Jack Dykinga / Sandhill cranes (Antigone canadensis) and Snow geese (Chen caerulescens) at sunrise, Bosque del Apache National Wildlife Refuge, New Mexico, USA, November.

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

Bence Mate / Graylag gosling (Anser anser) resting under parent's wing, Pusztaszer, Kiskunsagi National Park, Pusztaszer, Hungary.

Bence Mate / Graylag gosling (Anser anser) resting under parent's wing, Kiskunsagi National Park, Pusztaszer, Hungary.

Bernard Castelein / Canada goose (Branta canadensis) goose reflected in drain canal, in mist at dawn. Groot Schietveld, Wuustwezel, Belgium. May 2010.

Loic Poidevin / Egyptian Goose (Alopochen aegyptiaca) foraging in grass, Masai Mara, Kenya. March.

Dong Lei / Bar headed goose (Anser indicus) flock standing at water's edge. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Dong Lei / Bar headed goose (Anser indicus) flock standing at water's edge. Sanjiangyuan National Nature Reserve, Qinghai Province, Qinghai-Tibet Plateau. August.

Tony Heald / Canada goose (Branta canadensis), two males fighting over territory, UK. April.

Ingo Arndt / Upland goose (Chloephaga picta) pair. Torres del Paine National Park, Patagonia, Chile. August.

Nick Upton / Greylag goose (Anser anser) pair swimming with four goslings on a lake, Gloucestershire, UK, April.

Nick Upton / Greylag goose (Anser anser) emerging from a lake with its brood of six goslings following, Gloucestershire, UK, April.

John Shaw / Canada Goose (Branta canadensis) in flight. Gilbert Water Ranch, Arizona, USA. January.

Robin Chittenden / Greylag goose (Anser anser), two on water, exhibiting aggression. Norfolk, England, UK. April.

Ernie Janes / Brent geese (Branta bernicla) in swimming in creek, Norfolk, England, UK, March.

Loic Poidevin / Egyptian goose (Alopochen aegyptiaca) swimming through water lettuce with goslings, Masai Mara River, Kenya, March

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) with wings spread at water, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) bathing, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) drinking at waterhole, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) preening, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) walking towards camera, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus) rear view, Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / Egyptian goose (Alopochen aegyptiacus), Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Heather Angel / Bar headed geese (Anser indicus), four in flight, one calling. Coming in to land at breeding site, Qinghai Lake, Qinghai Province, China.

David Woodfall / Barnacle Geese (Branta leucopsis) on machair. North Uist, Outer Hebrides, Scotland, UK, March.

David Woodfall / Barnacle Geese (Branta leucopsis) and sheep on machair. Berneray, Outer Hebrides, Scotland, UK, March.

David Woodfall / Barnacle Geese (Branta leucopsis) and sheep on machair. Berneray, Scotland, Outer Hebrides, UK, March.

David Woodfall / Greylag goose (Anser anser) grazing amongst cattle on machair, Berneray, Outer Hebrides, Scotland, UK, March.

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

John Shaw / Snow goose (Chen caerulescens) about to land. Bosque del Apache National Wildlife Refuge, New Mexico. USA, January.

Andy Rouse / Canada Goose (Branta canadensis) pair with young. UK. May.

Rod Williams / Emperor goose (Chen canagica) portrait, captive. Occurs in Alaska and Siberia.

SCOTLAND: The Big Picture / Barnacle goose (Anser brachyrhynchus) flock in flight with Paps of Jura in background, Islay, Scotland, UK, March.

