Home // Campaigns // Dormice

Hazel dormice are hanging on mostly in the southern parts of England and Wales. But changes in woodland management, farming practices, loss of hedgerows and the fragmentation of woodland have all taken a heavy toll on their living space.

Dormice are a protected species in Britain and regarded by government, as well as us, as a priority for conservation action. Our dormouse campaign has three main elements:

1) Our nationwide monitoring scheme keeps a close eye on how dormice are doing. We have over 25 years of records painstakingly collected by hundreds of volunteer monitors that guide our actions to save dormice.

2) Our reintroduction programme has so far covered 12 counties at 19 sites. We regularly check how they are faring and how far they have spread and advise on dormouse-friendly land management.

3) It is so important to manage woodlands and hedgerows appropriately that we provide training and guides for woodland managers and others looking after the land.

Dormouse facts and reasons for their decline

Dormice need well managed woodlands connected by hedgerows so that they can spread. They thrived when hazel trees in woodlands were regularly cut back (coppiced) because this provided plenty of fruiting trees for food. Despite the revival of coppicing in some areas, many woodlands have changed too drastically to support dormice. The loss of hedgerows, and the lack of suitable management of many that remain, make matters worse by further limiting living space and isolating and reducing the dormice that remain.

To learn more about the life of a hazel dormouse see our fact file.

1) The National Dormouse Monitoring Programme (NDMP)

Weighing dormiceAlong with our partners at Royal Holloway University of London and Natural England, we collate and input the records from around 400 dormouse monitoring sites across the UK.

The NDMP has been running for the past 25 years and has several hundred trained monitors responsible for organising surveys using dormouse boxes throughout the year.

In 2014, we were sent 6,827 hazel dormice records from 387 sites. We are extremely grateful to all our dormouse monitors for their contribution to the programme. Read the latest findings and articles in our publications section.

Take part

Dormouse nest boxes

Dormouse nest boxes are central to our scheme. These wooden boxes are similar to bird boxes, but with the entrance hole at the back of the box facing the tree. As well as providing additional shelter for hazel dormice, and other visitors, they offer a way for us to detect these rare creatures. Large numbers of boxes can even boost populations.

Please note inspecting nest boxes requires a licence from Natural England or Natural Resources Wales in areas where dormice are already known to be present. If boxes or tubes are put out speculatively to detect presence, this in itself does not require a licence, but a licence is essential once the first dormouse has been found.

Dormouse monitoring conference

In 2013 we held our first Dormouse Monitoring conference for NDMP volunteers. You can view videos and other resources from the weekend here.

2) Reintroducing dormice

We are returning dormice to parts of Britain from which they are lost or where their numbers are worryingly low. In partnership with various other organisations, we have reintroduced captive bred animals into 19 woodlands over 12 counties since the first reintroduction to Cambridgeshire in 1993.

The success of the reintroductions are carefully monitored. At five of these sites dormice have successfully spread throughout the woodland where they were released. At seven sites they done even better, not only dispersing throughout the wood but starting to venture into the wider countryside which is great news.

Our latest reintroduction


On 10 June 2014 we reintroduced 21 breeding pairs of dormice into a woodland in Nottinghamshire close to another where we reintroduced some last year. The dormice were released into large cages secured to trees. A team of volunteers check the cages and provide food and water whilst the dormice get used to the sounds and smells of their new wild home. After two weeks small openings made in the cages allow the dormice go free and explore their new surroundings. The volunteers continue to visit the cages to provide food until such time that it is no longer required. Usually young dormice will be born at the new site early in the first season and will be able to put on enough fat so that they can survive their winter hibernation. Nest boxes put up in the wood give the dormice somewhere to nest over the summer and autumn and allow licenced volunteers to monitor the population into the future to see how well they do.

You can read about our successes in Natural England’s recent review of dormouse reintroductions.

3) Dormouse training and guides

You can learn more about managing land for dormice to give them the best chance of survival by attending one of our professional training courses.

You can also learn more in our online training area and in the leaflets below.

If you would simply like to get the chance to see these endangered mammals in their natural habitat, join us on a Wildlife Encounter.

Resources to help and survey dormice

Dormouse research

In addition to our own programmes we are constantly supporting vital dormouse research projects around the country. Read more about these projects and how you could apply for funding.

We have recently commissioned a review of 100 dormouse studies.

Butterfly Treefrog

Ways to help...

Get involved

Find out all the ways you can help stop more species being lost forever, from recording wildlife to fundraising for us.

Join in

£3 a month...

will help us to bring back dormice from the brink through our reintroductions.

Please donate to save dormice