Conservation

Author interview with Merlin Hanbury-Tenison: Our Oaken Bones

Haunted by war and loss, Merlin and his wife Lizzie leave the bustle of London and relocate to his childhood farm in Cornwall, only to find new battles awaiting them; crippling debt, a fragmented ancient rainforest, and Merlin’s father struck down by COVID-19. Drawn into the rainforest’s depths, they discover a desperate fight for survival, aiming to save this magical habitat while trying to heal from their own battles.

Merlin Hanbury-Tenison is a Cornish conservationist and veteran who founded The Thousand Year Trust, Britain’s rainforest charity. The charity’s mission is to catalyse the movement to triple Britain’s rainforest cover to one million acres in the next thirty years. His work has been featured in National Geographic, the Guardian and on the BBC. Merlin lives in a rainforest in Cornwall with his wife Lizzie, an entrepreneur and business leader, and their two young daughters.

We recently had the opportunity to speak to Merlin about his first book, including how he came to write it, how important he thinks species reintroductions are in Britain, which challenges he’s faced and more.

Can you tell us a little bit about yourself, and what inspired you to write Our Oaken Bones?

I was born and brought up on Bodmin Moor on a small upland hill farm with a slice of stunning and rare ancient Atlantic temperate rainforest at its heart. I left to join the army when I was 19 and served on three tours of Afghanistan. After returning, I began to suffer from complex PTSD and found the rainforest to be the best place to escape to and heal. At the same time my wife, Lizzie, was also suffering psychologically having gone through two traumatic miscarriages and my father had almost died from very severe Covid. All of us found the rainforest to be the best place possible to heal, restore and recover. I was inspired to write Our Oaken Bones as I want everyone to have access to the kind of healing that we experienced, and for all of us to use that knowledge to heal the rainforests of Britain in return. We used to be a rainforest island with 20% of our landmass covered by this beautiful habitat but almost 99% of it has been cut down and destroyed. I hope that Our Oaken Bones might act as a catalyst to ensure that this is the bottom of the bell curve and that we don’t destroy any more of this vital habitat. With every year that passes I hope that we will see more rainforests being restored and planted across our western uplands.

Merlin as a child high in the rainforest canopy, exploring with his father. — Merlin and his father in the rainforest as a child.

This book blends elements of biography, natural history, and scientific discussions to combine your personal journey with biodiversity and the pioneering research being undertaken at Cabilla. What motivated you to adopt this multi-faceted approach to writing?

We are all a part of nature, not apart from it – I am passionate about helping people to realise and remember this. It’s easy to say but much harder to feel. I thought that writing a book about trees would appeal to a small audience who are already interested in that subject. Writing a book about the people who live in, and are working to save these rainforests, felt like a subject that would be more engaging and would capture people’s interest. Rainforests are stunning, vital and rare. All I hope for is that people who didn’t even know that we have rainforests in the UK will read this book and finish it in love with the habitat and passionate about saving them. These are our most romantic and folkloric spaces, but many people are unaware of them or their decline. I hope that by weaving personal, historic and scientific narratives together we can shine a light on this important subject.

In Chapter 6, you detail your successful journey reintroducing beavers to Cabilla in 2020. How important do you think reintroducing native species to the UK will be in restoring our natural world, and are you hoping to introduce any other species to Cabilla?

I believe this is a vital area. We live on an island – if important native species are removed and new, non-native species are introduced the results can be catastrophic. This is well understood on islands like Australia and New Zealand, but in the UK, we seem to have a bit of a societal blind spot about it. Returning beavers to the Cabilla Valley has created the most wonderful explosion in biodiversity and habitat abundance. The change was near immediate and very evident. I believe that we can create similar improvements in the British countryside with the slow and careful return of other species, like Pine Martens and wild cats. This should never be rushed, and the most important focus area is ensuring that everyone in a catchment or a release area is on side and positive about the changes. This is all part of the effort to return to a more equilibrious state of British flora and fauna where species that evolved here are interacting in a more natural way together. It’ll be a very long process, multi-generational, but I’m positive that as long as we all remain optimistic we can restore much of what we’ve damaged and lost over the previous centuries.

There is often friction between conservationists and farmers in relation to the effects of livestock on landscapes, but I really enjoyed hearing about your work with farmers to create a blueprint for new farming methods focusing on ecological and economic benefits. How important do you think the shift from working against farmers, to working with them, in conserving our shared landscape will be?

This will all be impossible without the farming community. About 70% of the UK is farmland so we will never be able to combat climate change, restore biodiversity or bring back our rainforests if we don’t work closely and compassionately with farmers. This should never have been an issue historically and I believe it comes from a place of misunderstanding and poor communication. Conservationists and farmers should be the closest of collaborators and colleagues. We are all striving for the same goal; a Britain which provides food for all those who live in it, has an improving and resilient countryside and is full of some of the most stunning natural habitats on earth. Farmers are the key to making this happen and we can help them by ensuring that Government is providing them with the support and guidance to farm in a way that meets all these goals.

The Cabilla Cornwall Retreat offers a unique space for wellness groups, veterans, key workers and individuals to experience the wonders of nature. What are the key benefits of connecting with nature for well-being, and how does this align with the broader goals of the Thousand Year Project?

There is some simply stunning research underway which demonstrates how spending time in native rainforest environments can be beneficial for human psychological and physical health. I am a living example of this, as are many of my family. We have brought a large number of people into the Cabilla Valley as part of the retreat business here and the impacts have always been heart-warming and invigorating. We always do this work with a focus on the habitat first to ensure that we aren’t bringing people into the rainforest at the detriment of the habitat. This is very important. We are currently living through a mental health pandemic and an obesity crisis. There are many reasons for both of these issues and there are also many cures and methods to help alleviate them. The natural world, and rainforests in particular, are a key weapon in this fight. I would never claim that they might replace clinical or pharmacological healing, but we must begin to view all the options side by side and not in isolation. I have seen such marvellous healing impacts in the valley here and I believe that everyone in the UK, especially those who live in urban areas, should be encouraged and assisted in accessing nature as part of their general health and wellbeing.

Have you faced any significant challenges over the past few years that you can share with us?

