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Dormice

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Quick Facts

Scientific name:  Muscardinus avellanarius

Size:  Approximately 70mm long, and the thick furry tail is about the same length as the body.  During the summer, adults weigh between 17 and 20 grams (about the same weight as two £1 coins).  Before hibernation in autumn they almost double their weight

Distribution:  In England they're found mainly in the south from Cornwall to Kent, and northwards to Herefordshire and Northamptonshire.  They can be found throughout most of Wales, but not in ScotlandIn England they're found mainly in the south from Cornwall to Kent, and northwards to Herefordshire and Northamptonshire.  They can be found throughout most of Wales, but not in Scotland

Months seen:  Dormice are active at night between April and October.  In autumn, after the first frosts, they go into hibernation until spring

Life Span:  Up to five years (longer than other small rodents).

Habitat:  Dormice live in broad-leaved deciduous woodland and thick hedgerows.  Dormice need a habitat containing a variety of trees and shrubs to ensure a continuous supply of food.  Hazel, honeysuckle, bramble and oak provide most of their food.

Food:  Nuts, fruit, flowers, pollen and insects

Special features:  Dormice can be easily distinguished from other mice by their hairy tail.  The fur is an orange-brown colour, and they have long whiskers.

One of the favourite foods of the dormouse is hazelnuts, which they eat while they're still green and on the tree.  If you find a hazelnut shell with a perfectly round, smooth edged hole in the side, it's quite possible you're close to a dormouse nest.

Dormice usually have one, or sometimes two litters a year.  There can be three or four young which are normally born in early summer.  Those born in late summer rarely survive, as they don't have sufficient time to build up enough fat reserves for winter hibernation.

An old English name for the dormouse is 'sleeper', in fact the word 'dormouse' literally means sleeping mouse.

During hibernation they allow their body temperature to drop to that of their surroundings.  Their heart and breathing rate are often reduced by 90% or more.  If the air temperature drops below zero they "switch on" just enough body systems to keep their blood from freezing.


Note: Dormice are a protected species and you need a licence to handle them.


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