Nick Upton / Greylag goose (Anser anser) stepping through ice whilst emerging from a partly frozen marshland pool, Gloucestershire, England, UK, January.

Nick Upton / Grey seal (Halichoerus grypus) lying on a beach and rolling over in the waves, Norfolk, England, UK, January.

Nick Upton / Lapwings (Vanellus vanellus) and Golden plover (Pluvialis apricaria) in flight and landing to join large flocks of Wigeon (Anas penelope) swimming on partially flooded pastureland, Gloucestershire, En...

Nick Upton / A group of Canada geese (Branta canadensis) swimming on flooded pasture past Pochard (Aythya ferina), resting Shelduck (Tadorna tadorna), Shoveler (Anas clypeata) and Lapwings (Vanellus vanellus), Glo...

Nick Upton / Canada geese (Branta canadensis) preening and bathing by somersaulting on the surface of a lake, slow-motion clip, Gloucestershire, England, UK, January.

Nick Upton / Bewick's swan (Cygnus columbianus bewickii) standing on flooded pastureland, surrounded by grazing Wigeon (Anas Penelope) and Lapwings (Vanellus vanellus), Gloucestershire, England, UK, February.

Andy Jackson / 2020VISION / Hen Arctic charr (Salvelinus alpinus) being striped of eggs by an Environment Agency Officer before being marked with dye, part of a breeding programme, River Lisa, Ennerdale, Lake District National P...

Staffan Widstrand / White-backed woodpecker (Dendrocopos leucotos), male on tree trunk in snow, Stora Tuvan Nature Reserve, Vasterbotten, Sweden

Staffan Widstrand / Grey-headed woodpecker male, (Picus canus) on tree trunk in snow, Stora Tuvan Nature Reserve, Vasterbotten, Sweden

Staffan Widstrand / White-backed woodpecker (Dendrocopos leucotos) male on tree trunk in snow, Stora Tuvan Nature Reserve, Vasterbotten, Sweden

Staffan Widstrand / White-backed woodpecker (Dendrocopos leucotos) female on tree trunk in snow, Stora Tuvan Nature Reserve, Vasterbotten, Sweden

Staffan Widstrand / White-backed woodpecker (Dendrocopos leucotos) female on tree trunk in snow, Stora Tuvan Nature Reserve, Vasterbotten, Sweden