So many! This would be another book in itself. Running a small business has been an adventure but I won’t pretend that it hasn’t been extremely difficult. The state of our economy and the environment for small business owners is pretty dreadful in the UK right now. When you add that Cabilla is a hospitality business set up during the Covid lockdowns and have then had to survive through all the financial conniptions that our country has been going through, it has resulted in many sleepless nights. Setting up a charity is also a very challenging undertaking and the ability to fundraise at the moment in the UK is particularly difficult. It took me over a year to convince the Charity Commission that we even have rainforests in the UK and that’s before we even entered into the treacle-like bureaucracy of the charity sector. Running a farm is also very challenging at the moment as we have departed the EU, therefore the subsidy systems are changing which has created a number of very difficult financial implications that we’re still trying to work through. This is all before I even come to the difficulty of reintroducing beavers and then keeping them in their government mandated enclosure – but there’s a whole chapter on that in the book, and I don’t want to spoil the fun here!

What do you hope other landowners can learn from the pioneering and vital work you’re doing?

My hope is that the Thousand Year Project that we have started in the Cabilla Valley will act as a blueprint for other interested farmers and landowners on the uplands who are looking to evolve and transition their farming techniques to one that works with nature rather than against it. We are a small farm and below the average farm size across the UK, so this isn’t some unachievable large-scale project that the average farmer wouldn’t be able to do. Everything that we have done here has been designed to not only repair biodiversity and the habitat but also to create a more resilient farming business model under the new subsidy and farm payments system. My hope is that others will take some of what we’ve done here and implement it on their own farms. This is how we will one day come to see rainforests across the uplands and once again view them as a bedrock of our cultural landscape.

Finally, what are your hopes for the future of Cabilla?

I would love to find a way to bring the valley into some form of public ownership so that the work that has begun here will be guaranteed and continue long after I have gone. The whole point of the Thousand Year Project was to create a multi-generational effort. This should be how all land strategy is viewed and conceived. I want my own children to feel free to do whatever they choose to with their lives in the knowledge that the rainforest restoration that we have begun at Cabilla will outlast all of us. I hope that this will become a national project that truly continues until our rainforests have returned across much of our uplands.

Our Oaken Bones is available from our online bookstore.

This Week in Biodiversity News – 3rd March

Environment

UK scientists have discovered a biological mechanism making plant roots more attractive to soil microbes. Through enhanced endosymbiosis, crops such as wheat and legumes are now able to scavenge nutrients more effectively from the environment with the help of soil microbes. This natural process reduces the reliance on synthetic fertilizers, which, when used excessively, can contribute to soil degradation, water pollution, and harmful algal blooms. This biological adaptation may result in crops requiring less artificial fertilisers, thus reducing the pressures of excess fertilizer use and opening the door for more environmentally friendly farming.

Spraying the plants in the crocus fields by International Labour Organization ILO, via flickr.

A recent study involving over 35 research teams has revealed that accelerated glacial melt presents a profound threat to global water security. The loss of 6,500 billion tonnes of ice since 2000, averaging 270 billion tonnes annually, directly impacts millions who rely on these freshwater reserves. This latest study underscores the critical role of glacier melt as a sensitive and alarming indicator of climate change, and demands immediate attention to mitigate the cascading global consequences.

Conservation funding bias is depriving critical species of vital support, a new study has shown. A recent study investigated over 14,500 projects spanning a 25-year period, analysing almost $2bn of funding allocated across the globe. Of this, 82.9% of funding was allocated to vertebrates (with over 85% to birds and mammals), 6.6% was allocated to plants and invertebrates, and only 0.2% was designated for fungal and algal species. With a large majority of funds assigned to charismatic megafauna, this bias leaves nearly 94% of threatened species with no support, limiting the opportunities for researchers and protective measures. Researchers have called for a revision of conservation funding awards to ensure a more rigorous, scientifically driven approach in order to address this funding imbalance.

Sanglier by Philippe Rouzet, via flickr.

The reappearance of Wild Boar in Dartmoor National Park, after centuries of absence, has raised concerns about ‘guerrilla rewilding’. Despite their potential for ecological regeneration through natural foraging behaviours, the boar’s presence, following sightings and a dog walker incident, has triggered debate. Natural England and the Wildlife Trusts are now working to understand the local population dynamics and provide guidance to mitigate human-wildlife interactions, while the overall impact of their presence continues to be evaluated.

The UK government has authorized nature groups to apply for licenses to release beavers into the wild. This decision formalises existing practices, which include both licensed enclosure releases and unauthorized reintroductions. With an estimated 500 wild beavers in England already contributing to habitat creation and flood mitigation, the first of these licensed releases are anticipated this autumn, aligning with broader nature restoration goals in the UK.

Climate Crisis

The UK has released its National Biodiversity Strategy and Action Plan (NBSAP), outlining its commitment to meeting international biodiversity targets by 2030. This plan serves as the UK’s response to the Kunming-Montreal Global Biodiversity Framework, acknowledging the critical reliance of human wellbeing on thriving ecosystems and the urgent need to address the global biodiversity crisis. The NBSAP emphasizes a shift towards a systemic approach tackle these challenges effectively. This publication marks a crucial first step in the UK’s pledge to protect at least 30% of its land and sea, reduce pollution, and ensure sustainable practices in agriculture, forestry, and industry by the year 2030.

Researchers at the University of Leeds have modelled the potential impact of reintroducing wolves to the Scottish Highlands, revealing significant opportunity for woodland expansion and carbon storage. Using a predator-prey model across four areas of Scottish wild land, the study found that a population of approximately 167 wolves could effectively control burgeoning deer populations, which currently suppress natural woodland regeneration by grazing on saplings. A reduction in deer would allow native woodland to flourish, with the potential to sequester 1,000,000 tonnes of carbon dioxide annually. This first-of-its-kind assessment provides compelling evidence for the crucial role of large carnivores in delivering nature-based solutions to the climate emergency.

Author Interview with Dan Bagur: Pine Marten

Offering new insights into how they grow, learn and live, Pine Marten delves deep into the secretive behaviour of one of our rarest and most elusive mammals. Packed with stunning candid images and a library of behaviours and vocalisations, this groundbreaking book provides insight into Pine Marten social interactions, courtship, mating, nesting and kit rearing, feeding and diet, as well as their relationships with other wildlife.

