There are 15 species of Dormice but only 1 native to the UK (the edible Dormouse is an escapee found only around Kent). Dormice are part of the rodent family and have some of the characteristics of mice and squirrels yet are very different to both.

About dormice The common dormouse (Muscardinus avellanarius) is about 7.5cm (3 inches) long (head+body) plus another 6.5cm (2˝ inches) tail. It has orange/ yellow fur and a thick hairy tail. It weighs just 17g (˝oz), but may be twice as heavy before hibernation.

Creatures of the night Dormice are active at night, and sleep during the day. They rarely come to the ground. They climb in bushes and up to the highest branches of woodland trees.

Sleepers The name dormouse means sleeping mouse. Dormice spend half the year (October to May) in winter ‘sleep’, with low body temperature, slowed heart rate and breathing. Even in summer, part of the day may be spent in this kind of torpor. It is a way of reducing energy needs at times when food is not easy to come by.

Food Dormice eat pollen and nectar from flowers, insects and various fruits and nuts. Mostly these are high energy foods and differ from the seeds that most mice eat. Many things that dormice feed on are only available for a short period each year. They need a varied habitat so that a succession of foods can be used through their active season. Dormice are typically found in coppice woodland but also occur in deciduous wood, hedgerows, overgrown gardens and scrub.

Breeding  Most mice produce many large broods a year, but rarely live longer than a year. Dormice normally have a single small brood late in the summer, but can live five years or more.

Endangered  UK Dormice populations have suffered a 70% loss in the last 25 years. There are thought to only be 40,00 Dormice left in the UK, mostly in the South West of England and South Wales.

Dormice are a European protected species and are strictly protected by law and may not be intentionally killed, injured or disturbed in their nests, collected except under licence. Surveyors need training and handling licenses from DEFRA. 

Dormice are important in their own right but are also excellent indicators of wildlife hot-spots.

Dormice appear on the:
UK Biodiversity Priority List
B&NES Wildthings Partnership
South Gloucestershire's Biodiversity Action Plan

See image gallery www.dormice-on-your-doorstep.fotopic.net

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