Small Mammals of Europe: Rodents, Shrews, Hedgehogs, and Dormice

Europe’s small mammals are not one taxonomic group. Under the scope used here, they comprise 157 living wild species in nine families: rodents in Rodentia, plus shrews and hedgehogs in Eulipotyphla. The count follows Mammal Diversity Database v2.5 continent coding. It covers living wild taxa coded for Europe, does not add every alien population whose native MDD continent lies elsewhere, and excludes beavers, porcupines, and marmots because their adult size places them outside the usual small-mammal survey category.[a]

A Mouse-shaped Body Does Not Mean Rodent

Mice, voles, rats, hamsters, squirrels, jerboas, birch mice, blind mole-rats, and dormice are rodents. They share the rodent tooth plan: one enlarged pair of upper and lower incisors, a gap behind the incisors, and no canine teeth. Shrews and hedgehogs belong to Eulipotyphla. Their teeth are adapted for grasping and processing invertebrates and other food rather than for the same gnawing action.

The 157-species European Working Checklist

The checklist uses accepted species names and Europe coding from Mammal Diversity Database v2.5, released on 28 July 2026. “Europe-coded” is deliberately broader than “present throughout Europe.” It includes narrow island endemics, Caucasus and steppe-edge taxa, and species associated with the European part of transcontinental states. It does not add every alien population recorded outside its native MDD continent. Country fields in a global database may not separate the European and Asian sectors of Russia, Türkiye, Kazakhstan, Georgia, or Azerbaijan.

Hedgehogs: Erinaceidae

Five hedgehog species fall within the European-coded scope. Their spines make the family easy to recognize, but white breast markings, ear length, colour, and geography must be considered together when separating species.

Shrews: Soricidae

The shrew list contains red-toothed Sorex, white-toothed Crocidura, semi-aquatic Neomys, and two more specialised lineages. External appearance alone is unreliable for several neighbouring species.

Dormice: Gliridae

Europe has five dormouse species in this scope. Dormice are rodents, not a separate order, and they differ sharply in habitat use: some are strongly arboreal, while the garden and mouse-tailed dormice often use rocks, scree, walls, or ground-level shelter.

Squirrels and Ground Squirrels: Sciuridae

This table retains tree squirrels, the flying squirrel, the Siberian chipmunk, and ground squirrels, while excluding marmots because they are normally treated as medium-sized burrowing mammals rather than small mammals.

Voles, Lemmings, and Hamsters: Cricetidae

Cricetidae is the largest family in the checklist. It includes short-tailed voles, lemmings, water voles, hamsters, snow voles, and burrowing forms whose ranges extend from Atlantic Europe to the Caucasus, tundra, and steppe.

Mice, Rats, Jirds, and Gerbils: Muridae

Muridae contains the familiar long-tailed field mice, the house mouse, rats, the harvest mouse, and dry-country jirds and gerbils. The presence of Mus musculus, Rattus norvegicus, or Rattus rattus often reflects close association with buildings, farms, ports, and stored food.

Jerboas: Dipodidae

Jerboas are concentrated toward the eastern European and transcontinental steppe edge. Long hind limbs and hopping locomotion separate them from mice and voles, although country-level database fields do not always show which side of a transcontinental state contains the European records.

Birch Mice: Sminthidae

Birch mice are small, long-tailed rodents with several narrow-range species in eastern Europe and the Caucasus. Modern taxonomy recognizes them as family Sminthidae rather than placing them among true mice.

Blind Mole-rats: Spalacidae

Blind mole-rats are subterranean rodents with reduced eyes, powerful incisors, and highly fragmented ranges. Recent species splitting has left many Nannospalax taxa without a completed IUCN assessment, so NE in this table often marks a taxonomic and assessment lag rather than proof of low risk.

Status codes: LC, Least Concern; NT, Near Threatened; VU, Vulnerable; EN, Endangered; CR, Critically Endangered; NE, Not Evaluated. The status column reproduces the IUCN category linked in MDD v2.5. National assessments may differ, and newly separated species may remain NE while their former broader taxon has an older assessment.