Having spent several years watching and filming Pine Martens in the forests of Austria, Bavaria and Ireland, Dan Bagur has developed an in-depth understanding of their habits and behaviour. He has written or contributed to over 26 books on nature, and his wildlife photography, artwork and articles are published all over the world.

We had the opportunity to speak to Dan about Pine Marten, including his inspiration for the book, his hopes for the future of Pine Martens in the UK and more.

Can you start by sharing how you first came to work with Pine Martens, and what was the journey that led to the publication of this book?

Before answering, I was pleased when my publisher told me that you wanted to interview me. I’m a lifelong admirer of the NHBS. I used to get your catalogues delivered as a teenager back in the early 90s when you were still a mail-order book catalogue – I’ve bought and enjoyed many books from you over the years.

Back to your question. Yes. As a nature lover, I’ve always wanted a house surrounded by wildlife. When I moved to Ireland, it finally became a reality. The first time I viewed the house, I found a Pine Marten scat in the garden! It’s a dream for someone like me to be surrounded by these endangered mammals and I’ve been watching their behaviour ever since. Being so elusive, they represent a significant challenge to the wildlife photographer/filmmaker, it occurred to me that Pine Martens would be one of the toughest land mammals to study in the wild – observing them is so rewarding precisely because it’s so difficult. You must earn every new insight.

Direct observation is the best way to learn; the animals themselves are the primary source after all. It starts with interest but quickly becomes, well, the word that comes to mind whenever I think about exactly how to define it is joy. Joy can be very addictive. It’s hard to let go of that feeling. Being plugged directly into the Pine Martens and their daily lives is exciting.

Pine marten at night — Pine Marten at night. ©Dan Bagur 2025

A long field study enables you to get a much clearer picture of what’s really happening: you get to confirm and reconfirm your initial assumptions, connect to individuals and see their interactions and behaviour over an extended timescale. I’ve been observing wild Pine Martens for over five years now – I’ve spent many thousands of hours following, watching and photographing them. I’ve encountered many individuals and seen them climbing, courting, growling, chattering, hunting, feeding, fleeing, fighting and rearing their young. Every month I learned something new and understood them a little better. It’s a great help too that Pine Martens fit nicely around a full-time job – most of the action takes place at dawn and dusk, or during the night. I got drawn into their world. I often wonder what they’re doing while I’m not with them.

As Pine Marten populations slowly begin recovering, interest in them is growing and I thought that my observations could be of interest to other naturalists. Conservation relies heavily on public sentiment and if people don’t know about Pine Martens, they will be less likely to help them. Introducing this animal to others was something I felt I could do. Hopefully, after reading this book, the reader might offer Pine Martens their much needed support. I put the focus of the book on Pine Marten behaviour. It’s aimed at amateur naturalists or anyone who is interested in learning more about these incredible animals, and contains lots of new information and photographs that will be interesting to those who already know Pine Martens well.

What was the most surprising or exciting thing you learned in the process of writing Pine Marten?

I think it’s exciting that you can still go out into the woods and make new discoveries about British mammals. Although I studied biology at university, and have always worked in conservation related roles, I don’t work with Pine Martens professionally. That’s part of the magic of direct observation – anyone can do it. There are still many new discoveries out there just waiting to be made, all that’s required is consistency and patience.

I think the most surprising things are how vocal Pine Martens can be and how exciting each sighting still is – even after many years watching them. When they show up it’s always an ‘oh wow!’ moment. I still freeze with awe when I see one.

The most fascinating thing is their intelligence. Watching them solve problems and consider their next move, getting to know many individuals and seeing how unique each animal is – their personality and behaviour are highly individual. Often, I could tell who had visited simply by the signs they had left behind. They’re exceptionally charismatic animals. As I explain in the book, they’re also deeply connected with our historic wilderness landscapes, icons from our lost ancient wildwood.

This book has an impressive selection of imagery displaying a range of behaviours, interactions and life stages. How long did these images take to compile and what are some of your most effective strategies for spotting these elusive creatures?

Thanks. Yes, capturing Pine Marten behaviour isn’t easy. For every photo there were many failed attempts, you have to be comfortable in failure with Pine Martens. Over time, patience brings results and consistency is the key. The situation is made especially testing as it’s often at night and it can be very cold. You have to be willing to spend many thousands of hours sitting quietly in the woods and waiting for the occasional glimpse! For this reason, you have to really want to do it. You need to be passionate about understanding them.

I’ve taken over 10,000 photographs of Pine Martens over the last five years. Each year I understood a bit more about when and where I might see some new behaviour. Because they’re so elusive, learning to track them is essential. It’s vital that you wait as close to the right place as possible. It’s a waiting game – many quiet hours watching the forest, followed by a few seconds of heart racing panic as they emerge from the undergrowth and then quickly disappear again. Over time, it’s possible to build up a behavioural picture from many of these fleeting encounters. The harder something is, the greater that feeling of accomplishment.

Aside from sitting and watching, I also use trail cameras and camera traps to enable me to capture as much behaviour as possible. As you say, I’ve included over 200 photographs in the book because I felt that it was important to show the reader the behaviour that was being described. No number of words beats seeing behaviour in a photograph (or series of photographs as is often the case in this book). Young Pine Marten. ©Dan Bagur 2025

Can you tell us more about your new discoveries in Pine Marten behaviour and biology?

I didn’t set out to discover anything new. Initially, I didn’t plan to write a book. I just wanted to watch them and understand as much as possible – I was curious about how they lived their lives and what they got up to. As previously mentioned, I’ve spent over five years sitting quietly and observing wild Pine Marten behaviour. It took many months before I even knew where to wait for them. I love being alone in nature, so even the downtime in the forest has its own magic. My efforts were rewarded much later when I realised that some of my findings were new discoveries, including a new understanding of the function of the famous Pine Marten wiggle, retromingency in Pine Martens, the true cause of the scat curl and the use of the marten maze. I don’t want to give too much away, but they are all described (along with many other aspects of Pine Marten behaviour) in this new book.

