Laurie Campbell / Pale-bellied brent geese (Branta bernicla hrota) over wintering, Lindisfarne NNR, Northumberland, England, December.

Laurie Campbell / Pale-bellied Brent geese (Branta bernicla hrota) over wintering, Lindisfarne NNR, Northumberland, England, December.

Laurie Campbell / Pale-bellied Brent geese (Branta bernicla hrota) over wintering, Lindisfarne NNR, Northumberland, England, February.

Markus Varesvuo / Pale bellied brent goose (Branta bernicla hrota) Finland, November

Markus Varesvuo / Pale bellied brent goose (Branta bernicla hrota) with Barnacle goose in background, Finland, November

Laurie Campbell / Pale-bellied brent geese (Branta bernicla hrota) flock over wintering, some flying, Lindisfarne National Nature Reserve, Northumberland, England, February

Gerrit Vyn / Light bellied / Atlantic Brant Goose (Branta bernicla hrota) foraging on intertidal rocks at low tide. Ocean County, New Jersey, USA, January.

Gerrit Vyn / Light bellied / Atlantic Brant Goose (Branta bernicla hrota) in flight low over water, Ocean County, New Jersey, USA, January.

Roger Powell / Small flock of light-bellied Brent Geese (Branta bernicla hrota) flying to their roosting ground as high tide approaches, Holy Island, Northumberland, U.K.

Laurie Campbell / Pale-bellied Brent Geese (Branta bernicla hrota) flock flying low over the water, Lindisfarne NNR, Northumberland, England, February

Laurie Campbell / Pale-bellied Brent Geese (Branta bernicla hrota) flock flying over beach, over wintering, Lindisfarne NNR, Northumberland, England, February

Mike Potts / Pale Bellied Brent Geese (Branta bernicla hrota) flock in flight with the snow covered mountains of Snowdonia in the background, Menai Straits, Gwynedd, North Wales, UK. March 2009