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  3. Fat Dormouse

One of the 2 dormouses on WAnimals

Fat Dormouse (Glis glis)

Mammals · Rodentia · Gliridae

Fat Dormouse

Glis glis

Least Concern

The species is abundant and widely distributed; it faces no significant short-term risk.

Spotted something wrong?

It was eaten as a delicacy by the ancient Romans, who fattened them in special enclosures called gliraria. It can skip breeding altogether in a poor seed year, which contributes to its unusual longevity.

Weight

100 g – 150 g

Size

14 cm – 19 cm

Life expectancy

9 years

Diet

Omnivore

Combines animal and plant food depending on availability.

Activity

Nocturnal

Active mainly at night.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

Sighting difficulty

Easy

Temperate forest
45countries169parks1same family

AI-generated images: illustrations, not photographs.

Fun facts

  • fisiologíaIn some populations it can hibernate for as much as 11 months a year, one of the longest hibernations known in any mammal.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (mammal)
Habitat and environment
Deciduous woodland, orchards and gardens of central and southern Europe and parts of Asia Minor
Birth weight
1.5 grams
Size at birth
Blind and hairless at birth
Sexual maturity
~1 year (some sources give 6-9 weeks in good conditions, coming out of hibernation in a good harvest year)
Gestation / incubation
20-32 days
Litter / clutch size
1 to 12 young per litter (most commonly 4-6)
Life expectancy in captivity
Documented record of 8.7 years in captivity

Sources consulted: AnAge; EBSCO Research Starters; Līgatnes dabas takas; Lirons.org; Animalia.bio; Animal Diversity Web; PMC

Where to find it

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Where to see it

Parks and dive sites where this species has been documented — showing 10 of 169.

Related species

Other species in the catalogue with the most in common with Fat Dormouse — same habitat, park, country, tags or family.

Same taxonomic family
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Keep exploring

Based on what we already know about fat dormouse.

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See full glossary
This page in other languages: Español · Deutsch · Français · Português · Italiano

The pins mark the parks where its presence is documented.

See its range on the interactive map→
Doñana National ParkSpain
Gran ParadisoItaly
VanoiseFrance
Hohe TauernAustria
BerchtesgadenGermany
Stelvio (Stilfserjoch)Italy
EcrinsFrance
MercantourFrance
TriglavSlovenia
Picos de EuropaSpain
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CountriesSpain
ParksDoñana National ParkSpain
TagsOmnivore
Omnivore
Nocturnal
Solitary
Temperate forest
Mammal

Europe40

Asia5

Spain
Italy
France
Germany
Poland
Portugal
Albania
Andorra
Austria
Belarus
Belgium
Bosnia and Herzegovina
Bulgaria
Croatia
Czechia
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Ireland
Italy
Kosovo
Latvia
Liechtenstein
Lithuania
Luxembourg
Moldova
Montenegro
Netherlands
North Macedonia
Norway
Poland
Portugal
Romania
San Marino
Serbia
Slovakia
Slovenia
Spain
Sweden
Switzerland
Ukraine
United Kingdom
Armenia
Azerbaijan
Georgia
Russia
Türkiye