Chapter 5 has an extensive library of field recordings. Why did you feel this was important to include and can you tell us about the process of gathering these?

It’s important to record what you’re seeing while watching wild animals, if you don’t then you can’t share your findings with others. Over the last few years, I’ve built up a large collection of film footage, photographs and sound recordings. Few people have ever seen a wild Pine Marten, let alone heard one. Their calls are an important part of what makes them what they are. Pine Martens (like many other Mustelids) make a surprisingly diverse range of calls – they grunt, growl, purr and scream. I felt it was important to include these. They are quickly and easily accessed by scanning QR codes using your phone. I wanted the reader to get as close as possible to Pine Martens via this book.

I realised that the recordings I had built up were unique – the Pine Marten sound library in this book is the most comprehensive yet published. My recordings have been included in the British Library sound collection and have been published in the ground-breaking book Sound Identification of Terrestrial Mammals of Britain & Ireland by Pearce, Middleton, and Newson.

What does the future look like for Pine Martens in the UK? And how can we work to secure a brighter future for this species?

In short, hopeful but worrying! Sadly, much of this is our own doing. Urban sprawl and habitat loss are an obvious problem, climate change, biodiversity decline and a persecution driven genetic bottleneck add to these issues – among others. Apathy is also a big concern. We still prefer the comfort of fool’s paradise over the often-harsh difficulties of reality. We need to get our heads out of the sand – and fast! Reality will inevitably have consequences we are no longer able to hide from – not just for Pine Martens. As Tew et al stated in a 2024 paper on the future of UK woodland biodiversity, a ‘major cultural shift’ is urgently required.

Although it’s important to face our problems and act, it’s also important to remain positive. There is real cause for hope – important work is being done to help Pine Martens. A few of those making a huge difference are Johnny Birks, Jenny MacPherson, Stuart Edmunds and John Martin, but there are many others. When great people come together fantastic things can be accomplished. The UK and Ireland have plans to increase their much-depleted forest cover over the coming years, and Pine Martens are slowly coming back. There are ways we can all contribute by donating or volunteering. Even small acts, like rewilding our own gardens, can collectively have an impact. Writing in 1992, the acclaimed science writer Edward O Wilson stated that ‘The next century will, I believe, be the era of restoration in ecology’. I hope that he’s right – wouldn’t that be a fantastic thing to witness after the global habitat and biodiversity decline of recent years.

Finally, what’s next for you? Will there be more books in your future?

Yes, I hope so! I had a column on rock pool life in the local newspaper while I was at university and I’ve been writing in one form or another ever since. I’m always working on the next project. Writing forces you to read everything and really understand your subject deeply, and that brings its own reward.

I would like to do something with Puffins in the future. I’m inspired to continue spending time out in nature and see what else is waiting to be discovered. Whatever comes next, I will always be grateful for this time with the Pine Martens – so many wonderful memories and experiences. The Pine Martens will remain with me for the rest of my life. Once you get to know a family of Pine Martens there’s no going back. They’re incredible animals and we’re extremely lucky to have them living alongside us.

Pine Marten is available from the NHBS website here.

Q&A with Trine Bregstein: The Riverfly Partnership

The Riverfly Partnership is a collaborative effort between anglers, conservationists, scientists, and water managers to protect the health and quality of our rivers. They use citizen science to monitor riverfly populations, which are sensitive indicators of water quality, and gather data on these fascinating insects to contribute to a better understanding of river ecosystems.

We recently had the opportunity to speak with Trine Bregstein, riverfly partnership development manager, about the work of the Partnership, their citizen science initiatives, the importance of riverflies and more.

Can you give an overview of the Riverfly Partnership, its aims and the work that the group is involved in?

The Riverfly Partnership is a network of organisations supporting projects to assess river health. The aims of the partnership are to protect the water quality of our rivers, further the understanding of riverfly populations, and conserve riverfly habitats. The partnership comprises many individuals and groups, including entomologists, angling clubs, volunteer groups, wildlife charities and Rivers Trusts.

We have data on freshwater invertebrate life dating back to the early 2000s, collected by a dedicated base of citizen scientists that is continuing to grow. Volunteers get to learn about the fascinating world of tiny critters living in their waterways, which are referred to as the canaries of our rivers because they are an important indicator of water quality. The work of Riverfly monitors means pollution incidents are quickly detected and reported, changes in water quality are monitored over time and the impacts of restoration work in and around the river can be tracked.

Can you tell us about the Riverfly Monitoring Initiative?

The Riverfly Monitoring Initiative (RMI) is a citizen science scheme in which trained monitors collect data about the invertebrates living in their local river. Volunteers are trained in the identification of key groups of riverflies, which are invertebrates that spend most of their life cycle living in fresh water. The initiative mainly focuses on the orders Ephemeroptera (also known as up-wing flies or mayflies), Plecoptera (stoneflies) and Trichoptera (caddisflies).

Invertebrate sorting and identification. Credit: Trine Bregstein

On a monthly basis, monitors carry out kick sampling at their site and count the numbers of each group of riverflies they have collected. From these counts, an RMI score is generated. This score is compared to the ‘trigger level’ of the site, which is a number set by the local ecology contact at the statutory body. If the RMI score is below the trigger level, it may be an indication that a pollution event has taken place. Another sample is done to confirm the breach, and then the relevant authorities are informed.

What are the main challenges associated with your work?

The national scale of the project, with various regional hubs coordinating groups of monitors at a local level, means it’s important to make sure things are done consistently across the network. We at the Riverfly Partnership HQ in the Lake District facilitate and try to keep track of what’s going on in all of these separate groups, and make sure training and protocols are standardised around the country to ensure the robustness of the data set. This can prove challenging, particularly as many of our hubs are charities and trusts that may not have consistent funding for citizen science projects, whilst others are volunteer run and rely on people managing to co-ordinate their groups in their spare time.

A group of volunteers standing around the riverside edge during a training day — Ribble training day. Image credit: Trine Bregstein

How did 2024 fare for the Partnership and its work?

2024 was a great year for the Partnership. Our monitors submitted 7,832 surveys to our database over the year – this is up from 6,392 in 2023, which reflects how much the partnership is continuing to grow, with many new monitoring groups set up all over the UK. We also launched a new Riverfly data dashboard for easy viewing of all this data.

