Markus Varesvuo / Small flock consisting of three male and one female Gadwall (Anas strepera) in flight, Hungary, May

Terry Whittaker / 2020VISION / Gadwall (Anas strepera) female duck stretching wings on Rutland Water, Rutland, UK, April

Graham Eaton / Rear view of Gadwall (Anas strepera) drying its wings, London Wetland Centre, UK, August

Philippe Clement / Male Gadwall {Anas strepera} Belgium

Tim Fitzharris / Gadwall (Anas strepera) female taking flight from water, New Mexico

Roger Powell / Gadwall pair (Mareca strepera) swimming in tandem. Potterick Carr Nature Reserve, Doncaster, Yorkshire, England, UK, March.

Mike Read / Reedbeds and pools with wildfowl including Mallard (Anas platyrhynchos), Gadwall (Anas strepera), Little egret (Egretta garzetta) and Coot (Fulica atra). From Avalon hide, Ham Wall RSPB Reserve, Avalo...

Nick Upton / Gadwall (Anas strepera) drake swimming past reeds in flooded marsh, RSPB Greylake, Somerset, UK, January.

David Pattyn / Gadwall (Anas strepera), Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

David Tipling / Pied avocet (Recurvirostra avosetta) adult leading away a Gadwall (Anas strepera) from its nest North Norfolk, England, UK. May

Mike Read / Gadwall (Anas strepera) male resting on vegetation in lake, Quinta do Lago, Ria Formosa Nature Reserve, Algarve, Portugal, February.

Jussi Murtosaari / Gadwall (Anas strepera), adult female in water, Finland, April.

Jussi Murtosaari / Gadwall (Anas strepera), adult male, Finland, May.

Jussi Murtosaari / Gadwall (Anas strepera), adult male, Finland, April.

David Pattyn / Gadwall (Anas strepera) female on the water, Den Oever, The Netherlands, July.

David Pattyn / Gadwall (Anas strepera) female on water, Den Oever, The Netherlands, July

Nick Upton / Wide angle view of a mixed flock of Coots (Fulica atra), Wigeon (Anas penelope), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) swimming, dabbling and diving, Rutland Water, Rutland, Englan...

Nick Upton / Slow motion clip of a mixed flock of Coots (Fulica atra), Wigeon (Anas penelope), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) swimming, dabbling and diving, Rutland Water, Rutland, Engla...

Nick Upton / Panning shot of a mixed flock of Coots (Fulica atra), Wigeon (Anas penelope), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) swimming, dabbling and diving, Rutland Water, Rutland, England,...

Nick Upton / Mixed flock of Coots (Fulica atra), Wigeon (Anas penelope), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) swimming, dabbling and diving, Rutland Water, Rutland, England, UK, November.

Nick Upton / Mixed flock of Wigeon (Anas penelope), Coots (Fulica atra), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) dabbling, diving and competing aggressively by pecking one another, Rutland Water,...

Nick Upton / Mixed flock of Wigeon (Anas penelope), Coots (Fulica atra), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera) dabbling, diving and competing aggressively by pecking one another, Rutland Water,...

Nick Upton / Two Gadwall (Anas strepera) drakes and a duck upending and dabbling, Rutland, England, UK, November.

Nick Upton / Two Gadwall (Anas strepera) dabbling on the margins of a lake, Rutland Water, Rutland, England, UK, November.

Nick Upton / Two pairs of Gadwall (Anas strepera) upending and dabbling on a lake, Rutland, England, UK, November.

Nick Upton / Gadwall (Anas strepera) drake dabbling on the margins of a large lake, Rutland Water, Rutland, England, UK, November.

Nick Upton / Flock of Coots (Fulica atra) diving and dabbling alongside Wigeon (Anas penelope), Tufted duck (Aythya fuligula) and Gadwall (Anas strepera), Rutland Water, Rutland, England, UK, November.

Nick Upton / Slow motion clip of a flock of Coots (Fulica atra) swimming, diving and dabbling alonside Wigeon (Anas penelope), Tufted duck (Aythya fuligula), Gadwall (Anas strepera) and a Mute swan (Cygnus olor),...

Nick Upton / Black-tailed godwit (Limosa limosa) wading in a shallow lake and probing for invertebrates, with a female Gadwall (Anas strepera) swimming past, Gloucestershire, England, UK, March.

Nick Upton / Pair of Gadwall (Anas strepera) dabbling in a lake and calling as another duck approaches, Gloucestershire, England, UK, March.

Nick Upton / Avocet (Recurvirostra avosetta) foraging in a shallow lake, sweeping its bill through the water to filter feed, passing a pair of Gadwall (Anas strepera), and then preening and bathing, Gloucestershir...

Nick Upton / Five Gadwall (Anas strepera) drakes upending whilst feeding, Rutland Water, Rutland, England, UK, November.

Nick Upton / Group of four Gadwall (Anas strepera) drakes upending whilst feeding, Rutland Water, Rutland, England, UK, November.

Nick Upton / Gadwall (Anas strepera) drake upending whilst feeding, before leaving the frame, Rutland Water, Rutland, England, UK, November.

Nick Upton / Gadwall (Anas strepera) drake upending whilst feeding, Rutland Water, Rutland, England, UK, November.

Nick Upton / Gadwall (Anas strepera) drake resting on flooded marshland, RSPB Greylake reserve, Somerset Levels, UK, February.

Nick Upton / Gadwall (Anas strepera) drake calling as it swims on flooded marshland, RSPB Greylake reserve, Somerset Levels, UK, February.

Nick Upton / Gadwall (Anas strepera) drake walking on grassy margins of a lake, Gloucestershire, UK, April.

