulata) male on lake, UK, April.

Andy Rouse / Mandarin Duck (Aix galericulata) male on lake, UK, April.

Andy Rouse / Mandarin Duck (Aix galericulata) male on lake, UK, April.

Christine Jung / Mandarin Duck (Aix galericulata) female, Baden-Wurttemberg, Germany

Rosl Roessner / Mandarin Duck (Aix galericulata) chicks

Paul Hobson / Mandarin duck (Aix galericulate) male resting in tree, Sheffield, UK May

Paul Hobson / Mandarin duck (Aix galericulate) male resting in tree, Sheffield, UK May

Paul Hobson / Mandarin duck (Aix galericulate) male resting in tree, Sheffield, UK May

XI ZHINONG / Mandarin duck (Aix galericulata) female with ducklings, Beijing Zoo, Beiijing China, June

XI ZHINONG / Mandarin duck (Aix galericulata) female with ducklings, Beijing Zoo, Beiijing China, June

XI ZHINONG / Mandarin duck (Aix galericulata) female, swimming, Beijing Zoo, Beiijing China, June

XI ZHINONG / Mandarin duck (Aix galericulata) female with ducklings, Beijing Zoo, Beiijing China, June

Tim Fitzharris / Mandarin Duck (Aix galericulata) male and female, Jurong Bird Park, Singapore

Tim Fitzharris / Mandarin Duck (Aix galericulata) males competing over female, Jurong Bird Park, Singapore

Colin Varndell / Mandarin duck (Aix galericulata) drake, Slimbridge, Gloucestershire, UK, March

Michel Poinsignon / Mandarin duck (Aix galericulata) male flying over water, Moselle, Lorraine, France, January.

Michel Poinsignon / Mandarin duck (Aix galericulata) male on water Moselle, Lorraine, France, January.

Colin Varndell / Mandarin duck (Aix galericulata) drake on water, Gloucestershire, UK, March

Steve Gettle / Mandarin Duck (Aix galericulata) male, Battle Creek, Michigan

Florian Möllers / Mandarin duck (Aix galericulata) female with ducklings on river bank, Berlin, Germany, May

Florian Möllers / Mandarin duck (Aix galericulata) female with ducklings on river bank, Berlin, Germany, May

Florian Möllers / Mandarin duck (Aix galericulata) drake in breeding plumage, Berlin, Germany.

Florian Möllers / Mandarin duck (Aix galericulata) female on water with ducklings, Berlin, Germany, May

Edwin Giesbers / Mandarin Duck (Aix galericulata) male on water. The Netherlands, June.

Colin Varndell / Mandarin drake (Aix galericulata), Dorset, UK, March.

Konstantin Mikhailov / Mandarin duck (Aix galericulatus) male on water, Captive

Shin Yoshino / Mandarin Duck (Aix galericulata) with reflection, Japan

Alan Williams / Mandarin duck (Aix galericulata) male displaying in breeding plumage, feral bird, introduced species, Norfolk, UK, March

Alan Williams / Mandarin duck (Aix galericulata) male in breeding plumage, feral bird, introduced species, Norfolk, UK, March

Konrad Wothe / Mandarin Duck (Aix galericulata) male, Bavaria, Germany

Kerstin Hinze / Mandarin Duck (Aix galericulata) male chasing away another male in the water, Leipzig, Germany

Graham Eaton / Mandarin duck (Aix galericulata) drake on water, Wirral, UK, April

Graham Eaton / Mandarin Duck (Aix galericulata) drake exhibiting submissive behaviour towards another drake, Wirral, UK, April

Graham Eaton / Mandarin Duck (Aix galericulata) drakes exhibiting homosexual behaviour, Wirral, UK, April

Nature Production / Mandarin duck {Aix galericulata} female incubating eggs on nest in tree, Aomori, Japan, June

Graham Eaton / Mandarin Duck (Aix galericulata) preparing to clean its wings, UK, 2007

Graham Eaton / Male Mandarin Duck (Aix galericulata) UK 2006

Graham Eaton / Male Mandarin Duck (Aix galericulata) UK 2006

Graham Eaton / Male Mandarin duck (Aix galericulata) UK, 2007

David Kjaer / Male (Drake) Mandarin Duck (Aix galericulata), captive, UK

David Kjaer / Male (Drake) Mandarin Duck (Aix galericulata) captive, UK

Rod Williams / Mandarin duck {Aix galericulata} female with ducklings, captive, from Asia, introduced to UK

David Kjaer / Mandarin duck on water (Aix galericulata) Sussex, UK

George McCarthy / Mandarin Duck {Aix galericulata} female, Sussex, UK

David Kjaer / Female mandarin duck (Aix galericulata) on water

Christoph Becker / Mandarin drake (Aix galericulata)