Citizen science is of increasing importance in wildlife conservation across the globe. How can we get involved and be proactive in protecting our rivers and riverfly populations?

Riverfly monitoring involves carrying out a survey at your allocated site once per month, usually taking about an hour. As a monitor, you’d be contributing to a trusted, long-term, open-access data set that can be used to track gradual changes in habitat quality, as well as quickly pick up on any major incidents that the statutory body can investigate. Anyone can become a Riverfly monitor – no prior knowledge is required; you just need to have attended a training day led by one of our accredited tutors.

Kick sampling in a river — Gwent Wildlife Trust sampling. Image by Gareth Edge

If you’re interested in becoming a volunteer, e-mail info@riverflies.org and we will link you up to your local co-ordinator. Most training tends to take place in the spring and summer months, but you can register your interest at any time.

Aside from Riverfly monitoring, you can also get involved in the Rivers Trust’s Big River Watch, Earthwatch has the Great UK Water Blitz, The Angling Trust has the WQMN (Water Quality Monitoring Network), ZSL run the Outfall Safari project, and through the CABA and CaSTCo projects other organisations around the UK have been able to cascade this initiative to their volunteers. Check your local Rivers Trust or Wildlife Trust to see what volunteering opportunities they have, for example balsam bashes, riverside clean ups or restoration works like reed bed planting, tree planting and fence building.

Gwent Wildlife Trust members holding certificates following training — Gwent Wildlife Trust training. Image credit: Gareth Edge

There is so much to get involved with, and on a personal level, try look after your own patch. If you’re out walking the dog for example, try to keep them out of the water if they’ve had a recent flea treatment, take a couple of bits of rubbish to the nearest bin (safely, don’t pick up anything potentially dangerous) and know who to call if you spot something untoward – the EA/SEPA/NRW/NIEA for pollution, your local council for fly tipping and don’t forget to report sewage and water leakage problems to your local water company too, they all have helplines or online reporting options.

What projects will the Riverfly Partnership be working on next?

We have a scheme called ‘Extended Riverfly’, which is a more advanced version of Riverfly monitoring that experienced monitors can move on to. It involves identifying and counting 33 groups of invertebrates, rather than the eight in the Riverfly Monitoring Initiative. It’s a fairly new scheme, currently only operating in certain parts of the country, but we recently held an event at which many Riverfly trainers upskilled to become extended trainers, so we’re looking forward to rolling out this project to many more groups in the coming year.

Extended training at the natural history museum — Extended training at the Natural History Museum. Image Credit: Trine Bregstein

We’re also working on our ‘Targets and Triggers’ project, which has been developed with partners at the Environment Agency, the Scottish Environment Protection Agency, Buglife and CaSTCo. We’re aiming to devise a standard, and relatively easy, method for trigger levels to be set, making it easier for statutory bodies to engage with Riverfly monitoring without it being too much of a drain on their limited resources. Through gathering extra data about each monitoring site and running these through a predictive model, we plan to come up with not just trigger levels, but expand the initiative so that sites also have a ‘target level’ – the maximum RMI score that we would expect to see at a site, which gives a goal for habitat improvement projects to aim for.

The Riverfly Partnership Approved Kit is a complete kit suitable for water quality monitoring. The Riverfly Partnership receives £5 from the sale of this kit to help them continue their fantastic conservation work.

Please see the Riverfly Partnership website for more information on how to get involved.

Conservation volunteering with the Dartmoor Preservation Association

Last month, NHBS colleague Dan volunteered with the Dartmoor Preservation Association – read below to find out what he got up to.

Walking across Dartmoor, you feel centuries of history embedded in its rugged landscape. The open moorlands, rolling hills, and ancient stone circles are more than just features – they’re fragments of a rich past. Volunteering with the Dartmoor Preservation Association (DPA) reminded me how essential the work is to protect the unique heritage of places such as these.

Founded in 1883, the Dartmoor Preservation Association is one of Britain’s oldest conservation organisations and is focused on safeguarding Dartmoor’s landscapes, wildlife, and cultural heritage. The DPA works tirelessly to protect the moors ecological balance and preserve the archaeological sites that reveal Dartmoor’s deep connection to human history. The organisation advocates for responsible land use, defends against damaging developments, and promotes awareness of Dartmoors irreplaceable natural and historical value.

Among Dartmoors treasures, situated by Huccaby Tor near Dartmeet, stands a quiet reminder of the Bronze Age (c.2000-700 BC) – Huccaby Rings. A monument scheduled under the Ancient Monuments and Archaeological Areas Act 1979, it is one of many ancient sites on Dartmoor that were built to hold livestock, protect crops and / or to accommodate farmers and herdsmen.

It wasn’t too surprising that when I joined the DPA to help clear the ring of Gorse, I was joined by several archaeology enthusiasts, each keen to help preserve this window into Dartmoor’s ancient past and ensure that Dartmoor’s story lives on for future generations.

Conservation volunteering goes beyond hands-on work; it’s a commitment to protecting the legacy of places like Dartmoor. Each task – preserving historical heritage, supporting wildlife habitat, managing access – is a step towards safeguarding unique beauty, preserving cultural history and supporting wildlife.

I’m certain that you, the reader, also have a special place near you – whether urban or rural – that deserves this kind of dedicated care.

Find our more on the Dartmoor Preservation Society website.

Recommended reading

Dartmoor 365
A true gem of a book, it has a story about every square mile of Dartmoor, filled with captivating folklore, historical insights, archaeology, and nature facts. An intimate exploration of a unique part of the world.

The Volunteers: A Memoir of Conservation, Companionship and Community
When Carol finds herself single and unemployed, she unexpectedly takes on the role of leading a quirky team of countryside conservation volunteers. Although their first days are rocky, she and her diverse group of volunteers bond over nature, finding friendship, purpose, and a renewed sense of belonging. The Volunteers is a heart-warming story about healing, community, and the redemptive power of the outdoors.

