Conservation

The NHBS Harp Trap: New Model Assembly Instructions

This blog provides a step-by-step guide on to how to set up and disassemble the latest model of the NHBS manufactured Harp Trap.

Please note that the NHBS Harp Trap is a made-to-order item, contact us at customer.services@nhbs.com for enquiries and we will be happy to advise on the current lead time.

Handling your trap

The trap carry bag has been designed to allow handling/carrying by either one or two people.

What’s in the bag?

1 × Harp Trap, 4 × legs, 2 × support poles (in two parts), 1 × accessories pack (including instructions, 4 × pegs, 4 × guy ropes and spare line)

Please follow these instructions for correct assembly and disassembly. We recommend that this is carried out by two people.

Setting Up

1 . Carefully remove the harp trap from its carry bag and place the frame upright on the floor.

2 . Take the legs out of the carry bag and insert them into the holes on the underside of the frame – it is easiest to do this one end at a time. When required, all legs can be individually adjusted to raise the trap or to level out when setting up on uneven ground.

3 . Undo the straps and allow the collecting bag to settle by opening the arms of the frame out fully. If using guy ropes, attach them to the upper carriage now.

4 . Release the spring locking pins at both ends of the trap by pulling the lever out and rotating 90° to lock in the open position. Grab the longer piece of the support poles and hold upright with the connector facing down. Now, loosen the star handled screw and carefully lift the top carriage, raising it away from the main frame. Insert the support pole through the hole, where you removed the upper carriage from, and allow the poles to sit on the floor. Then insert the top carriage locating pins into the open end of the support poles.

5 . If using guy ropes, untie and allow to hang.

6. Working at the same pace, slowly raise the support pole so that the bottom of the pole is just below the lower part of the main frame, watching closely to ensure no strings get tangled. Once you reach this height, tighten the star handled screw to secure the support pole in position.

7 . Take the shorter parts of the support poles and attach them to the bottom of the longer parts by screwing together.

8 . With the support poles now at their full length, while holding on to them, loosen the star handled screw and continue to raise them, still working together and checking for any string snagging. Raise until the bottom of the pole is level (or as near as possible) with the bottom of the frame and tighten star handled screws.

9 . Engage both spring locking pins to secure the lower carriage.

10 . If you are using them for stability, you can now peg out the guy ropes and your trap is ready for use.

Disassembly

1 . If used, pull out the pegs and store them carefully.

2 . Release the spring locking pins from both ends of the trap. Hold the support poles (one person at each end) and loosen the star handled screws to lower the poles.

3 . Continue to slowly lower the poles and as you do so, carefully start winding the bottom line carrier, taking great care to ensure no lines get tangled. Guiding the lines with your hand/arm is key. Keep lowering the support poles slowly and evenly while winding the line carrier until the support poles rest on the floor.

4 . With the support poles resting on the ground, tighten the star handled screw to hold the pole in position, unscrew the lower/short part of the support pole and safely place to one side.

5 . Hold onto the support pole, loosen the thumb screw, and continue to lower until the pole sits on the ground. If used, gather up the guy ropes, tie them up, detach from the frame and place safely to one side.

6 . Now lift the top carriage off from the top of the support pole, slide the pole out from the frame and place to one side. Continue to lower the top carriage, whilst winding the bottom carriage, until the top carriage sits on the main frame.

7 . Once the top carriage has been lowered fully, engage the spring locking pins and tighten the star handled screw to secure it in place, fold the arms of the catch bag assembly inwards until they meet, wrap the bag around the trap and tie the straps to secure.

8 . Remove the legs from the frame, working on one end of the frame at a time is easiest. If you have extended the legs, to aid storage, reduce them to their shortest length.

9 . Place the guy ropes and pegs back in the accessories bag. Put the legs and the support poles in the bottom of the carry bag and finally, carefully place the trap and accessories bag back into the carry bag, safe and sound, ready for next time.

Book Review: New World Monkeys

Currently in our Backlist Bargains sale!

RRP £42.00, now just £25.20

***** Comprehensive and incredibly accessible

When I recently reviewed The Real Planet of the Apes, I casually wrote how that book dealt with the evolution of Old Work monkeys and apes, ignoring New World monkeys which went off on their own evolutionary experiment in South America. But that did leave me wondering. Those New World monkeys, what did they get up to then? Here, primatologist Alfred L. Rosenberger provides a comprehensive and incredibly accessible book that showed these monkeys to be far more fascinating than I imagined.

Most people are probably not very familiar with these monkeys. Technically known as platyrrhines, they are predominantly arboreal (i.e. living in trees), small to medium-sized primates. You might know the insanely loud howler monkeys from nature documentaries. Perhaps you have heard of capuchin monkeys or spider monkeys. But you could be forgiven for not having heard of marmosets and tamarins, or the even more obscurely named titis, sakis, and uacaris. A total of 16 genera are recognized, but outside of the scientific literature and technical books, these monkeys are not all that well known. And that is a shame as, from an evolutionary perspective, this is a unique group.

Marmoset, Sagui gritando by Joao Guillherm Soares Dias, via flickr.

Now, before Rosenberger gets to this, it helps to better know these monkeys. Accompanied by many excellent illustrations and photos, the first half of New World Monkeys is dedicated to their ecology, behaviour, and morphology. Topics covered include their diet and dentition; locomotion and the anatomy of hands, feet, and prehensile tails; but also brain size and shape; and their social organization and ways of communicating via sight, sound, and smell.