Where Europe’s Small Mammal Lineages Separate Ecologically

Woodland Canopies, Shrub Layers, and Leaf Litter

Apodemus field mice forage on the ground and climb readily, bank voles use dense ground cover, and dormice divide the woody habitat vertically. Hazel dormice depend heavily on connected shrubs and branch networks. Fat dormice make greater use of mature trees and cavities. Forest dormice occupy woodland and scrub across eastern and south-eastern Europe, while garden dormice can occur in forest, scree, vineyards, orchards, buildings, and urban edges. A woodland label therefore hides different needs for canopy connection, ground cover, rocks, cavities, and seasonal food.

Grassland, Farmland, and Steppe Burrow Systems

Common voles, field voles, hamsters, ground squirrels, blind mole-rats, mole voles, and birch mice occupy different parts of open landscapes. Some feed above ground and retreat into shallow tunnel systems. Blind mole-rats spend nearly their entire lives underground. Common hamsters build deeper burrows with nesting and food-storage chambers. Ground squirrels require open vegetation that allows visibility around burrow entrances. Intensive cultivation can favour a few short-lived generalists for a time while removing the field margins, crop diversity, undisturbed soil, and perennial cover needed by narrower-range species.

Riverbanks, Marshes, and Cold Streams

Water voles are rodents that feed mainly on plants and dig bank burrows or use dense wetland vegetation. Water shrews are predators. Neomys species take aquatic and riparian invertebrates and can swim underwater. Similar use of a river margin does not imply the same diet, field signs, or response to bank engineering. A large blunt-headed water vole, a rat, and a much smaller pointed-snouted water shrew require separate identification.

Tundra, Boreal Forest, and Alpine Rock

Lemmings and northern voles can remain active in the subnivean space beneath snow. Snow voles use rocky slopes and crevices. Alpine and taiga shrews persist through cold periods without the long hibernation used by dormice. At high elevation and latitude, snow depth, snow duration, ground insulation, moisture, and access to unfrozen prey can matter as much as air temperature.

Mediterranean Islands and Peninsulas

The Mediterranean portion of the checklist includes island and peninsula taxa such as the Sicilian, Cretan, and Iberian white-toothed shrews, the Sicilian pine vole, the Calabrian black squirrel, and several western Mediterranean mice. Island populations may be endemic species, old human introductions, or members of wider species with local genetic structure. A name on an island checklist should not be treated as proof of natural colonisation without archaeological, genetic, or museum evidence.

Separating Mice, Voles, Shrews, Dormice, and Other Lookalikes

Body size, tail ratio, and habitat narrow an identification; they do not always settle it. Many European small mammals belong to species complexes shaped by recent splitting, chromosome variation, or narrow contact zones.

Four Winter Strategies in the Same Landscape

Activity Beneath Snow

Voles and lemmings can feed and reproduce in insulated spaces between snow and ground. Snow cover reduces exposure to wind and some predators, but unstable freeze-thaw cycles can collapse tunnels, seal vegetation under ice, or remove insulation.

Food Storage and Periodic Torpor

Hamsters carry seeds and other food into burrows. Some mice also cache food. Stored food allows activity to continue when surface access is poor, and it can support periodic arousals during torpor or hibernation. The exact pattern differs among species and climates.

Extended Hibernation

Dormice accumulate fat and enter prolonged hibernation in protected sites. Hedgehogs also rely on fat reserves and insulated nests, although winter activity and hibernation timing vary with latitude, weather, sex, age, and body condition. A mild interval can produce temporary arousal without marking the end of the hibernation season.

Seasonal Shrinkage in the Common Shrew

Sorex araneus remains active through winter but undergoes Dehnel’s phenomenon: the skull, brain, and several organs shrink toward winter and regrow before the breeding season. A 2026 genomic and transcriptomic study linked this plasticity to pathways involved in neurogenesis and metabolic regulation, while also examining the species’ many chromosomal races.[b]

Threat Categories Reveal Uneven Risk

Most species in the MDD-linked status field are listed as Least Concern, but that pattern should not be mistaken for uniform security. Narrow-range blind mole-rats, birch mice, hamsters, ground squirrels, island shrews, dormice, and water voles carry many of the higher-risk categories. Fifteen species are Not Evaluated in the checked dataset; many are recently recognised or taxonomically rearranged.

