Bank Vole

The Bank Vole is a small, reddish-brown rodent found throughout much of Europe, commonly inhabiting woodlands, hedgerows, and grassy banks. It is one of the most abundant small mammals in its range and plays a key ecological role as prey and seed disperser. Notable for its short tail and rounded body, it is often confused with other vole species but distinguished by its chestnut coloring and blunter snout.

Widespread across Europe, from the UK and Ireland through France, Scandinavia, Central Europe, into Russia and parts of Asia Minor

Found across most of continental Europe from the Atlantic coast to the Ural Mountains, including the British Isles, Scandinavia, and parts of Russia and Asia Minor; absent from Iceland, most Mediterranean islands, and northern Scandinavia.

Altitude and depth

Typically found from sea level up to 2000m in mountainous regions such as the Alps, though most common at lower elevations.

Seasonal movements

No true hibernation; activity continues year-round but is reduced in winter with less breeding activity from October to March in temperate zones.

Prefers deciduous and mixed woodlands with dense understory, hedgerows, scrubland, and grassy banks near water; also found in gardens and agricultural margins with sufficient cover.

Adaptations to its environment

Possesses strong digging claws for burrowing, a flexible diet allowing survival on limited food, and high reproductive rate to offset high predation pressure and short lifespan.

Listed as Least Concern by IUCN due to widespread distribution, large population size, and tolerance of varied habitats including disturbed and agricultural landscapes.

Estimated population

Population numbers are very large and stable, likely in the tens of millions across Europe; considered one of the most common small mammals in its range.

Habitat fragmentation from agricultural intensification, loss of hedgerows and woodland edges, and pesticide use affecting food availability and health.

Diseases and parasites

Known carrier of hantavirus and can host various ectoparasites including fleas, ticks, and mites; also susceptible to endoparasitic worms.

No specific conservation programs targeted at this species due to its stable status; benefits indirectly from woodland and hedgerow conservation initiatives across Europe.

Recommended actions

Maintain hedgerow networks and woodland edge habitats in agricultural landscapes; monitor population trends as an indicator species for ecosystem health.

Chestnut-brown to reddish fur on the back with greyish-white underparts, a blunt rounded snout, small eyes and ears, and a relatively short tail compared to mice.

Size

Body length typically 8-12 cm, with a tail of 3-7 cm, making it noticeably shorter-tailed than many other vole species.

Weight

Adults typically weigh between 14-40 grams, with males slightly larger than females on average.

Distinctive features

Distinguished from field voles by its more reddish coloration and longer tail; differs from mice by its rounder body shape and shorter tail relative to body length.

Differences between males and females

Minimal sexual dimorphism; males are slightly larger and heavier than females but coloration is similar between sexes.

Generally solitary or living in loose social groups; territorial especially among breeding females, though home ranges may overlap seasonally.

When it is active

Primarily active during dawn and dusk (crepuscular) but can show activity throughout the day and night, especially in areas with low predation pressure.

Diet

Omnivorous diet consisting mainly of seeds, fruits, fungi, roots, and green vegetation, supplemented occasionally with invertebrates like insects and larvae.

How it feeds and hunts

Forages on the ground and occasionally climbs low vegetation to access seeds and berries; uses caching behavior to store food for leaner periods.

Communication

Communicates through scent marking via glandular secretions, high-frequency vocalizations for alarm and mating, and tactile interactions during social encounters.

Interactions with other species

Important prey species for owls, foxes, weasels, and other predators; competes with wood mice and other small rodents for food and habitat resources.

Role in its ecosystem

Plays a significant role in seed dispersal and as a primary prey species supporting populations of many predators; also affects vegetation dynamics through seed predation and foraging.

Breeding season runs from April to October with gestation lasting about 18-20 days; females can produce multiple litters per year of 3-6 young each.

Raising the young

Females provide sole care for offspring, nursing them in nest burrows for about 18 days until weaning; young become independent shortly after weaning and reach sexual maturity within weeks.

Maturity and lifespan

Reaches sexual maturity at around 6-8 weeks of age; lifespan in the wild is typically less than 1.5 years due to high predation, though captive individuals can live up to 2-3 years.

Classification

Class Mammalia > Order Rodentia > Family Cricetidae > Genus Myodes (formerly Clethrionomys) > Species glareolus

Subspecies

Several subspecies recognized including M. g. glareolus (mainland Europe), M. g. skomerensis (Skomer Island, Wales), and M. g. erica (Isle of Raasay, Scotland); island populations often show distinct size and coloration.

Scientific synonyms

Clethrionomys glareolus (older generic name still widely used); Myodes glareolus (current accepted name in many taxonomies).

Recent studies

Recent research has focused on the species' role as a hantavirus reservoir and studies examining population cycles in relation to seed mast years in European forests.

Genome and DNA

Diploid chromosome number is 2n=56; has been used in various genetic studies examining rodent population genetics and hantavirus transmission dynamics.

Compared with similar species

Similar in size to the field vole (Microtus agrestis) but distinguished by warmer reddish-brown coloring and a proportionally longer tail; smaller and more colorful than water voles.

Bank voles can climb surprisingly well for a ground-dwelling rodent, sometimes venturing into low shrubs for food. Their populations can fluctuate dramatically based on beech and oak mast years, leading to boom-bust cycles that ripple through predator populations.

Where and how to see it

Best observed at dawn or dusk in woodland edges, hedgerows, or areas with dense ground cover; look for small burrow entrances and listen for rustling in leaf litter during quiet walks.

Risks to humans

Can carry hantavirus which may cause illness in humans through contact with urine or droppings, though direct transmission risk is low with normal outdoor activity.

Human uses

Not commercially utilized by humans, though it serves as an important research subject in ecological, genetic, and disease transmission studies.