The platyrrhines are a diverse bunch with some remarkable specialisations. In the family Cebidae we find the smallest members, some of whom, the Marmosets and Pygmy Marmosets, have teeth specialized for gouging the bark of gum trees and feeding on the gum that is released in response. In the family Pitheciidae we find the only nocturnal member, the Owl Monkeys, which have concomitant morphological adaptations such as enlarged eyes. In both this and the closely related Titi Monkeys, individuals have the adorable habit of twining their tails when socializing or sleeping. The family Atelidae is home to species with exceptionally prehensile tails whose underside ends in a pad with a fingertip-like surface. The Muriquis and the aptly-named Spider Monkeys use them as a fifth limb in locomotion, as demonstrated by a striking photo of a Black-faced Spider Monkey on plate 13. Here we also find the well-known Howler Monkeys, whose skull is heavily modified to support the exceptionally loud vocal organs in their throat and neck.

Black Howler Monkey Portrait #1 by Ryan Poplin, via flickr.

Despite these differences, platyrrhines are closely related and form what is called an adaptive radiation. Just like the textbook example of Darwin’s finches, many members have evolved unique adaptations and ways of living to minimise competition and maximise resource partitioning. Two ideas feature prominently in this book to explain how platyrrhines have evolved and what makes this adaptive radiation both so diverse and so interesting.

One idea is what Rosenberger calls the Ecophylogenetics Hypothesis. If I have understood him correctly, this combines information on a species’ ecology and phylogeny, its evolutionary relationships. It can offer hypotheses on how ecological interactions have evolved, but it also recognizes that ecological adaptations are shaped and constrained by evolutionary relatedness. For the platyrrhines, taxonomically related members are also ecologically similar. To quote Rosenberger: “[…] phylogenetic relatedness literally breeds resemblance in form, ecology, and behavior” (p. 96) and “Each of the major taxonomic groups that we define phylogenetically is also an ecological unit […]” (p. 97).

The other idea that makes the platyrrhines so interesting is dubbed the Long-Lineage Hypothesis. An extensive chapter on the fossil record documents how the whole radiation has been remarkably stable for at least 20 million years. Today’s New World monkeys are virtually unchanged from their ancestors, living the same lifestyles and occupying the same ecological niches. Some fossils have even been classified in the same genus as their living counterparts. This stands in sharp contrast to the evolutionary history of Old World monkeys where there has been a constant churn, whole groups of primates evolving and going extinct with time.

Red-backed Bearded Saki (Chiropotes sagulatus) by Allan Hopkins, via flickr.

What stands out, especially when Rosenberger starts talking taxonomy and evolution, is how well written and accessible the material here is. He takes his time to enlighten you on the history, utility, and inner workings of zoological nomenclature, making the observation that “names can reflect evolutionary hypotheses”. Here, finally, I read clear explanations of terms such as incertae sedis (of uncertain taxonomic placement), monotypic genera (a genus consisting of only a single species), or neotypes (a replacement type specimen). Similarly, there are carefully wrapped lessons on how science is done – on the distinction between scenarios and hypotheses, or how parsimony and explanatory efficiency are important when formulating hypotheses. Without ever losing academic rigour or intellectual depth, Rosenberger quietly proves himself to be a natural-born teacher and storyteller, seamlessly blending in the occasional amusing anecdote.

A final two short chapters conclude the book. One draws on the very interesting question of biogeography, i.e. on how platyrrhine ancestors ended up in South America, which was long an island continent. Rosenberger convincingly argues against the popular notion of monkeys crossing the Atlantic on rafts of vegetation* and in favour of more gradual overland dispersal. The other chapter highlights their conservation plight as much of their tropical forest habitat has been destroyed by humans.

With New World Monkeys, Rosenberger draws on his 50+ years of professional experience to authoritatively synthesize a large body of literature. As such, this book is invaluable to primatologists and evolutionary biologists and should be the first port of call for anyone wanting to find out more about the origins, evolution, and behaviour of these South and Central American primates.

* One mechanism that Rosenberger does not mention is that tsunamis could be behind transoceanic rafting, as argued in a recent Science paper. This looked at marine species in particular and I doubt it would make much of a difference for terrestrial species. Most of the objections Rosenberger gives would still apply.

New World Monkeys is available from our bookstore here.

NHBS In the Field – Song Meter Mini 2 and Micro 2

The second-generation Song Meter Mini 2 and Micro 2 are the latest additions to the Wildlife Acoustics acoustic recorder range, with the Song Meter Mini 2 available in both AA and Li-Ion powered versions.

I was eager to test the new Li-Ion version of the Song Meter Mini 2, which I set up alongside the Song Meter Micro 2 in early December. The aim of this deployment was to compare the performance of the two models, and as a self-described ‘bird nerd’, I was also very excited to capture recordings of the incredible birdlife that resides on Dartmoor.

Deployment

The Song Meter Mini 2 Li-Ion model holds six rechargeable 18650 lithium-ion batteries with a minimum of one required for deployment. In this case, I used four batteries in both devices which provided ample runtime for this short field test, and I inserted a 32GB SDHC card – unfortunately, I did not have access to a battery charger so the Song Meter Mini 2 began the deployment at 57% battery life. I set up the recorders in a rural Dartmoor village hoping for clear recordings.

Song Meter Mini 2 Li-Ion (right) and Song Meter Micro 2 (left) set up with batteries and SD cards. — Song Meter Mini 2 Li-Ion (left) and Song Meter Micro 2 (right) set up with batteries and SD cards.

One of the main strengths of Wildlife Acoustic’s recorders is their simple deployment and configuration using the free Song Meter app. Here you can select your preferred recording schedule and check the status of your recorder at any time while in Bluetooth range – this provides information on SDHC card capacity, battery life, recording mode, and number of recordings taken. For this deployment, I used a pre-set recording schedule to record birds for two hours around sunrise and sunset.

Song Meter Mini 2 Li-Ion (right) and Micro 2 (left) status before deployment. — Song Meter Mini 2 Li-Ion (left) and Micro 2 (right) status before deployment.

Both models now feature cable lock holes so that they can be safely secured during deployment – using a Python Lock, I fixed the device to a tree and left it to record for two days.

Results

Over 2 days, I had collected 33 recordings on each device. Both devices had ample battery life remaining and had used just 1.75GB of storage.

