Tag: rewilding

Heather from Calderglen on Ealing’s Harvest Mice

Heather Ryce releasing her captive bred harvest mice at Horsenden West meadows

“Conservation work involves the protection, preservation or restoration of nature and biodiversity, not a task one would immediately associate with Instagram or TikTok. However, more and more we are utilising social media platforms to share ideas and information, organise events and have conversations with one another regarding wildlife and the environment. It’s blending our very primal need to be one with nature with our newly evolved reliance on technology, and in most cases, it is working to the benefit of the natural world. 

In the case of releasing endangered captive-bred harvest mice back in Ealing we have Instagram Stories to thank. No, really. 

I have followed Dr Sean McCormack and Ealing Wildlife Group on social media for a while. I was inspired by the passion and innovation of both and drawn back each time on my phone by the community spirit and the sharing of wildlife photographs and information.

When Sean posted on his Instagram about a new project to return harvest mice back in a suitable habitat and monitor their population I paused my Netflix show, put my glass of red wine back on the coffee table and furiously began constructing my reply. I had to be involved. 

I work as an Animal Keeper and Education Officer at a small zoo in South Lanarkshire, Scotland. We care for a very successful breeding group of harvest mice and had been on the look out for a while for a project to introduce our mice back into the wild, as we were reaching maximum capacity in their enclosure. 

Some of the first Calderglen mice installed in EWG’s brand new captive breeding programme HQ

We had explored options in the past, but nothing seemed to work out or last. I wanted a project that Calderglen could fully get behind and believe in, and that gave our Scottish mice the best chance at surviving. 

After talks with Sean I knew the area chosen for their release and the people involved offered the harvest mice the best chance at restoring a wild population in Ealing. A species that hasn’t been recorded there since the late 1970s. It was time for that to change. 

After a couple of months of more conversations and planning with Sean the morning arrived for the long journey down to London. I plucked the fittest mice from the safety of their captivity, clinging unknowingly to their corkscrew hazel branch and silently wished each one good luck as I placed them into the travel box, awaiting a life of freedom only wild animals understand. 

It’s not lost on me the control humans have over non-human species and even though in my heart I knew I was doing the right thing for the conservation of harvest mice, looking at each individual twitching face, I also battled with doubt if it was what they would want. 

It may seem silly, after all how could a mouse possibly understand the concept of consent and the importance of its little life in the preservation of its entire species, but it certainly picked at my moral compass regardless. 

It’s why I take so much comfort in Ealing Wildlife Group’s project because out of the many that have been reviewed by Calderglen this one surpassed expectation. 

Heather Ryce at Horsenden Farm, ready to go release her precious charges into the wild

It was a lovely evening when I met with members and volunteers of Ealing Wildlife Group and I quickly felt I was with ‘my people’. Our enthusiasm and passion kept the chat flowing as the sun started to dip and the smiles and laughs just got wider and louder even after we stopped recording videos on our phones. Everyone was excited to be there, everyone wished for the success of the project, and everyone believed it was the right thing to do to give back to nature. 

Heather and EWG’s Caroline and Sean chat to passersby about the mice and reintroduction programme

We let Calderglen’s mice go in thickets of grass and flowers, with a small shelter and some food left behind for a short-term resource if they should need it. I watched one particular brown and white fuzzy ball dart immediately from the travel box and wind its way gracefully into the foliage. 

Heather, Sean and Caroline assess a likely release location for one group of mice

A bubble of emotion rose in my throat as I again wished it a silent good luck. As I uploaded the video to my Instagram with the caption ‘They’re free!’ and watched the mouse get lost behind stalks of green and fade from view, my doubts vanished. The harvest mice were home. “

The door to their soft release tank (with familiar food, water and shelter) is open, and they are free to be wild again…

Heather Ryce

Animal Keeper and Education Officer

Calderglen Zoo

(All photo credits to Council ranger James Morton, who accompanied us on this release alongside fellow ranger Jon Staples to whom we are grateful for collaborating on this project)

New Harvest Mouse partnership with Battersea Children’s Zoo

Battersea Harvest Mice

We’re very excited to be partnering with Battersea Children’s Zoo and their sister zoo, New Forest Wildlife Park, both of which will be providing us with captive bred harvest mice to release in Ealing over the coming years. I recently visited Battersea and was astounded by their beautiful Harvest Mouse exhibit, which showcases just how busy (and adorable) these little mice are. Here’s what Head Keeper, Jamie Baker, has to say about the partnership:

“Battersea Park Children’s Zoo has always championed British native species. Alongside our conservation work with other BIAZA and EAZA facilities on European Endangered Species breeding programmes we have always worked to put our own native species at the forefront of our work. As one of most successful zoos working with the Scottish wildcat breeding programme, producing 5 kittens over the last couple of years, we also collaborate on reintroduction projects for native hedgehogs and of course, Eurasian harvest mice, which are increasingly threatened in Britain. 

Battersea Children’s Zoo Harvest Mouse enclosure


We currently have one of the largest harvest mouse exhibits in the country and actively breed mice at the zoo before transferring them to reintroduction projects up and down the country. Education is key in providing a future for our native species, so our dedicated harvest mouse barn is a great opportunity for our yearly 8500 school children to connect with these relatively unheard of creatures. 


We are excited to have struck a new partnership with Ealing Wildlife Group and can’t wait to shine a light on their amazing work to restore wild places in London and reintroduce native species. Our curator Jason and head keepers Jamie and Charlotte had the pleasure of welcoming Sean to the zoo recently to discuss our joint passion for harvest mouse conservation and we look forward to providing captive bred harvest mice to Ealing Wildlife Group’s upcoming release projects. Joining forces to rewild some amazing habitats in West London.”

The team at Battersea and New Forest are also keen to come help us survey for harvest mice to monitor how well the reintroduction project is going over the coming years. There will also be opportunities for volunteers to help with this important work. Exciting times!

Rewilding Ealing: Harvest Mice

Photo: Harvest Mouse by Amy Lewis, The Wildlife Trusts

This Friday Dec 4th at 8pm, join Sean McCormack for an online discussion about a potential reintroduction project of Harvest Mice in Ealing. We’ll be exploring whether we have Europe’s smallest rodent species in the Borough, how we might find out with some help from our members, whether we still have suitable habitat and why such a project might be beneficial to people and biodiversity.

This is hopefully the first in a series of talks exploring rewilding and nature conservation in Ealing.

There are 100 spaces; first come, first served. Please do join live so you can take part in the Q&A afterwards. A recording of the session will be posted after for those who missed the live event.

The meeting will be on Zoom, details as follows:

Ealing Wildlife Group is inviting you to a scheduled Zoom meeting.

Topic: Rewilding Ealing: Harvest Mice

Time: Dec 4, 2020 08:00 PM London

Join Zoom Meeting

https://us02web.zoom.us/j/83855182276…

Meeting ID: 838 5518 2276Passcode: 581930