The Common Hamster Is No Longer a Routine Farmland Rodent

The common hamster is listed as Critically Endangered. The IUCN assessment cites rapid decline in reproductive rate and projects severe future reduction across its range. Its survival depends on more than leaving isolated burrows untouched; crop sequence, harvest timing, cover, soil, food availability, and population connection all shape whether farmland remains usable.[c]

The Garden Dormouse Has Lost Much of Its Eastern Range

The garden dormouse moved from Near Threatened to Vulnerable in the 2024 IUCN assessment. A 2026 country-by-country review reports regional extinction in Estonia, Finland, Latvia, Lithuania, and Slovakia, and argues that the species may also be extinct in Belarus, Poland, and Ukraine. Western populations remain uneven: some urban or mountain populations persist, while other former localities have lost the species.[d]

A Familiar Hedgehog Can Still Move Toward Threat

The West European hedgehog moved from Least Concern to Near Threatened in 2024. IUCN reported shrinking numbers in more than half of the countries in its range and linked the decline to rural habitat degradation, roads, and urban development. Visibility in gardens does not measure the condition of populations across the wider landscape.[e]

Fragmentation Acts Differently on Each Group

A road can directly kill a hedgehog, divide ground-squirrel colonies, separate dormouse habitat, or block the moist bank vegetation used by water voles and shrews. In the EU-27 plus the United Kingdom, the European Environment Agency classifies 27% of land as highly fragmented, with average habitat patches below 0.02 km² in that category. The indicator measures structural fragmentation rather than the movement ability of each species, but it describes the barrier-rich setting in which many small populations persist.[f]

Pesticides create a second set of pathways. Direct exposure can affect mammals, while reduced insects and other invertebrates alter food supply for shrews, hedgehogs, and the more animal-feeding dormice. The EEA reports direct and indirect biodiversity effects across many non-target groups and notes broad reductions in European insect abundance, diversity, and biomass.[g]

Taxonomy Changes Fastest in the Hardest Animals to Identify

Blind mole-rats, pine voles, white-toothed shrews, water voles, birch mice, and field mice contain many recently separated or disputed lineages. Subterranean species may show little external variation while carrying deep chromosomal or genetic divisions. Conversely, visibly different populations may not meet the evidence threshold for species rank. This is why the checklist states a database version rather than presenting its 157 names as a permanent total.

The common shrew adds another layer: more than 75 chromosomal races have been described within Sorex araneus, yet those races are not automatically separate species. House mice also contain subspecies and hybrid zones, while several Microtus and Nannospalax identifications can require chromosomes or DNA. A photograph can support a record at genus or species-group level without proving the finest taxonomic identification.

Sources and Verification

1. [a] Mammal Diversity Database v2.5 — Used for accepted taxonomy, family placement, Europe coding, common names, and the MDD-linked IUCN categories in the 157-species working checklist.
2. [b] Genomic comparisons in the common shrew — Used for the 2026 findings on Dehnel’s phenomenon, seasonal brain plasticity, and chromosomal evolution in Sorex araneus.
3. [c] IUCN Red List assessment for Cricetus cricetus — Used for the Critically Endangered category and the assessment rationale concerning reproductive decline.
4. [d] The updated status of the threatened garden dormouse Eliomys quercinus — Used for the 2024 Vulnerable category and the 2026 country-level review of regional extinction, remaining populations, and unresolved causes of decline.
5. [e] IUCN Red List update for the West European hedgehog — Used for the 2024 move to Near Threatened and the reported pressures across the species’ range.
6. [f] EEA landscape fragmentation pressure in Europe — Used for the EU-27 plus United Kingdom fragmentation figure and its structural-connectivity limits.
7. [g] EEA briefing on pesticide effects on ecosystems — Used for direct and indirect effects on non-target organisms and evidence of reduced insect abundance, diversity, and biomass.