This Week in Biodiversity News – 17th February

Environment

A new restoration project is set to enhance RSPB Geltsdale in northeast Cumbria. The project aims to restore and protect vital habitat across the site, including moorland, wetland and woodland. These enhancements will benefit a number of species including Hen Harriers, Curlews, Snipe, Willow Warblers, Black Grouse and Red Squirrels. RSPB will be working in partnership with North Pennines National Landscape and Natural England for the project, building on the previous conservation successes in Geltsdale, which include renaturalising a river, native tree planting, meadow creation and restoration of blanket bogs.

Ireland’s remaining ancient rainforests are under threat from the rapid expansion of pine monoculture plantations. Despite government efforts to increase woodland cover, the country’s focus on non-native pines is proving detrimental to biodiversity and ecosystem health. Ireland has the lowest proportional tree coverage of all European territories – the Irish Republic reports 11.6% coverage while Northern Ireland has just 8% – despite investing over £1bn into forestry schemes to increase woodland cover. This widescale industrial approach is replacing lost woodland with monoculture, enhancing both ecological decline and rural depopulation. Experts emphasise the need to identify and protect the remaining ancient woodland to safeguard the future of ancient Irish rainforests.

Derryclare Wood by Nils van Rooijen, via flickr.

Experts warn that the world’s peatlands are dangerously unprotected. Despite covering only 3% of land, peatlands store more carbon than all of the world’s forests and are crucial for biodiversity and water management. With only 17% of this vital habitat within protected areas, their draining, overgrazing and burning driven by agriculture and extraction is emitting greenhouse gases that would make peatland the fourth biggest polluting country in the world. With over ¼ of peatland under heavy anthropogenic pressure, experts are emphasising the need to restore and conserve existing peat to keep global warming in line with international targets.

Wildlife

Over one thousand dead sea turtles have been found along India’s coastline. An estimated 1,100 Olive Ridley Sea Turtles have washed up on the beaches of Tamil Nadu in southern India. The stranded turtles were found with bulging eyes and lung lesions, indicating death by suffocation and drowning – although it’s difficult to determine, it is possible that net fishing in the area may have caused entanglement and drowning in these animals. Since the incident, local government have created a task force and increased night patrols to protect the hatchlings from harm.

25082: olive ridley sea turtle by Panegyrics of Granovetter, via flickr.

A drove of feral pigs have been illegally released in the Cairngorms. In the wake of the illegal release of Lynx last month, a group of feral pigs have been spotted near the Uath Lochans area, less than five miles from the release site of the Lynx. Working with NatureScot and Forestry and Land Scotland, the Cairngorms National Park Authority is working to investigate the release of these animals and safely capture them.

Policy and Development

The UK government remains committed to Heathrow’s third runway, despite significant environmental and social concerns. The expansion could see a further 4.4 million tonnes of carbon dioxide emissions each year – the equivalent of 101 billion car miles which could have destructive consequences in terms of pollution and the environment. The expansion could generate 51 million tonnes of carbon in five years, over 500,000 people would be exposed to enhanced noise pollution, and there would be severe environmental impacts – diverting five rivers, building a tunnel under the M25 and new flight paths would significantly impact wildlife throughout London, including the eleven bat species that reside within Richmond Park.

EGLL - Boeing 747 - British Airways - G-BNLY by Steve Lynes, via flickr. — EGLL – Boeing 747 – British Airways – G-BNLY by Steve Lynes, via flickr.

In its first year, Biodiversity Net Gain (BNG) has significantly underperformed. First-year figures for BNG show only 773 hectares of habitat creation and enhancement (onsite and offsite combined), which marks just 13% of Defra’s annual generation estimations for the scheme. This shortcoming is due to broad exemptions, limited resources and poor monitoring and enforcement. Environmental groups are calling for a strengthening of the scheme through the upcoming Planning and Infrastructure Bill , including more ambitious targets, reducing exemptions to BNG, enhanced monitoring and enforcement, and a guarantee that reforms will not weaken existing protections while delivering more effective off-site nature compensation.

Find an official response from CIEEM on the UK Government’s Planning Reform Working Paper here. The working paper will be used to build the Planning and Infrastructure Bill that will seek to fast-track development across the UK and could see impacts on the role and effectiveness of biodiversity net gain.

UK Moth Recorders’ Meeting 2025

Butterfly Conservation’s Moth Recorders Meeting provides an essential update for ecologists, wildlife watchers, and naturalists interested in the latest developments in moth recording, research, and conservation. Introduced by director of business and research, Russel Hobson, this year’s meeting was held online via Zoom on Saturday 25th January, and comprised of a variety of talks by keynote speakers including Dr Zoë Randle, David Hill and Dr Avalon Owens.

Dr Zoë Randle, Butterfly Conservation: National Moth Recording Scheme Update

The first speaker, Butterfly Conservation’s Dr Zoë Randle, shared an update on the National Moth Recording Scheme and key trends. Over 600,000 observations were submitted on iRecord throughout2024, bringing the total macro moth records to 36.2 million and micro moth records to 7.4 million in the National Moth Recording Scheme. Despite an increase in moth recording last year, Zoë emphasised the importance of both recorders and verifiers, while also stressing the need for more volunteers to streamline the verification process.

A map showing the density of records across the UK — Number of Records in the National Moth Recording Scheme per km square. Credit: Dr Zoë Randle

Dr Norman Lowe, County Moth Recorder, Breconshire: Charismatic Clearwings in mid-Wales.

Dr Norman Lowe, County Moth Recorder for Breconshire, discussed clearwings in mid-Wales, presenting the group as flagships for dayflying moths and provided an update on clearwing records during 2024. Last year, 31 more recorders and ten more pheromone traps/lures were supplied to aid in recording, resulting in a total of 80 clearwing observations for 2024. Data revealed some local and scarce species, including the Welsh Clearwing and Red-tipped Clearwings, and highlighted species which are common and widespread, like Lunar Hornet Moths.

David Hill, Conservation Manager (Scotland), Butterfly Conservation: Black, White, Red & Gold – surveying Argyll’s rare moths

Next to speak was David Hill, who reported on two key species that he has been working with in Scotland: White Spotted Sable Moths and Transparent Burnet. He discussed the background and biology of the species, as well as the efforts undertaken to better understand their pressures and distribution.