Song Meter Mini 2 Li-Ion (right) and Micro 2 (left) status after deployment. — Song Meter Mini 2 Li-Ion (left) and Micro 2 (right) status after deployment.

I analysed the recordings with a fantastic free desktop software called Chirpity. Using the BirdNET model, this software has an auto ID feature which simplifies analysis of sound recordings, particularly for large data sets. Using this software, I was able to identify a wide variety of garden bird calls including Robins, Blue Tits, Tawny Owls and many more. Examples of the dawn chorus from each device can be heard below.

Dawn chorus recording on Song Meter Mini 2 Li-Ion.

Dawn chorus recording on Song Meter Micro 2.

Spectrogram analysis of dawn chorus in Chirpity

Product Comparison

Both devices are impressive recorders in their own right – they produced clear and extensive recordings that captured a fantastic snapshot of the surrounding soundscape. On paper, the most obvious difference between these two recorders is the price, with the Micro 2 being much more affordable than the Mini 2-Li-Ion (@less than 1/3 of the price).

Furthermore, the Micro 2 is around half the size of the Mini 2-Li-Ion, its compact design is hard not to be impressed by, and it can fit easily into a pocket. Despite its small size, the Micro 2 features an incredible sample rate of 256kHz which allows you to capture good-quality high frequency recordings.

However, what you gain in compactness you lose in battery life. The Micro 2 has an estimated runtime of 280 hours compared to the Mini 2-Li-Ion which has a whopping 1,330-hour run time. The Micro 2 was deployed with a fully charged battery and finished with 76% battery life. Comparatively, the Mini 2-Li-Ion started and finished at 57%, an impressive feat.

Song Meter Mini 2 Li-Ion (right) and Micro 2 (left) — Song Meter Mini 2 Li-Ion (left) and Micro 2 (right)

Another key difference between these recorders lies within environmental noise. These devices were deployed in the run-up to Storm Darragh, and some of the recordings experienced a good deal of wind distortion. Although this is an extreme case, it served to highlight the difference a windshield makes. The Micro 2 has no windshield over the microphone and as a result, experienced markedly more distortion when compared to the shielded Mini 2-Li-Ion. This can be seen in the spectrograms below, which were taken simultaneously. The Mini 2-Li-Ion also has the advantage of a low-noise microphone which, to my ear, produces slightly clearer recordings compared to the Micro 2.

Song Meter Mini 2 Li-Ion (right) and Micro 2 (left) wind distortion — Song Meter Mini 2 Li-Ion (left) and Micro 2 (right) wind distortion

Comparison table of Song Meter Mini 2 Li-Ion (right) and Micro 2 (left) — Comparison table of Song Meter Mini 2 Li-Ion (left) and Micro 2 (right)

Summary

While both recorders allow you to experience the surrounding soundscape in new ways, they each offer distinct functionalities to achieve this goal.

The compact design of the Song Meter Micro 2, along with a recent price drop, makes this recorder a fantastic choice for enthusiasts who want to delve into bioacoustics. It has an excellent sample rate, good battery life and produces crisp recordings that are a joy to listen back to.

In comparison, the Song Meter Mini 2-Li-Ion is perfect for researchers. Its improved battery life makes it an excellent choice for both short and long-term deployments, and the low-noise microphone and windshield are ideal at producing clear recordings for subsequent analysis.

This Week in Biodiversity News – 3rd February

Pollution

Flea and tick treatments are contaminating songbird nests. A recent study surveyed 103 tit nests that utilised pet fur in construction, and found that 100% were contaminated with fipronil, a chemical component of pet flea and tick treatments that is banned for agricultural use in the UK and the EU. Contaminated nests were found to have an increased number of unhatched eggs and dead chicks, placing significant pressure on breeding bird populations. The findings have led to calls for a thorough environmental risk assessment of veterinary treatments, and to consider restricting their use as a preventative measure to an active treatment.

Great tit with nesting material — Image by hedera.baltica via Flickr

The Arctic carbon sink is now a source of emissions, a new study concludes. Rising temperatures in the Arctic landscape are facilitating the release of vast amounts of carbon dioxide, which is currently stored in the region’s permafrost, and over 40% of this is now significantly contributing to greenhouse gas emissions in the context of global warming. The effects of rising temperatures are also reflected by visual changes in the landscape – ground collapse, increased plant growth, microbial domination – and changes in the carbon cycle in the region.

Environment

Wales’ plan to reverse wildlife decline lacks plan, action and investment according to Senedd’s cross-party environment committee. A recent report identified several shortcomings that have impacted the Welsh government’s ability to tackle nature loss and boost biodiversity. These include legislation that failed to deliver, outdated key policy documents, a broken promise to update the Nature Recovery Action Plan, and a history of delays, undelivered commitments, and missed deadlines. With 1 in 6 species at risk of local extinction in Wales, and a 20% decrease in wildlife over the last three decades, the committee urged the Welsh government to prioritise setting targets to address biodiversity loss by 2030, bringing Wales in-line with previously agreed biodiversity commitments.

eurasian curlew — One in six Welsh species are threatened with local extinction. Image by Antje Schultner via Flickr

T he Office for Environmental Protection (OEP) has published a report on the prospect of the UK meeting its environmental targets and commitments. The third OEP assessment analysed the government’s current progress towards improving the country’s natural environment between April 2023 and March 2024, and determined that the UK remains off track in meeting legal commitments due to slow progress and a loss of momentum. Key issues identified were as follows: policy or regulatory frameworks are not adequately developed or delivered; actions do not address all major pressures; inadequate resource provision and a lack of urgency. To tackle this, the report concluded that the UK government should speed up, scale up, stack up and catch-up actions to make adequate progress.

