The bank vole is a resilient rodent that serves as a vital ecological reservoir.

Nature · Published 20 October 2026 Swipe more like this →

In short: This small, chestnut-brown creature is more than just forest prey. Beyond its agility in climbing trees and navigating dense undergrowth, the bank vole acts as a critical reservoir for the Puumala virus. Understanding its biology has become essential for both ecological stability and advancements in biomedical research.

The bank vole (Clethrionomys glareolus) is a widespread rodent native to Europe and northwestern Asia, typically inhabiting deciduous and mixed woodlands, hedgerows, and parks. Measuring roughly 100 millimetres in length, it is distinguished from other voles by its chestnut-brown fur, prominent ears, and a tail that reaches about half its body length. Unlike many small mammals, it does not hibernate, remaining active throughout the year by storing food in underground chambers and maintaining nests made of moss and leaves.

Ecologically, the bank vole is a cornerstone species, providing a primary food source for predators like the red fox, tawny owl, and various weasels. However, its role is complex; it is also a natural reservoir for the Puumala hantavirus, which can cause haemorrhagic fever in humans. Interestingly, research into this relationship has yielded medical insights. Scientists have successfully used maternal antibodies to eradicate the virus from laboratory colonies, a process that provides a potential blueprint for managing similar pathogens in other rodent populations.

Beyond virology, the bank vole is a subject of significant interest in genetics and disease modeling. Because it is susceptible to prions from various species, it is frequently used to study prion diseases. Researchers have identified specific amino acid residues in the bank vole's PrPC protein that appear to facilitate both spontaneous and template-driven misfolding. This unique biological susceptibility, combined with its ability to adapt to diverse environments—from alpine coniferous forests to isolated islands like Skomer, where it has evolved into a larger, distinct subspecies—makes the bank vole an invaluable model for understanding complex biological mechanisms.

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