2024 larval surveys uncovered 30 White Spotted Sable caterpillars over three days and allowed surveyors to categorise habitat. This coming year, the team will look to rear caterpillars to confirm identification, start adult surveys and seek out sites where Anania terrealis, a commonly mistaken species, is present.
Transparent Burnets are a focus for Scottish conservation projects as part of the Species on the Edge programme. This rarely recorded species is one of concern due to loss of suitable habitat and work will continue throughout 2025 to establish the distribution and abundance of this moth across Argyll.

Transparent burnet moth — Transparent Burnet. Credit: David Hill

Dr Luke Evans, Butterfly Conservation: Can we measure the impact of insect change on bird and bat populations?

Dr Luke Evans discussed the DRUID project, which has operated since 2021 and aims to investigate the drivers and repercussions of UK insect decline. Evans discussed the impact of this catastrophic decline on species whose diets are adapted to insects, true correlation vs random correlation (the observation data conundrum) and the suggestive patterns of decline in birds as a result of this. The use of key data, including that in the National Moth Recording Scheme, demonstrates the importance of national monitoring data for evaluating insect abundance and the direct impacts of insect change.

Dr Sam Fabian, Imperial College London: Understanding why artificial lights trap flying insects using high-speed videography

The next presentation was delivered by Dr Sam Fabian, who explored the aggregation of insects around bright light sources, how artificial light can impact insect flight and the behavioural mechanisms behind it. Fabian suggests that circling behaviour around bright light sources is due to dorsal light response – a stabilising reflex where insects angle their body to orientate bright lights above them – which causes erratic flight paths around artificial light sources.

Circling behaviours around artificial light sources. Credit: Dr Sam Fabian

Dr Avalon Owens, Rowland Institute, Harvard University: Do sustainable lighting practices sustain moths?

Last to speak was Dr Avalon Owens, who concluded the session with an insightful discussion on the impacts of light pollution on moths. This growing threat is one of many that impacts global insect abundance and diversity, and can have a range of negative impacts on insect behaviour, including: fatal attraction, temporal and spatial disorientation and visual confusion. These can have catastrophic effects on insects internal body clock, navigation ability and recognition of resources. With light pollution levels growing and expanding exponentially, Dr Owens also outlined key routes to tackle the issue by creating sustainable lighting that is useful, targeted, controlled, low level and warm coloured.

Five lighting principles for responsible outdoor lighting and impacts of artificial light on insects. Credit: Dr Avalon Owens

This year’s Moth Recorders Meeting was a fascinating insight into the National Moth Recording Scheme, key trends and developments in moth ecology and conservation, and the threats to these undervalued insects. Find out more about Butterfly Conservation, their valuable work and ways to get involved on their website.

To hear more from this year’s speakers, a recording of 2025’s meeting can be found on the Butterfly Conservation YouTube channel.

National Nest Box Week 2025

Friday 14th February marks the start of National Nest Box Week. With widespread population declines due to habitat loss and urbanisation, National Nest Box Week presents us with the perfect opportunity to provide habitat for local birds, boosting breeding success and contributing to the enhancement of biodiversity in our green spaces.

Mid-February marks the start of the breeding season for many British bird species, with many beginning to actively seek new territory and suitable nesting sites. Nest Box Week is a great time to install a new nest box or do some maintenance on any existing boxes. By providing artificial nesting sites, we can assist species such as Robins, House Sparrows, and Swifts, while simultaneously raising public awareness about the diverse range of birds that benefit from these resources.

House Sparrow at the entrance of a nest box — Image by Vine House Farm via Flickr

Here are some ways to get involved in National Nest Box Week:

Install a nest box in an outside space, garden or balcony
Plant native flora and provide access to fresh, clean water to keep your garden bird-friendly
Support bird conservation organisations by donating, volunteering or sharing their work
Encourage friends and family to get involved in supporting their local wildlife

Garden Bird Species

Robins are a familiar sight in UK gardens and are easily recognised by their bright red breast and cheerful song. They prefer open-fronted nest boxes, often tucked away in hedges or shrubs, to mimic their natural nesting preferences in sheltered crevices and vegetation.

Blue tits are small, vibrant birds common across the UK that are often seen flitting through gardens and woodlands. They prefer small, enclosed nest boxes, hung high to mimic their natural nesting sites in tree cavities.

With their distinctive yellow beak and melodious song, Blackbirds are a common sight in various habitats across the UK. They prefer open-fronted nest boxes, at a slightly higher location, tucked away amongst dense vegetation or climbing plants for added security.

House Sparrow perched on balcony railing

Common in UK gardens and urban areas, Sparrows prefer nest boxes with a small entrance hole, placed high up on walls or under the eaves of houses, mimicking their natural nesting sites in crevices and holes in buildings.

Why is National Nest Box Week important?

Increasing urbanisation, human development and changing land-use have had devastating impacts on bird populations in the UK. A loss of natural nesting habitats has introduced extra challenges for rearing young, and nest boxes provide nesting birds with vital habitat to rear chicks – helping to mitigate the impacts of habitat loss which is essential for supporting local bird populations.

Find a selection of nest box blogs on the Conservation Hub, including:

NHBS Guide: Where to hang and how to maintain your nest box

Training Course: Bats for Building Professionals

The recent training course by the Bat Conservation Trust, Bats for Building Professionals, aimed to provide direction and understanding on the legal protections surrounding bats and their roosts in buildings. Suitable for contractors, pest controllers, surveyors, architects or those working within the construction industry, the session aided building professionals in developing their bat roost identification skills and taught them how to navigate situations where bats are present on site.

The seven-hour course, run over two interactive online sessions, explored bat ecology, biology, best practices, the latest guidance and legal information.

The course began with a comprehensive overview of Britain’s breeding bat species, covering their biology, ecology, adaptations, habitat preferences and roosting types. Speaker Katie Swift introduced the Bat Calendar – a particularly interesting aspect of the session which revealed how contractors and construction workers can plan work around bat activity to minimise disturbances (see below).

Bat calendar indicating best times for construction works — The bat calendar shows how contractors and construction workers can plan work around bat activity to minimise disturbances.

