Press release: 1,000th hazel dormouse reintroduced to the UK

Home // Press releases for the media // Press release: 1,000th hazel dormouse reintroduced to the UK

Conservation milestone reached as 30 hazel dormice are released into Lancashire as part of national reintroduction programme and local ‘Back on our Map’ species recovery efforts.

This week, the 1,000th hazel dormouse (Muscardinus avellanarius) will be reintroduced to the UK by wildlife charity People’s Trust for Endangered Species (PTES), Natural England and the University of Cumbria.

PTES and partners will release 15 breeding pairs or trios of rare hazel dormice into an undisclosed woodland location in the Arnside and Silverdale Area of Outstanding Natural Beauty (a nationally protected landscape covering parts of north Lancashire and south Cumbria), in an attempt to save this endangered species from extinction in the UK.

Dormouse reintroductions have taken place annually since 1993, but excitingly the dormice reintroduced this June are part of a wider species recovery programme, ‘Back On Our Map’ (BOOM). Led by the University of Cumbria and Morecambe Bay Partnership and supported by The National Lottery Heritage Fund, BOOM is a multispecies, landscape scale project which aims to reinstate 10 locally threatened or extinct native species back into the area, including hazel dormice.

With their soft caramel fur, furry tail and big black eyes, hazel dormice are undoubtably endearing, but sadly their numbers have declined by a staggering 51% since 2000, according to PTES’ State of Britain’s Dormice 2019. They are also considered extinct in 17 English counties.Carefully releasing healthy, captive bred dormice into the right habitat (that is maintained via correct woodland management practices) is the key to bringing these charismatic creatures back from the brink.

Ian White, Dormouse & Training Officer at PTES, explains: “Reintroductions are crucial to the long-term recovery of many species, but particularly hazel dormice as their decline has been so dramatic. Our first reintroduction took place in 1993, so we are thrilled that this year we’re releasing our 1,000th dormouse. This is a great milestone for conservation and a huge moment for hazel dormice in Lancashire too, as there are no known populations currently living there.”

Jo Sayers, BOOM Project Manager, University of Cumbria, says: “Dormice have long captured the hearts of everyone after finding fame through Alice in Wonderland, but despite their popularity they are incredibly rare, so it’s time to take action. This is the first of two hazel dormouse releases planned for the Arnside and Silverdale woodlands, and we hope by next summer there will be around 80 dormice living in our woodlands.”

Jim Turner, Reserve Manager, Natural England, says: “Today’s activity is part of Natural England’s work with the People’s Trust for Endangered Species to provide an ongoing programme of funding, coordination and monitoring of the dormouse recovery project. We know hazel dormice thrive in well managed woodlands, which is why we chose an area with a range of tree species and ages – from mature oaks to newly coppiced hazel – which will give the dormice plenty of food and opportunities to nest. The Arnside and Silverdale AONB is rightly proud of their fantastic woodlands, which have been cared for over many years by local landowners, conservation organisations, volunteers and woodland businesses.”

This year’s reintroduction would not be possible without months of dedication from all organisations involved, including the Common Dormouse Captive Breeders Group (CDCBG), Wildwood Trust (a key member of the CDCBG) and ZSL (Zoological Society of London). Each partner plays a key role in the reintroduction programme:

  • This year’s woodland site has been carefully chosen by the BOOM team, Natural England and PTES, ensuring that the right habitat is in place and that it’ll be maintained correctly to secure the long-term survival of the reintroduced dormice.
  • All dormice being released have been captive bred by members of the Common Dormouse Captive Breeders Group, including Wildwood Trust.
  • Before being released into their new home, every dormouse undergoes a nine-week quarantine period at ZSL (Zoological Society of London), where vets conduct regular and thorough health checks. This ensures that each animal is fit and healthy prior to release, giving them the best chance of forming a healthy population in the wild.
  • Once all dormice have been given the green light, they are carefully transported to the reintroduction location, where staff from PTES, Natural England and the University of Cumbria, along with several volunteers, will be on hand to ensure the smooth transition from travel nest-boxes to their new woodland home.

Dr Deborah Brady, Research Fellow at the University of Cumbria, who is managing the reintroduction for BOOM, adds: “Once the dormice arrive they are placed into mesh cages that mirror the woodland. The cages are filled with the right mix of foliage, buds, berries, nuts, insects and water, and this is where the dormice will live for the first 10 days. Each cage is connected to a tree, so the dormice become acclimatised to their new surroundings. Our local volunteers will check each cage daily and will also act as monitors over the next two years to ensure all the dormice remain healthy.”

After 10 days, the cage doors are opened to allow the dormice to explore their new home. In due course, when the dormice no longer need them, the mesh cages will eventually be removed.