Wildlife and Conservation

A Greater Mouse-eared Bat (Mytosis mytosis) has been discovered in Sussex. In mid-January 2025, a breeding female Greater Mouse-eared Bat was found hibernating in the South Downs National Park, marking the first identification of a new female since the 1980s. This species was declared extinct in the UK in 1992 following decades of species decline, however two male sightings, one in 2002 and one in 2023 suggested the potential for their return in the future. Conservationists have ringed the newly discovered female to allow for future identification, monitoring and research, with the hope of discovering an established breeding population in Britain.

Galicia’s shellfish stocks are declining at an alarming rate. Europe’s primary source of mussels, and the world’s second largest producer of shellfish, has seen a dramatic fall in cockles, clams and mussels. In 2023, cockles crop fell by as much as 80% and last year, mussel production was at its lowest for the last 25 years with some stocks falling by 90%. It is thought that the climate crisis and pollution from agriculture and local industry are at the root cause of this catastrophic decline, with increased rainfall reducing the salinity of the water and invasive species attracted to rising water temperatures.

Brown Trout survival is at serious risk as English rivers warm with climate change. A Government report suggests that these native fish are at risk of extinction in large parts of England within decades. The first national temperature projections by the Environment Agency forecast an unliveable environment at the height of summer by 2030. Brown Trout have a temperature threshold of around 12°C, above which there is a significant risk of egg mortality, small hatching sizes and development defects. For adult fish, this increased temperature could also amplify the impact of pollutants and an individual’s susceptibility to pathogens.

Conference: Rewilding Futures Shaping Tomorrow’s Wild 2025

Although the term was initially coined in the 1990s, ‘rewilding’ has come to dominate conservation thinking in the last fifteen years. This seemingly paradigmatic shift was consequent of a growing perception that a vision of planetary future should not merely appease a bare minimum criterion for ecological longevity. Instead, conservationists should envision an ecologically prosperous future that supersedes the conditions of the present or the recent past. Many of the initiatives enacted under the banner of ‘rewilding’ may be seen as the attempted actualisation of this vision.

Six years have passed since Citizen Zoo’s original Rewilding Symposium in 2019. This period has seen a rapid acceleration in the global recognition of rewilding alongside the now widespread presence of rewilding initiatives. The growth and support of the rewilding movement has coincided, of course, with the continued acceleration of global biodiversity loss and the increasingly unignorable impacts of anthropogenic climate change. The common philosophy across the sometimes-disparate presentations of participants was that the process of actively reinstating biodiversity is inextricably tied to the viability of our planetary future.

Rewilding Futures played host to a globally diverse set of speakers from organisations including Rewilding Chile; Rewilding Europe; Rewilding Britain; Gorongosa National Park (Mozambique), Blue Marine Foundation; The Wildlife Trusts and Rewilding Argentina.

This year, the University of Cambridge played host to the conference, bringing together leading voices to tackle pivotal issues in the field and discuss the future of rewilding in the coming decades. Key highlights for me were as follows:

Carnivore Reintroductions

Luigi Boitani asked, ‘What role for wolves in Europe?’ – a fascinating presentation which argued for the conservation status and continued legal protection of wolves across the continent. The recovery of the species has been successful across swathes of Europe, and this has raised questions of the potential down listing of the species. Most interestingly, the presentation pulled into question the oft perceived justification for wolf reintroduction – their capacity to create a trophic cascade of top-down ecological restoration. The speaker argued that this justification has been historically overstated in the same way that their potential to prey on livestock has been underplayed. For Boitani, we must acknowledge that our desire for the presence of wolves is based on our perception of the species’ intrinsic value and simultaneously the real concerns about livestock predation must be mitigated.

Adult Lynx — Image by Tambako the Jaguar via Flickr

A presentation from Scotland: The Big Picture provided a summary of their efforts in working towards a reintroduction of Eurasian Lynx in Scotland. Similarly to Boitani’s consideration of wolves in Europe, they also acknowledged that the carnivore’s potential to prey on livestock has been understated by previous groups who have lobbied for lynx reintroduction. Most importantly, Scotland: The Big Picture acknowledged the necessity of garnering support from stakeholders who may be impacted by the presence of lynx. The organisation’s more clearheaded approach to the possibility of lynx reintroduction in Scotland marked a stark contrast to the mysterious and illegal releases in the Cairngorms which preceded the conference.

Perhaps the most contentious presentation of the event came from the Colossal Foundation – a Texan initiative that claims they are enacting a process of Thylacine ‘de-extinction’. A mandated project will see the Tasmanian Tiger, extinct since 1936, re-animated and playing a significant role in future Tasmanian ecology. This, alongside their programme of Woolly Mammoth ‘de-extinction’, could be perceived as representing the boldest outreaches of the rewilding movement. Pragmatists within the conference raised concerns about the detrimental implications that this unprecedented project, the mandate of which transcends ordinary legal barriers to reintroduction, could have on Tasmanian ecology.

Land for rewilding: Legal mechanisms and Ownership

The Lifescape Project offered an analysis of the legal mechanisms used to secure land for long-term rewilding, such as conservation covenants in England and conservation burdens in Scotland. Their talk Using Novel Legal Mechanisms to Secure Land for Rewilding: Lessons from across UK and Europe outlined the ways in which various mechanisms allow or impede the long-term dedication of land for rewilding. Utilising cross comparison case studies from across Europe, this talk encouraged innovative and collaborative approaches to improving land use legislation.

Similarly, Ted Theisinger’s workshop To Own and Control: The Future of Land Governance Structures in Scotland and Beyond presented an interesting consideration of the future of conservation in Scotland. Scotland is one of the most depleted terrestrial landscapes and simultaneously has one of the most concentrated structures of land ownership in the world. Throughout the workshop, participants considered the ways in which existing legislative instruments define the parameters of conservation within the context of Scottish land ownership. The workshop oriented toward imagining a future where non-human voices were interwoven into considerations of what to do with our lands and seas.

