Sven Zacek / Pristine boreal forest in Kopu Nature Reserve Area, Hiiumaa island, Estonia, October 2013.

Dave Bevan / Bank vole (Myodes glareolus) feeding from a bird feeder anlongside a Coal tit (Periparus ater) and Blue tit (Cyanistes caeruleus), Carmarthenshire, Wales, UK, September.

Andrew Parkinson / Water vole (Arvicola terrestris) feeding on a grass bank. Derbyshire, UK, April (non-ex)

Andy Sands / Water vole (Arvicola terrestris) Standing on back legs on riverbank, West Sussex, England, UK.

Andy Sands / Bank vole (Clethrionomys glareolus) holding Sweet Chestnut seed in Autumn, Captive, UK.

Andy Sands / Bank vole (Clethrionomys glareolus) sitting on apple among wind fallen fruit, Captive, UK.

Andy Sands / Bank vole (Clethrionomys glareolus) standing up to feed on Black Bryony berries, Captive, UK.

Stephen Dalton / Bank vole (Clethrionomys glareolus) feeding, England, UK

Dave Bevan / Bank vole (Clethrionomys glareolus) coming out of burrow under snow, Carmarthenshire, Wales, UK February

David Kjaer / Water Vole (Arvicola terrestris) emerging from burrow on muddy river bank, Wiltshire, England

David Kjaer / Water Vole (Arvicola terrestris) on muddy river bank near burrow, Wiltshire, England

David Kjaer / Water Vole (Arvicola terrestris) emerging from burrow on muddy river bank, Wiltshire, England

Dietmar Nill / Bank vole (Clethrionomys glareolus) across stream. Germany, Europe.