PTES, Natural England and the University of Cumbria are aiming to coordinate a further two dormouse reintroductions in the area in June 2022, in partnership with the National Trust, the RSPB and the Arnside and Silverdale AONB.

Ian White concludes: “This is the start of a positive new chapter for hazel dormice. With two further reintroductions planned, we hope to see more dormice released in this area that can one day create a self-sustaining meta-population, which we hope in turn will result in stable populations once again living all across this beautiful region.”

– ENDS –

A Dropbox link to high-res images and footage from the reintroduction will be available for media use. For this link, or to arrange interviews with experts, please contact Adela Cragg:

T: 07532 685 614

Notes to Editors

Available for interview

  • Ian White, Dormouse & Training Officer, PTES
  • Jim Turner, Reserve Manager, Natural England
  • Jo Sayers, BOOM Project Manager, University of Cumbria
  • Dr Deborah Brady, Research Fellow at the University of Cumbria, who is managing the reintroduction for BOOM
  • Dr Tammy Shadbolt, Wildlife Veterinarian & Research Associate, ZSL
  • Georgina Gerard, Pathology and Field Technician & Wildlife Health Technician, ZSL

About PTES

  • PTES, a UK conservation charity created in 1977, is ensuring a future for endangered species throughout the world. We protect some of our most threatened wildlife species and habitats, and provide practical conservation support through research, grant-aid, educational programmes, wildlife surveys, publications and public events.
  • PTES’ current priority species and habitats include hazel dormice, hedgehogs, water voles, noble chafers, stag beetles, traditional orchards, native woodlands, wood pasture and parkland and hedgerows.
  • PTES has Species Champions for three of its priority species: for hedgehogs The Rt Hon Chris Grayling, MP for Epsom & Ewell, for water voles The Rt Hon Hilary Benn, MP for Leeds Central and Chair of the Brexit Select Committee, and for dormice The Rt Hon Matt Hancock, MP for West Suffolk and Secretary of State for Health and Social Care.
  • Visit and follow PTES on Facebook, Twitter, Instagram, YouTube & LinkedIn.

About the Common (Hazel) Dormouse Captive Breeders Group (CDCBG)

  • Formed in the early 1990’s by a group of like-minded mammal conservationists. The first releases were carried out in 1993 under the auspices of the Natural England Species Recovery Programme for the Hazel dormouse Muscardinus avellanarius. Neil Bemment has been Chairman with responsibility for coordinating the activities of the CDCBG since 2000, while the studbook is currently maintained by Suzanne Kynaston, with assistance from Hazel Ryan, at the Wildwood Trust, Kent.

About the National Lottery Heritage Fund

  • Using money raised by the National Lottery, we Inspire, lead and resource the UK’s heritage to create positive and lasting change for people and communities, now and in the future.
  • Follow @HeritageFundUK on TwitterFacebook and Instagram and use #NationalLotteryHeritageFund   

About Natural England

  • Natural England works with the People’s Trust for Endangered Species to provide an ongoing programme of funding, coordination and monitoring of the dormouse recovery project.  Natural England works for people, places and nature to conserve and enhance biodiversity, landscapes and wildlife in rural, urban, coastal and marine areas. They conserve and enhance the natural environment for its intrinsic value, the wellbeing and enjoyment of people, and the economic prosperity it brings.

About the University of Cumbria/BOOM

  • Back On Our Map (BOOM) is a 4 year, Heritage Lottery funded project which aims to engage communities in south Cumbria in restoring the landscape and reintroducing a suite of 10 locally threatened or extinct native species. The project is led by the University of Cumbria and Morecambe Bay Partnership and delivered in partnership with the Cumbria Wildlife Trust, Natural England and the Forestry Commission.

About ZSL

  • ZSL (Zoological Society of London) is an international conservation charity working to create a world where wildlife thrives. From investigating the health threats facing animals to helping people and wildlife live alongside each other, ZSL is committed to bringing wildlife back from the brink of extinction. Our work is realised through our ground-breaking science at the Institute of Zoology, our field conservation around the world and engaging millions of people through our two zoos, ZSL London Zoo and ZSL Whipsnade Zoo. For more information, visit   

Let's keep in touch...

We'd love to tell you about our conservation work through our regular newsletter Wildlife World, and also how you can save endangered species through volunteering, taking action or donating. You must be 18 or over. The information that you provide will be held by People’s Trust for Endangered Species. For information on how PTES processes personal data, please see our privacy policy.

People's Trust For Endangered Species

People's Trust for Endangered Species, 3 Cloisters House, 8 Battersea Park Road, London SW8 4BG

Registered Charity Number: 274206 • Site Design: Mike Leach Creative at Waters • Branding: Be Colourful

Copyright PTES 2023

- Enter Your Location -
- or -