Scotland is one of the most depleted terrestrial landscapes and simultaneously has one of the most concentrated structures of land ownership in the world. — Image by Nick Bramhall via Flickr

Peatland Restoration

Among the many intriguing discussions of individual sites where rewilding is enacted was Andrew Osborne’s historical ecology of Chat Moss, a 36km square area of lowland raised bog in Salford. The presentation traced the history of Chat Moss over the last 200 years, including industrial habitat destruction which resulted in a significant loss of flora and fauna in the area. The talk highlighted the work of restoration projects dating back to the 1980s, driven by the imperative to preserve carbon stored in the peat and encourage carbon sequestration. Consequentially, the last forty years have seen the translocations of many species into the area, including the recent reintroduction of the Large Heath Butterfly (Coenonympha tullia).

Marine Rewilding

Another highlight was the Blue Marine Foundation’s presentation Rewilding the Seas: A modern odyssey of hope and challenge. Charles Clover outlined the work of the Blue Marine Foundation and looked to answer the question: why rewild the sea, which in comparison to land, is seemingly already wild? The presentation argued that the principles of sea rewilding are essentially the same as that of land, to bring back lost and depleted species to our oceans and restore ecosystems that have been harmed by human activities?– simply by stepping back and letting nature repair the damage, or by reintroducing species/ restoring habitats.

lesser spotted dogfish — Image by Mark Fox via Flickr

Final Thoughts

While aspects of rewilding remain deeply contentious and there continues to be a vast diversity in perspectives of what rewilding should and could be, the most substantial thematic takeaway is that rewilding has galvanised people in a way that traditional conservation approaches have not.

In 2025, the impacts of anthropogenic climate change and unprecedented biodiversity loss are met with deterministically inactive governing bodies across the globe. In many ways things seem more hopeless than ever before, yet actors within the conservation field understand that without hope there can be no inspiration for change.

The revolutionary potential of the rewilding movement has come to represent the last beacon of hope for a viable future for people and nature – a possible catalyst for change.

Book Review: Metamorphosis

***** A delightful potpourri

Entomologist Erica McAlister, the Curator of Diptera at the Natural History Museum, London (NHM), has previously written two popular science books on flies, The Secret Life of Flies and The Inside Out of Flies. Her mission is to change your mind not just about flies, but, as Metamorphosis shows, about insects in general. In her third book with the NHM, she teams up with radio producer Adrian Washbourne with whom she worked on the 10-part BBC Radio 4 series Metamorphosis: How Insects Are Changing Our World that formed the basis for this book. A delightful potpourri of entomology, Metamorphosis is particularly strong on the science history front and further solidifies McAlister’s reputation as a science communicator par excellence.

Metamorphosis is the same size as the preceding two books on flies, a small 14 × 20 cm hardback that is illustrated throughout. Its ten chapters, clocking in at 20 pages or fewer, each focus on one particular group of insects that stand out for one reason or another. She examines the biomechanical and biochemical details that allow fleas to jump so far. She explains how Darwin predicted (correctly) the existence of a hawkmoth species with an exceptionally long tongue by examining an equally exceptional orchid. Plus, there is an engrossing chapter on blowflies and their role in forensic entomology, a topic I find particularly fascinating.

Author Erica McAlister. Credit: Channel 5

The flap text explicitly mentions the book will consider modern applications of entomology. Indeed, each chapter concludes with a brief section on current and expected future applications. There is unsurprisingly a fair amount of robotics here, with fleas and bees inspiring different kinds of miniature robots. The question of how beetles harvest water from coastal fog in the otherwise bone-dry Namib desert has inspired research on new water-repellent surface materials. Other research on moth tongues is informing the development of micro- and nanostraws that could one day result in safely reusable medical needles. Meanwhile, several start-ups are optimising rearing protocols for black soldier flies that could become the future of animal protein in our food. This would help recycle organic waste and eliminate the environmental impacts of livestock farming. However, it will require finding ways to overcome our disgust of insects and our reluctance to try new food.

The applications, however, come across as a sideshow. Instead, Metamorphosis excels in telling utterly fascinating chapters from the history of entomology. Drosophila (which are not true fruit flies but called vinegar flies) are a widely used model system in biological research. The famous Fly Lab of geneticist and embryologist Thomas Hunt Morgan (1866–1945) pioneered their use. The remarkable part is that he was sceptical of both Darwin’s and Mendel’s ideas and hoped to disprove them, but ended up doing the exact opposite, finding evidence of classic Mendelian inheritance patterns in certain mutant flies. Or, take the story of the remarkable Victorian entomologist Margaret Fountaine (1862–1940), who used the inheritance of an uncle to travel the world solo, amassed an enormous butterfly collection now housed at Norwich Castle Museum, and left a time capsule of twelve notebooks with instructions not to open these until 1978. McAlister & Washbourne also provide an extended backstory to African American entomologist and civil rights activist Charles Henry Turner (1867–1923) who Lars Chittka also featured in The Mind of a Bee. Turner was denied an academic position on grounds of his ethnicity yet staunchly laboured on and made pioneering observations on bee behaviour in particular. He was ahead of his time in refusing to see bees ‘as simple reflex machines driven by spontaneous reactions to environmental stimuli’ (p. 185).

Hummingbird Hawkmoth feeding on a flower — Research on moth tongues is informing the development of micro- and nanostraws. Image by Peter Stenzel via Flickr.

These and other people are vividly brought to life here. The only fly in the ointment is some errors in dates: apothecary James Petiver apparently lived from 1865 to 1718 (he was born somewhere between 1663 and 1665 according to a published chronology), Turner supposedly married his wife in 1896 even though she died in 1895 (they married in 1886), and Turner himself died in 1923 and two pages later in 1958 (the former is correct). Other than reiterating the importance of proofreading numbers, this minor complaint does not diminish the fact that the history-of-science component of Metamorphosis is utterly engrossing. Many of these stories are largely unknown to the general public, with only articles in specialist journals commemorating the achievements of these historical figures. There are several biographies in here waiting to be written and McAlister & Washbourne have the makings of a fine pair of science biographers.