This led to a discussion of bat roosts in built structures, where Katie explained why bats favour these spaces and detailed attractive features for both cavity and crevice roosting species, such as soffits, eaves, and cladding. Exploring the different uses of these roosts throughout the year, Katie highlighted how occupied spaces change between summer and winter, and which bat species commonly utilise buildings for this purpose. Using examples like pipistrelles and horseshoe bats, she demonstrated how different species utilize roosting sites and how to recognize an active roost.

The second part of the discussion focused on legislation and bat protection, educating attendees on the laws that are in place to ensure bat protection, actions that are considered an offence, and highlighting advice services available. Katie then reviewed the European Protected Species License, explaining its role in safeguarding bats within the UK, outlining how construction activities can potentially harm bats in buildings, and when to seek advice as a building professional in keeping with best practice guidelines.

Common pipistrelle bat — Image by Bio Blitz via Flickr

The second session concluded with an interactive quiz of working examples for building professionals, covering a range of typical building works including barn conversions, door repairs and gutter replacements.

The ‘homework’ task between sessions was a particularly enjoyable aspect of the course – through independent field work, attendees had the opportunity to report on the potential bat features of their chosen building or structure and apply the knowledge learned throughout the session to understand which species may be present in the area, the areas bats may utilise on the structure and what works might impact a roost.

This insightful and informative training course provides a valuable resource for building professionals seeking to learn or refresh their knowledge about bats and building projects. The speaker’s expertise ensured a comprehensive and engaging learning experience, covering everything from bat ecology, to bats in buildings and licensing.

Find out more about upcoming events and the extensive range of training courses with the Bat Conservation Trust via their website.

Top 5: Thermal Scopes

Thermal scopes detect and display temperature variations and can use the infrared energy (heat) emitted by warm-blooded animals to create a distinct thermal profile. They produce an image that displays different temperatures in different colours which can be used to visibly detect the location of animals that may not otherwise be seen due to lack of light.

Thermal scopes are typically used to survey nocturnal or elusive species. Particularly useful when used in bat surveys, they can be used to identify roost access points with greater accuracy and can provide improved-quality images of animals in flight. Thermal scopes are also used in surveys for other wildlife, including bird ringing programmes and nest box monitoring, particularly for Pine Martens. This non-invasive technology allows ecologists to monitor wildlife whilst minimising disturbance, allowing for more accurate data reporting on wildlife behaviour. They can be used during both the day and night and offer different colour palettes to improve visibility in different environmental conditions.

Thermal scopes are designed with varied capabilities and are suitable for a range of users, from naturalists to ecologists. Here we explore a range of thermal scopes available on our website, including both affordable and more advanced options, and highlight the benefits and features of each.

Pulsar Telos XP50 Thermal Imaging Monocular

Featuring an industry-leading thermal sensor, this high performance monocular provides high resolution imagery in all conditions and has a built-in laser range finder (LRF) capable of long-distance measurements. Durable and user–friendly, these waterproof optics are suitable for all weather conditions and are designed with a wear-resistant rubberised body to maximise longevity.

Sensor: 640 × 480, 17µm, <18mK NETD
Lens: 50mm/F1.0 Germanium lens
Magnification: 2.5-10.0× (and 4× digital zoom)
Frame rate: 50Hz
Detection range: 1,800m
Video/photo resolution: 1024 × 768
Rating: IPX7
Operating time: Up to 8.5hrs
Weight: 720g with battery

Pixfra Sirius S650 Thermal Imaging Monocular

A compact, powerful monocular offering an incredible optical performance. This monocular has an impressive magnification and detection range, making it ideal for wildlife observation and recording thermal images at a distance. And with 64GB built-in storage, still images or video can be recorded at the push of a button.

Sensor: 640 × 512, 12µm, <18mK NETD
Lens: 50mm/F0.9
Magnification: 3.45 ×
Frame rate: 50Hz
Detection range: Up to 2,600m
Rating: IP67
Operating time: Up to 6 hours
Weight: 537g

Pixfra Arc 600 Series Thermal Imaging Monoculars

A great all-round choice at a competitive price point, this thermal monocular is compact, lightweight and has the widest field of view in the Pixfra range making it ideal for emergence surveys. A highly robust chassis and an IP67 rating mean that this monocular is incredibly durable and is built to withstand poor weather conditions, drops and scrapes in the field.

Sensor: 640 × 512, 12µm, NETD <30mK
Lens: 13mm/F1.0
Magnification: 0.875×
Frame rate: 50Hz
Detection range: 670m
Rating: IP67
Operating time: Up to 6.5h
Weight: 304g (excluding battery)

Pulsar Merger LRF XP50 Thermal Imaging Binoculars

High-spec, professional-level thermal binoculars, this device features a built-in laser range finder and a highly sensitive thermal sensor operating across a long detection range. Lightweight and durable, these advanced thermal optics are highly resistant to harsh environmental conditions and can be submerged in up to one meter of water for up to 30 minutes.

Sensor: 640 × 480, 17 µm, NETD <25mK
Lens: Fast aperture F50/1.0 germanium lens
Magnification: 2.5×-20× (and digital 8× zoom)
Frame rate: 50Hz
Detection range: 1,800m
Video/photo resolution: 1024p × 768p
Rating: IPX7
Operating time: Approx 10hrs
Weight: 800g

Pulsar Axion 2 XQ35 Pro Thermal Imaging Monocular

A lightweight and highly portable mid-range monocular, this thermal scope features an industry-leading sensor and a high-quality aperture objective lens to ensure clear, distinguished viewing. Innovative in design, this monocular allows for still image and video recording to internal memory, and is Wi-Fi enabled to allow for easy downloads to a mobile device.

Sensor: 384 × 288, 17 µm, NETD <25mK
Lens: Fast aperture Germanium 35mm/F1.0 objective lens
Magnification: 2-8×,
Detection range:1,300m @ 1.8m
Video/photo resolution: 528 x 400p
Rating: IPX7
Operating time: Up to 11 hours
Weight: 380g

Recommended Reading:

Thermal Imaging for Wildlife Applications

Paperback & Hardback | Oct 2023

A practical guide that collects findings from academic research and applied field protocols to inform readers on the fundamentals of the technology, its methods, equipment and applications.