Oscar Dewhurst / Mandarin duck (Aix galericulata) drake swimming on pond, backlit by rising sun and bokeh effect, Richmond Park, London, UK. February.

David Pattyn / Juvenile Mute swan (Cygnus olor) in early morning light, Valkenhorst Nature Reserve, The Netherlands, Europe. August.

David Pattyn / Mute swan (Cygnus olor) in early morning light removing its own feathers, Valkenhorst Nature Reserve, The Netherlands, Europe. August.

Oscar Dewhurst / Shelduck (Tadorna tadorna) landing on water. Gloucestershire, England, UK. March

Oscar Dewhurst / Mute swan (Cygnus olor) swimming through ice. Richmond Park, London, England, UK. December

Oscar Dewhurst / Canada geese (Branta canadensis) in flight low over lake at sunrise in mist. London, UK. November

Pal Hermansen / Whooping swan (Cygnus cygnus) in flight, blurred image. Tysslingen, Orebro, Sweden. March.

Oscar Dewhurst / Mute swan (Cygnus olor) cygnet swimming. Richmond Park, London, UK. May

David Pattyn / Mute swan (Cygnus olor) in a threathening territorial pose and attacking a rival, Lake Geneva, near Geneva, Switzerland, March

John Cancalosi / Canada Goose (Branta canadensis) on nest with goslings, New York, USA.

Nick Upton / Greylag goose (Anser anser) landing with its wings and head raised to chase off another from its territory in a marshland pool, Gloucestershire, UK, January.

Nick Upton / Marsh harrier (Circus aeruginosus) female hunting among a panicked flock of Common teal (Anas crecca) in flight over marshland, RSPB Greylake Nature Reserve, Somerset, UK, December.

Tim Laman / Canada goose (Branta canadensis) with gosling, a few days old. Massachusetts, USA. April.

Tim Laman / Canada goose (Branta canadensis) with gosling, a few days old. Massachusetts, USA. April.

George Sanker / Wood duck (Aix sponsa) male in breeding plumage. Acadia National Park, Maine, USA. April.

Danny Green / Whooper Swans (Cygnus cygnus) in snow. Japan, February.

Oscar Dewhurst / Mute swan (Cygnus olor) pair at sunrise. London, UK. December.

Oscar Dewhurst / Mute swan (Cygnus olor) parents and cygnets on a misty lake at sunrise. London, UK. May

Oscar Dewhurst / Mute swan (Cygnus olor) parent and cygnets swimming. London, UK. May

Oscar Dewhurst / Mute swan (Cygnus olor) cygnets and parents swimming. London, UK. May

Andres M. Dominguez / Adult male King Eider (Somateria spectabilis) in flight. Batsfjord, Norway, March.

Andres M. Dominguez / Adult male King Eider (Somateria spectabilis).Batsfjord, Norway, March.

Andres M. Dominguez / Eider (Somateria mollissima) male animal, Batsfjord, Norway. March

Oscar Dewhurst / Mute swan (Cygnus olor), two cygnets sheltering under parent's wing. Richmond Park, London, England, UK. April.

Oscar Dewhurst / Mute swan (Cygnus olor) swimming with cygnets in misty lake in morning light. Richmond Park, London, England, UK. May.

Jack Dykinga / Bald eagle (Haliaeetus leucocephalus) perched as Snow geese (Chen caerulescens) fly by, Bosque del Apache National Wildlife Refuge, New Mexico, USA, January.

Jack Dykinga / Snow goose (Chen caerulescens) landing into a tight packed flock on lake, Bosque del Apache National Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / Snow goose (Chen caerulescens) landing into flock, Bosque del Apache National Wildlife Refuge, New Mexico, USA, January.

Jussi Murtosaari / Whooper swan (Cygnus cygnus), adult with young ones, Finland, August.

Jack Dykinga / Flocks of Mallard ducks (Anas platyrhynchos) taking off in tree-lined wetlands. Bosque del Apache National Wildlife Refuge, New Mexico, USA.

Andy Rouse / Mute swan (Cygnus olor) stretching wings on water. In morning light, Wales, UK. February.

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

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

Marie Read / Canada geese (Branta canadensis) two during territorial fight in early spring, Ithaca. New York, USA

Marie Read / Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October.

David Pattyn / Mute swan (cygnus olor) family, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, June

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

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

Ernie Janes / Brent geese (Branta bernicla) flying with moon, Titchwell, Norfolk, UK, December

Markus Varesvuo / White-fronted goose (Anser albifrons) and Taiga bean goose (Anser fabalis rossicus) flocks in flight and on water. Latvia. April.

David Tipling / Pink-footed geese (Anser brachyrhynchus) flying against strong northerly wind off Salthouse North Norfolk, wind turbines in sea in background, England, UK. November

Ernie Janes / RF - Mute swans (Cygnus olor) flock of non breeding adults, Fleet lagoon Dorset, England, UK, June. (This image may be licensed either as rights managed or royalty free.)

David Allemand / Two Snow geese (Anser caerulescens) during migration, with dark clouds against the sun, Quebec, Canada, October.

Konrad Wothe / Goosander (Mergus merganser) chick hunting mayfly, Upper Bavaria, Germany