Whether you enjoyed the BBC Radio 4 series when it aired, find yourself in the museum’s gift shop wondering whether this book is worthwhile, or nurture an interest in entomology or the history of science (or the intersection of the two), I warmly recommend this little book, especially given the reasonable cover price.

Metamorphosis is available from the NHBS online store.

This Week in Biodiversity News – 13th January

Wildlife

Water Vole populations are undergoing a national decline in the UK. A new report from the Wildlife Trusts, The National Water Vole Database Project Report, was released last month to document the findings of a nationwide investigation examining Water Vole distribution over the past ten years. Although the report documented a 39% decrease in the number of occupied areas across the UK, it also identified a further 11 new regional key areas of increasing local populations, including several in East Anglia and Yorkshire. The report reveals a bleak national picture with declines across the country due to habitat loss and deterioration, but shows that in the right conditions, and with the help of conservation practitioners, it is possible to reverse their historic decline.

Bumblebee on a lavender flower — Image by Indy via Flickr

Conservationists have observed active worker bumblebees nest-building in Scotland during the winter months. Unusually mild weather during the Christmas period has led to early awakening from hibernation, and at least two species have started to build new nests early in the winter season. However, the subsequent return of cold weather and the scarcity of winter food sources pose a significant threat to these early nests, risking their collapse. In this instance, fewer queens would be available to build nests in the spring and could contribute to the national decline of bumblebees.

The National Trust has announced plans to create 250,000 hectares of biodiverse landscape. Equivalent to 1.5 times the size of Greater London, these nature-rich landscapes across England, Wales and Northern Ireland will address a current national need and are estimated to provide habitat for 1 billion earthworms. Labelled audacious yet achievable, this goal will be actioned on Trust properties, but also in partnership with other organisations, farmers and communities, to create larger tracts of landscape to tackle the climate and nature crises.

Male Lynx in the snow — Image by Tambako the Jaguar via Flickr

Last week, Lynx were reported in the Cairngorms National Park. A total of four animals were illegally released and subsequently captured by the Royal Zoological Society of Scotland (RSS), where they were taken to be quarantined at Highland Wildlife Park (later one sadly died). The source of these animals remains unknown, but experts have raised concerns about the nature of their release – these animals were released in sub-zero temperatures within areas of logging activity, which has been deemed a highly irresponsible action that has drawn criticism from conservationists.

Climate Crisis

2024 marks the first calendar year to surpass the 1.5°C warming limit. Now thought to be the world’s hottest year on record, 2024 has brought the world closer to breaking the international warming target of 1.5°C – although this target is based on long-term temperature averages, last year’s trends signify an upturn in global temperature, with the last decade being the warmest on record. Predominantly due to harmful greenhouse gas emissions, which are still at record highs, this record is met with calls for cuts in emissions over this calendar year.

Wind turbines at sunset — Image by Michael Mueller via Flickr

The UK generated its cleanest electricity ever in 2024, with 58% from low-carbon sources. The amount of electricity generated from fossil fuels has halved in the past decade, with the UK having seen an upturn in the use of renewable energy sources. In the past twelve months, renewables have generated 45% of the UK’s power, and when including nuclear sources, this number totals to 58%. Despite this, fossil fuels are still generating approximately 29% of electricity in the UK, and in order to meet climate and emission targets experts are urging for an accelerated phase out.

Finance

In a ‘landmark’ deal, the world’s first private sector loan based on biodiversity net gain unit models has been granted. Triodos Bank UK has loaned £3.85m to environmental consultancy Nature Impact – the money will be used to purchase a total of 122 acres over two sites, unlocking degraded farmland for biodiversity net gain. These degraded sites will undergo restoration and habitat creation, including native wildflower meadows and wetlands, to enhance their support of British wildlife and climate goals.

Habitat restoration site with wildflowers — Image by Robert Miller via Flickr

Ecologists at Oxford University have designed a new framework to classify how a unit of nature is defined for biodiversity credits. In the review, researchers acknowledge the lack of clarity on how one unit of nature is defined, or how measurements are standardised, and demonstrated the challenges involved with the biodiversity credit market. It presents a framework exploring how biodiversity is quantified, how positive outcomes are detected and how the number of credits can be adjusted to account for uncertainties. The authors caution against biodiversity credits to offset negative impacts, and instead direct focus on avoiding and reducing these factors.

This Week in Biodiversity News – 30th December

Conservation

Tasmania’s farmers are helping to conserve native grassland. These critically endangered habitats have undergone widespread deterioration due to historical agricultural practices, and remaining patches are degraded and fragmented throughout the state. An innovative partnership between landowners, the Tasmanian Conservancy and Bush Heritage Australia – the Midlands Conservation Partnership (MCP) – was formed to conserve and protect native grassland on private property through empowering farmers to manage their land sustainably.

Tiger in Jacksonville Zoo — Image by Caitlin Regan via Flickr

A growing number of zoos across the globe are reporting animal death by avian influenza. The virus appears to be spreading throughout captive animal collections, which could have grave, and potentially fatal, consequences for endangered species – already, zoos have reported deaths of a number of threatened species, including lions, tigers and panthers. It is thought to have been spread through infected wild birds landing in open air enclosures, and experts emphasise the need for enhanced biosecurity, or vaccination, to ensure the safety of captive animals.

A leading wildlife expert is calling for the legalisation of rhino horn trade. Martin Wikelski wrote to the journal Science, urging authorities to take the market out of criminal hands, in order to establish carefully monitored, legal transactions and regain control of the market. Wikelski argues that monitored trade could help to raise money for increased protective measures and save the last remaining populations, since crime syndicates have overcome every countermeasure that has been implemented to protect rhinos thus far.

