Nick Upton / Harvest mouse (Micromys minutus) cleaning its nose on Common hogweed (Heracleum sphondylium) flowerhead after release, Moulton, Northampton, UK, June.

Nick Upton / Jackdaw (Corvus monedula) hovering above a nest box it wants to nest in which a Grey squirrel (Sciurus carolinensis) and its mate have occupied, with the squirrel threatening the bird, Wiltshire, UK,...

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through snowy forest, Hokkaido, Japan.

Stephen Dalton / Brown rat (Rattus norvegicus) leaping from dustbin, Sussex, England.

Pal Hermansen / Beaver (Castor fiber) portrait. Trondelag, Norway. May.

Jen Guyton / A Eurasian beaver (Castor fiber) chews on a stem just outside of its lodge in a pond in the Elbe River Bioshere Reserve, northern Germany.

Pal Hermansen / Red squirrel (Sciurus vulgaris) in tree with conifer cone in mouth. Akershus, Norway. April.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) male sitting in tree, portrait. Hokkaido, Japan. March

Oscar Dewhurst / Grey squirrel (Sciurus carolinensis) stood upright on short grass. London, England, UK. March.

George Sanker / American red squirrel (Tamiasciurus hudsonicus) on tree trunk drinking in a beaver pond early in the morning. Acadia National Park, Maine, USA. May.

Claudio Contreras / Desmarest's hutia (Capromys pilorides doceleguas), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Klein & Hubert / European ground squirrel / Souslik (Spermophius citellus) standing in a carpet of flowers of Stork's bill (Erodium cicutarium) and holding in his paws a Poppy (Papaver rhoeas) flower before eating it,...

Klein & Hubert / Fat / Edible dormouse (Glis glis) on branch of flowering apple tree in spring, France. Controlled conditions

Klein & Hubert / Long eared jerboa (Euchoreutes naso) digging a burrow at night, Gobi desert at dawn. Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso), Gobi desert, portrait, Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso), Gobi desert, portrait, Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso) digging a burrow with teeth, Gobi desert, Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso) jumping, Gobi desert at dusk, Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso) jumping, Gobi desert, Mongolia

Klein & Hubert / Long eared jerboa (Euchoreutes naso) jumping, Gobi desert at dusk, Mongolia

Klein & Hubert / Long-eared jerboa (Euchoreutes naso) jumping, Gobi desert at dusk, Mongolia

Klein & Hubert / Harvest mouse (Micromys minutus) in cornfield with Poppies (Papaver rhoeas) in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) in cornfield with Poppies (Papaver rhoeas) in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) climbing between grass stems in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) climbing between grass stems in summer, France, Controlled conditions.

Klein & Hubert / Long-eared jerboa (Euchoreutes naso) at sunrise. Gobi Desert, Mongolia.

Oriol Alamany / Ethiopian Wolf (Canis simensis) catching a big-headed African mole-rat (Tachyoryctes macrocephalus) in the Sanetti Plateau, Bale Mountains National Park, Oromia, Ethiopia.

Neil Anderson / Red squirrel (Sciurus vulgaris), two curled up asleep in drey inside nest box. Nest of lichen and Pine needles. Highlands, Scotland, UK. Medium repro only.

Matthew Maran / Red fox (Vulpes vulpes) carrying a large dead Brown rat (Rattus norvegicus) in an urban garden, North London, UK. August.

Matthew Maran / Red fox (Vulpes vulpes) cub defending its kill,a large Brown rat (Rattus norvegicus) from another cub, North London, UK. August. Highly commended in the Behaviour : Mammals Category of the Wildlife Ph...

Ann & Steve Toon / Photographer Ann Toon photographing Cape ground squirrels (Xerus inauris) Kgalagadi Transfrontier Park, South Africa, January 2016. Model released.

David Woodfall / European beaver (Castor fiber) rear view in wetlands, in captive breeding programme .Bevis Trust, Carmarthenshire, Wales, UK, May.

David Woodfall / European Beaver (Castor fiber) amongst Pondweed (Potomogeton natans) in freshwater lake Bevis Trust, Carmarthenshire, Wales, UK, June.

Nick Hawkins / Underneath view of a North American beaver (Castor canadensis) swimming under the ice of a frozen river. Quebec, Canada. October.

SCOTLAND: The Big Picture / RF - Red Squirrel (Sciurus vulgaris), at woodland pond , Scotland, UK.April (This image may be licensed either as rights managed or royalty free.)

SCOTLAND: The Big Picture / Red squirrel, (Sciurus vulgaris), silhouetted on stump at dawn, Scotland, UK.March

SCOTLAND: The Big Picture / Red squirrel, (Sciurus vulgaris), two backlit on pine branch, Cairngorms National Park, Scotland, UK.May

SCOTLAND: The Big Picture / Red squirrel, (Sciurus vulgaris), three animals backlit on pine branch, Cairngorms National Park, Scotland, UK.May

SCOTLAND: The Big Picture / Red Squirrel (Sciurus vulgaris), at woodland pool, Cairngorms National Park, Scotland, UK.November

David Pattyn / Alpine marmot (Marmota marmota) carrying grass and other nesting material across snow to its nest while another one is on the lookout, Gran Paradiso National Park, Aosta Valley, Italy, April

Klein & Hubert / European Hamster (Cricetus cricetus) standing next to burrow. Alsace, France. September.