SCOTLAND: The Big Picture / Barnacle geese, (Branta leucopsis) , flock in flght over farmland, Islay, Scotland, UK., March

SCOTLAND: The Big Picture / Barnacle geese, (Branta leucopsis) , flock grazing on croft land, Islay, Scotland, UK., March

SCOTLAND: The Big Picture / White-fronted goose (Anser albifrons) small group silhouetted at sunset, Islay, Scotland, UK., March

SCOTLAND: The Big Picture / White-fronted goose (Anser albifrons) small group silhouetted at sunset, Islay, Scotland, UK., March

SCOTLAND: The Big Picture / Greylag Geese (Anser anser) two birds in flight at dawn, Scotland, UK.November

SCOTLAND: The Big Picture / Greylag Geese (Anser anser) two silhouetted at dawn against moon, Scotland, UK.November

Bernard Castelein / Orinoco goose (Oressochen jubatus), bathing, Pampas del Yacuma Protected Area, Bolivia

Bernard Castelein / Orinoco goose (Oressochen jubatus), Pampas del Yacuma Protected Area, Bolivia

Loic Poidevin / Brant goose (Branta bernicla) Vendee, France, January.

Nick Upton / Bewick's swan (Cygnus columbiana bewickii) sliding on ice as it lands on a frozen marshland pool with other swans and Canada geese (Branta canadensis) in the background, Gloucestershire, UK, Febru...

Nick Upton / Canada goose (Branta canadensis) sliding on ice as it lands on a frozen marshland pool, Gloucestershire, UK, February.

Nick Upton / Canada goose (Branta canadensis) sliding on ice past others watching it as it lands on a frozen marshland pool, Gloucestershire, UK, February.

Suzi Eszterhas / Canada Goose (Branta canadensis) Young gosling (less than one-week-old) International Bird Rescue, Fairfield, California. Captive - rescued and in rehabilitation

David Pattyn / Greylag goose (Anser anser) on a misty morning, Valkenhorst Nature Reserve, Valkenswaard, The Netherlands, March

Ernie Janes / Mute swan (Cygnus olor) attacking Canada goose (Branta canadensis) watched by Coots (Fulica atra) Fleet lagoon, Dorset, England, UK, June.

Markus Varesvuo / White-fronted goose (Anser albifrons) in flight, viewed from below. Latvia. April.

George Sanker / Canada goose ( Branta canadensis), two on Yellowstone River in morning mist. Yellowstone National Park, Wyoming, USA. September.

Nick Upton / Migrating flock of Greater white-fronted geese (Anser albifrons) flying overhead, Lake Peipsi, Estonia, April.

David Tipling / Pink-footed goose (Anser brachyrhynchus) with injured wing after being shot. Holkham, Norfolk, England, UK. October.

Ann & Steve Toon / Barnacle geese (Branta leucopsis) in flight, Caerlaverock WWT reserve, Dumfries & Galloway, Scotland, October

Nick Upton / Greylag goose (Anser anser) flapping its wings in blowing snow, Gloucestershire, UK, February.

Nick Upton / Barnacle geese (Branta leucopsis) taking off as a hunting Red fox (Vulpes vulpes) stands on the saltmarsh they were resting on, Severn estuary, Gloucestershire, UK, February.

Nick Upton / Barnacle geese (Branta leucopsis) taking off as a hunting Red fox (Vulpes vulpes) walks across the saltmarsh they were resting on, Severn estuary, Gloucestershire, UK, February.

Nick Upton / Canada goose (Branta canadensis) in flight overhead, Gloucestershire, UK, February.

Sandesh Kadur / Egyptian goose (Alopochen aegyptiaca) at edge of water. Lake Manyara National Park, Tanzania.

David Tipling / Greater white-fronted goose (Anser albifrons) in snow, Salthouse North Norfolk, England, UK. February

David Tipling / Greater white-fronted goose (Anser albifrons) in snow, Salthouse North Norfolk, England, UK. February

David Tipling / Pink-footed geese (Anser brachyrhynchus) feeding in harvested sugar beet field in torrential rain and 50 mph winds, Salthouse North Norfolk, England, UK. November

David Tipling / Pink-footed geese (Anser brachyrhynchus) feeding in harvested sugar beet field, Salthouse North Norfolk, England, UK. November

David Tipling / Greylag geese (Anser anser) mating, Cley, Norfolk, England, UK. April.