White rhino in South Africa — Image by Ian Turk via Flickr

Discoveries

Twenty-seven species new to science have been discovered in a survey in Peru. A 38-day survey in Alto Mayo, a well-populated region in north-west Peru, has uncovered over 2,000 species of wildlife and plants, including new, rare and threatened species. Of these species previously unknown to science, there are four mammals, an arboreal salamander, seven species of new fish, a frog, ten butterflies and two dung beetles – and a further 48 species are awaiting verification before confirming their discovery. Alongside these exciting new discoveries, the expedition identified 49 threatened species from the IUCN Red List, including birds, amphibians and primates, and it is hoped that these discoveries will bolster conservation work in the region.

A recent study has discovered that right whales may live almost twice as long as previously thought. Four decades of photo identification data was used to analyse the life expectancy of Northern Atlantic Right Whales and Southern Right Whales. Researchers observed a life expectancy of up to 150 years for Southern Right Whales, and a contrasting 22-year average for North Atlantic Right Whales – primarily due to anthropogenic impacts, including entanglement in fishing gear, ship collisions or starvation which could be linked to environmental change. Authors plan to expand the scope of the study to examine other whale populations, in order to learn more about how whaling practices have impacted the abundance of older individuals and allow for estimates of recovery to pre-whaling population sizes.

Wildlife

Data shows that almost three quarters of the UK’s Sites of Special Scientific Interest (SSSI’s) have had no assessment of their condition since the start of 2019. These sites consist of ecologically valuable habitats, wildlife and natural features, and are legally protected to prevent environmental degradation. In the last assessment, nearly 40% of features were in unfavourable condition, and without further monitoring, conservationists warn that British wildlife could be disappearing unnoticed. In response, a long-term programme is being developed by Natural England to determine SSSI assessment, as well as making improvements to monitoring and data use.

a clutch of bird eggs in a nest — Image by Lisa Risager via Flickr

Over 6,000 wild bird eggs have been seized in the UK. In the largest haul of it’s kind, raids from Scotland, South Yorkshire, Essex, Wales and Gloucester uncovered thousands of wild bird eggs in attics, offices and drawers. The raids took place under Operation Pulka – an international effort tackling wildlife crime, especially the trading of bird eggs. Harvesting by egg collectors is placing additional pressures on already threatened and rare wildlife, and for species with a limited geographic range, could be the difference between existence and extinction.

This Week in Biodiversity News – 16th December

Environment

An area larger than India has permanently degraded into arid conditions, research shows. Studies by the UN Science Policy Interface have reported that up to three quarters of the world’s land has experienced likely irreversible drying in the past thirty years and now, arid drylands make up 40% of land on earth. Driven by climate change, poor farming practices, excessive water extraction and many other factors, this drying could see significant decreases in crop yield, GDP, and a reduction in the capacity of the land to store water.

viviparous lizard — Image by David Evans via Flickr

A two-year restoration project in Avon Heath Country Park will help to restore a rare habitat. Funded by Defra, £1.2 million will be used to restore this Site of Special Scientific Interest (SSSI) that is home to 2.5% of the world’s remaining lowland heathland. The 210-hectare site provides key habitat for all of Britain’s native reptiles, including Smooth Snakes and ground-nesting birds such as Woodlarks and Nightjars. Restoration work will involve the removal of invasive rhododendron, scrub and pine trees to rejuvenate the heathland and increase the availability of light for low-lying plants.

Conservation

A recent survey has shown that Grey Squirrels are invading Red Squirrel strongholds. Conducted by Red Squirrels Northern England (RSNE), the survey assessed 246 sites for an annual squirrel check. The survey found a rising presence of Grey Squirrels in Red Squirrel strongholds, a trend described as ‘concerning’ by RSNE project officers. These invasive, non-native species were found in 69% of surveyed sites, a 6.8% increase from last year and are now outnumbering Red Squirrels in Cumbria and Northumberland. However, RSNE successfully recorded a 2% increase of Red Squirrels in survey sites, up from 50% in 2023.

Cutting-edge technology is being used to inform forestry management in the UK. Forestry England is employing bioacoustic technology, environmental DNA (eDNA) and drones to inform conservation efforts across multiple sites. EDNA gathered from soil, air and water is being used to build a better picture of community composition across 21 forestry sites, and after four months of sampling, 5,000 unique fungal species and 1,000 invertebrate species have been identified. Bioacoustic data is also being gathered across four areas in Somerset, Dorset, Northumberland and North Yorkshire and will be used to track bumblebee activity through analysis of flight sound. This detailed data will be used to form a new biodiversity baseline to monitor the effectiveness of conservation efforts in the midst of biodiversity decline and climate change.

A light brown rodent is sat on a river bank underneath grasses, it has small black eyes and a small brown nose — Image by Peter Trimming via Flickr

A reintroduction project has seen the return of Water Voles along the Severn shoreline, levels and moors of North Somerset and South Gloucestershire. Led by the West of England Nature Partnership (WENP) in collaboration with Bristol Zoological Society, the programme is seeking to restore intertidal habitats, wetlands and peatlands, and part of this will be actioned through re-establishing Water Voles in the area. Avon Wildlife Trust have observed evidence that these animals have returned to the area, contributing to the region’s Local Nature Recovery Strategy.

Policy

Angela Rayner has been met with criticism following an interview discussing Labour’s housing pledge. With plans to build 1.5 million homes and fast-track over 150 major infrastructure projects, wildlife protection may take a back seat. Rayner expressed concern for those who desperately need housing, stating that providing homes in the UK should not be sacrificed for wildlife protection. Despite critics deeming the targets ‘unrealistic’, Rayner assured that compliance with national building plans would be mandatory under Labour’s National Planning Policy Framework.