SCOTLAND: The Big Picture / Gadwall (Anas strepera) drake standing in wetland habitat, St John's Pool Bird Reserve, Thurso, Caithness, Scotland, UK, May.

SCOTLAND: The Big Picture / Gadwall (Anas strepera) drake standing in water, St John's Pool Bird Reserve, Thurso, Caithness, Scotland, UK, May.

Roger Powell / Gadwall pair (Anas strepera) swimming together. Druridge Pools Nature Reserve, Northumberland, England, UK. March.

Markus Varesvuo / Gadwall (Anas strepera) male on water, Hungary May

Markus Varesvuo / Gadwall (Anas strepera) male and female pair on water, Hungary May

Markus Varesvuo / Gadwall (Anas strepera) male head portrait, Hungary May

Bernard Castelein / Gadwall (Anas strepera) pair mating on water, Antwerp, Belgium May

Bernard Castelein / Gadwall (Anas strepera) four in flight, Antwerp, Belgium, April

Bernard Castelein / Gadwall (Anas strepera) in flight, Antwerp, Belgium, April

Bernard Castelein / Gadwall (Anas strepera) in flight, Antwerp, Belgium April

Jussi Murtosaari / Gadwall (Anas strepera), male with Mute swan (Cygnus olor), Korpoo, Uto, Finland, May.

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) pair, The Netherlands. April

David Pattyn / Gadwall (Anas strepera) female. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

David Pattyn / Gadwall (Anas strepera) male. The Netherlands. April

Bernard Castelein / Gadwall (Anas strepera) female in flight, Antwerpen, Belgium, April.

Bernard Castelein / Gadwall (Anas strepera) female with ducklings, Antwerpen, Belgium, June.

Alan Murphy / Gadwall (Anas strepera) male, Texas

Alan Murphy / Gadwall (Anas strepera) male, Texas

Loic Poidevin / Gadwail (Anas strepera) in water, Parc naturel regional de la Brenne / Brenne Regional Nature Park, France, May

Nick Upton / Female Gadwall (Anas strepera) flapping its wings in flooded marsh, Gloucestershire, UK, February.

Bernard Castelein / Gadwalls (Anas strepera) in flight, Antwerp, Belgium, April.

Bernard Castelein / Gadwall (Anas strepera) on water, flapping wings. Antwerp, Belgium, May.

Bernard Castelein / Gadwall (Anas strepera) male swimming, Antwerp, Belgium, May.

Bernard Castelein / Gadwall (Anas strepera) pair on water, Antwerp, Belgium, March.

Ernie Janes / Gadwalls (Anas strepera) in flight over Cley marshes, Norfolk, UK, June.

Ernie Janes / Gadwall (Anas strepera) landing at Cley Nature eserve, North Norfolk, UK, May.

Ernie Janes / Gadwalls (Anas strepera) in flight over Cley marshes, Norfolk, UK, June.

David Tipling / Gadwall (Anas strepera) group of males chasing female, Cley Marshes Reserve, Norfolk, England, UK. March

David Tipling / Gadwall (Anas strepera) male flapping wings, Cley Marshes Reserve, Norfolk, England, UK.

Markus Varesvuo / Female Gadwall (Anas strepera) on water, Iceland, June

Guy Edwardes / 2020VISION / Male Gadwall (Anas strepera) standing on a frozen lake, Catcott Lows, Somerset Levels, Somerset, England, UK, December.

Guy Edwardes / 2020VISION / Male Gadwall (Anas strepera) standing on a frozen lake, Catcott Lows, Somerset Levels, Somerset, England, UK, December.

Walter Soestbergen / Gadwall (Anas strepera) male, Utrecht, Netherlands

Ernie Janes / Gadwall (Anas strepera) and young in freshwater creek, Cley, Norfolk, England, UK, August.

Ernie Janes / Gadwall (Anas strepera) in flight over marshes, England, UK, July.

Jussi Murtosaari / Gadwall (Anas strepera) male, southern Finland, May.

Jussi Murtosaari / Gadwall (Anas strepera) adult male, southern Finland, May.

Fergus Gill / Gadwall (Anas strepera) male displaying on a loch. Glasgow, Scotland, December.

Nick Upton / Gadwall (Anas strepera) drake walking on muddy margins of a lake, Gloucestershire, UK, May.

Nick Upton / Gadwall (Anas strepera) drake courting a female, raising his head to quack, Gloucestershire, UK, April.

Nick Upton / Female Gadwall (Anas strepera) duck dabbling in shallow water around a lake edge, Gloucestershire, UK, May.

Nick Upton / Gadwall (Anas strepera) drake reflected in lake water as it swims, Gloucestershire, UK, May.

Bence Mate / Gadwall ducks mating {Anas strepera} on water, Pusztaszer, Hungary

Robin Chittenden / Gadwall (Anas strepera) pair (female to left) on water. Strumpshaw Fen RSPB, Norfolk, UK, November.

Richard Steel / 2020VISION / Male Gadwall (Anas strepera) swimming on lake, London, England, UK, October.

Markus Varesvuo / Gadwall (Anas strepera) Finland May

Markus Varesvuo / Gadwall (Anas strepera) female Finland May

Ernie Janes / Gadwall (Anas strepera) two drakes in flight, Norfolk, UK

Ernie Janes / Gadwall (Anas strepera) drake in flight, Norfolk, UK

Ernie Janes / Gadwall (Anas strepera) mating pair, Norfolk, UK

Ernie Janes / Gadwall (Anas strepera) drake landing on water, Norfolk, UK

Markus Varesvuo / Gadwall (Anas strepera) on water. Uto, Finland, May.

Terry Whittaker / 2020VISION / Gadwall (Anas strepera) female duck stretching wings on Rutland Water, Rutland, UK, April