Bernard Castelein / Greylag Goose (Anser anser) pair mating; Antwerpen, Belgium. April

Konrad Wothe / Beach at sunset and Canada geese (Branta canadensis), Spiekeroog Island, East Frisian Islands, Wittbulten National Park. Wadden Sea UNESCO World Heritage Site, Germany, June.

Mike Read / Ruddy-headed goose (Chloephaga rubidiceps) two goslings amongst wild flowers on a sandy beach, Sealion Island, Falkland Islands, December.

Bernard Castelein / Greylag geese (Anser anser) fighting, Antwerpen, Belgium, March.

Bernard Castelein / Greylag goose (Anser anser) raising wings, Antwerpen, Belgium, March.

Bernard Castelein / Greylag Goose (Anser anser) preening wings Antwerpen, Belgium, March.

Bernard Castelein / Greylag Goose (Anser anser) taking off near reed bed, Antwerpen, Belgium, February.

Bernard Castelein / Greylag Goose (Anser anser) taking off from water, Antwerpen, Belgium, February.

Bernard Castelein / Greylag Goose (Anser anser) Antwerpen, Belgium, February.

Bernard Castelein / Andean Goose(Chloephaga melanoptera) calling, Quetena, Altiplano, Bolivia

Mike Read / Upland goose (Chloephaga picta leucoptera) flock at edge of the sea Pebble Island Falkland Islands British Overseas Territory December 2016

Yashpal Rathore / Bar-headed geese (Anser indicus) winter migratory birds, swimming, Keoladeo / Bharatpur National Park UNESCO Natural World Heritage Site, India

Yashpal Rathore / Bar-headed Geese (Anser indicus) winter migratory birds, swimming, Keoladeo / Bharatpur National Park UNESCO World Heritage Site, India

Yashpal Rathore / Flock of Bar-headed Geese (Anser indicus) winter migratory birds, returning to park at dusk after feeding on nearby agriculture fields. Keoladeo / Bharatpur National Park UNESCO Natural World Heritag...

Jen Guyton / Egyptian geese (Alopochen aegyptiacus) at sunset, Sungwe Channel, Gorongosa National Park, Mozambique.

Jen Guyton / Sunset over the Sungwe Channel with Egyptian geese (Alopochen aegyptiacus) stand in silhouette, Gorongosa National Park, Mozambique.

Bernard Castelein / Andean goose (Chloephaga melanoptera) flying across lagoon, Salar de Uyuni, altiplano September

Bernard Castelein / Andean goose (Chloephaga melanoptera) and Puna ibis (Plegadis ridgwayi) standing in lagoon, Salar de Uyuni, altiplano, Bolivia, September

David Tipling / Pink-footed geese (Anser brachyrhynchus) flock flying over harvested beet field, North Norfolk, UK December

David Tipling / Brent geese (Branta bernicla) flock feeding on beach, Wells, North Norfolk, October

Bernard Castelein / Canada goose (Branta canadensis) flapping wings on water surface, Antwerp, Belgium May

Bernard Castelein / Canada goose (Branta canadensis) female swimming with goslings, Antwerp, Belgium May

Bernard Castelein / Greylag goose (Anser anser) landing on ice, Antwerp, Belgium February

Bernard Castelein / Barnacle geese (Branta leucopsis) flock in flight, Zeeland, the Netherlands, March

Bernard Castelein / Barnacle geese (Branta leucopsis) flock in flight, Zeeland, the Netherlands, March

Bernard Castelein / Barnacle geese (Branta leucopsis) flock landing on water, Zeeland, the Netherlands, March

Bernard Castelein / Barnacle geese (Branta leucopsis) in flight, Zeeland, the Netherlands December

Bernard Castelein / Barnacle geese (Branta leucopsis) two resting on grass, Zeeland, the Netherlands December

Bernard Castelein / Brent goose (Branta bernicla) resting on grass, Zeeland, the Netherlands December

Mike Read / Upland goose (Chloephaga picta leucoptera) pair with goslings, Bleaker Island, Falkland Islands. November.