Great crested newt in a hand — Image by Chris H via Flickr

Vital scrubland habitats are at risk following Labour’s announcement to build on grey belt land. Prime Minister, Sir Keir Starmer, has pledged to build 1.5 million homes on redefined green belt land, known as grey belt land. With what some call a ‘vague definition’ of grey belt land, swathes of countryside could be sacrificed for housing developments, in areas that could have been transformed to woodland or wetland habitats. This traditional landscape is vital for wildlife, including birds, reptiles and amphibians, and could prove essential in meeting 30×30 targets.

Interview with Charlotte Mead: The Wildwood Trust

The Wildwood Trust was established in 2002 and is one of the UK’s leading conservation and rewilding trust. The charity aims to push the boundaries of conservation by working alongside nature to fight the biodiversity crisis and halt species extinction using nature-based solutions. Alongside their conservation projects, volunteering opportunities and memberships, they also offer a host of educational courses and workshops across both of their sites.

Wildwood Devon is home to numerous native bat species, and over the last two years, they have been working alongside Devon Bat Conservation and Research Group to create, assist and monitor secure bat roosting sites for the breeding season to support endangered bat populations. In mid-2023, NHBS donated 10 general-purpose bat boxes to support this project. A year later, we had the opportunity to talk to The Wildwood Trust about the results from their first annual species survey on this site, how our donation has aided the project’s success, discuss their goals for the next five years and more.

Firstly, can you tell us about The Wildwood Trust and how the charity began?

Established in 2002, The Wildwood Trust is a native species conservation charity formed to push the boundaries of innovative conservation and rewilding. The charity began after it was decided that a small zoo could be instrumental in educating Kent locals about British wildlife – the zoo was subsequently renamed Wildwood Discovery Park and soon became The Wildwood Trust. Since then, the park has grown and changed, and the Trust has taken on a second site on the Escot Estate in Devon. We recently rebranded and the sites are now known as Wildwood Kent and Wildwood Devon, both working under The Wildwood Trust.

We work with nature to fight the biodiversity crisis, to halt the extinction of species and to create resilient habitats in which nature thrives. Wildwood’s experience and expertise in working with native species means we can work effectively across the UK in many projects, focussing on nature-based solutions to reinstate native species populations and recreate truly wild spaces.

Rewilding, through the reintroduction of keystone species, is the most powerful tool we have. These reintroduced animals alter their landscape by creating the space and complexity for hundreds of other species to thrive.

Which species are you hoping to encourage to the area with the installation of our bat boxes?

We have a number of resident species on site, including Brown Long-eared Bat (Plecotus auritus), Common Pipistrelle (Pipistrellus pipistrellus), Daubenton’s Bat (Myotis daubentonii), Noctule (Nyctalus noctula), Soprano Pipistrelle (Pipistrellus pygmaeus) and Whiskered Bat (Myotis mystacinus). With the addition of the Schwegler 2F Bat Boxes supplied by NHBS, we are hoping to attract a wider range of species, including Barbastelle (Barbastella barbastellus) and Nathusius’ Pipistrelle (Pipistrellus nathusii).

We have since completed our first bat box check and are pleased to see that our resident bats have taken to the boxes, and we have found pipistrelle droppings in multiple boxes. We were also lucky enough to find a female Common Pipistrelle in one of the boxes.

Breeding projects are a key element of the work you do. Why are these programmes so important and do you have a favourite success story that you can share with us?

Breeding projects are incredibly useful for a number of reasons, from maintaining genetic diversity within the population all the way through to providing an alternative to translocations. We work with a number of organisations and charities, who are also involved in captive breeding groups, to maintain high standards of husbandry and welfare to provide a healthy, genetically diverse captive population that can assist in future conservation projects.

I couldn’t possibly choose a favourite as Wildwood has bred and reintroduced many species, including Water Voles as part of development mitigation work and Hazel Dormice into suitable areas of former range. However, the memorable reintroduction of Red Squirrels to Anglesey was a successful project and re-established an iconic species after significant declines following the introduction of Grey Squirrels. We have also joined forces with other major captive breeding collections to implement a national captive breeding group which can assist in any future conservation projects.

How is Wildwood working to combat the effects of climate change?

Many of our rewilding projects aim to facilitate the restoration of native habitats, often through reinstating lost species. A good example of this would be our flagship wilding project ‘Blean Bison’ in Canterbury. Launched in 2019 with Kent Wildlife Trust, the project looked to promote stronger habitats by restoring natural processes and aimed to bring transformational change through a controlled trial with European Bison. To combat climate change, the project is aiming to restore 600 hectares of ancient woodland, a vital natural carbon store that can hold around 30% of the world’s carbon.

What does the Wildwood Trust hope to achieve in the next five years?

Wildwood will continue to be a leader in the field of native species conservation. We will continue to deliver our mission to protect, conserve and rewild British wildlife by building long-term and sustainable partnerships with like-minded organisations. Through collaborative working, we can maximise our impact and bring resilience to our native ecosystems.

Are there any other conservation projects that you’re working on that you can tell us about?

We are proud to be a collaborative organisation and, with like-minded conservation partners, we are now working towards the conservation and reintroduction of several species across Britain, including wildcats, Red-billed Chough and White-clawed Crayfish to name a few.

Part of the national captive breeding programme, the wildcats at Wildwood are involved in the creation of a genetically viable captive population. Our wildcat breeding programme has been hugely successful and in 2020 we announced our collaborative work to restore the European Wildcat to Britain.
As a keystone species, the conservation of White-clawed Crayfish is important for several reasons. The only native crayfish species found in the UK, these crustaceans play a key role in the food chain and are an important indicator species for freshwater health. White-clawed Crayfish are threatened by invasive Signal Crayfish, so our work to support the breeding of these animals through establishing a Devon crayfish hatchery is important in ensuring their survival.
For over 200 years the Red-billed Chough has been missing from Kent, so we have partnered with Kent Wildlife Trust to reintroduce these birds to the cliffs of Dover. The project has now reached its second year of reintroductions, and there are now 19 birds established in the area.

We are always looking for more projects to get involved with so please do get in touch if you think we can help!