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Hazel Dormouse

(Muscardinus avellanarius)

Hazel Dormice are hard to spot – not only do they only come out at night, but they are also only found in very few places in the UK. Hazel Dormice spend a lot of their time hibernating – and are known to snore!

Young Hazel Dormouse by Terry Whittaker/2020VISION
© Danny Green
Hazel Dormouse

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Membership builds our community and gives us a predictable income, which lets us plan and sustain longer projects that can have a greater impact. The more members we have, the more we can do to protect the Sussex countryside and coast.

Overview

Hazel Dormice spend most of their day asleep. At night they come alive, climbing high into the trees on the hunt for a tasty snack. Their favourite foods are hazelnuts, berries and insects.

Hazel Dormice build nests out of grass and leaves ready for the female to give birth to up to seven young. In autumn, dormice start looking for the perfect spot to hibernate for winter. They often choose to sleep in logs or leaves at the base of trees or just beneath the ground where they can avoid the winter cold.

Key Facts

  • The Hazel Dormouse has gingery-brown fur, large black eyes and a long, fluffy tail; it is much smaller than a squirrel.
  • Hazel Dormice, like many of our other small animals, hibernate through the winter months in order to survive. If food is scarce outside of hibernation season, they can save energy by dropping their body temperature and going into a state of ‘torpor’. In fact, Hazel Dormice can spend nearly three-quarters of the year ‘asleep’ in some form!
  • Length: 6-9cm. Tail: 5.7-6.8cm. Weight: 15-40g. Average lifespan: 5 years

Status

Protected in the UK under the Wildlife and Countryside Act, 1981. Priority Species under the UK Post-2010 Biodiversity Framework. Listed as a European Protected Species under Annex IV of the European Habitats Directive.

Seasonality

April to October

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