Review – Page 3 – Hoopoe

Book review: The Rise and Reign of the Mammals

***** Epic in scope and majestic in execution
Leon Vlieger, NHBS Catalogue Editor

Imagine being a successful dinosaur palaeontologist and landing a professorship before you are 40, authoring a leading dinosaur textbook and a New York Times bestseller on dinosaurs. Imagine achieving all that and then saying: “You know what really floats my boat? Mammals.” After the runaway success of his 2018 book The Rise and Fall of the Dinosaurs, palaeontologist Stephen Brusatte shifted his attention and now presents you with the follow-up, The Rise and Reign of the Mammals. Taking in the full sweep of mammal evolution from the late Carboniferous to today, this book is as epic in scope as it is majestic in execution.

Mammals shared our planet with the dinosaurs throughout their long reign, from the initial split of our amniote common ancestor into synapsids (us) and diapsids (them), to their extinction at the end of the Cretaceous. Over the course of some 100 million years, a parade of lineages evolved—archaic mammals all—piecemeal developing the traits we recognise as mammalian today: pelycosaurs, therapsids, cynodonts, mammaliaformes, docodonts and gliding haramiyidans, multituberculates, and therians who gave rise to today’s placentals, marsupials, and monotremes. However, the above must not be mistaken for a linear march of progress. “[M]ammals were a still unrealised concept, which evolution had yet to assemble” (p. 20). Simultaneously, it does not behove us to call these now-extinct groups evolutionary dead ends. “In their time and place, these mammals were anything but obsolete” (p. 88).

With the extinction of the dinosaurs, the rise of mammals turned into a reign. Isolated on various land masses after the supercontinent Pangaea had fragmented, they were poised for a slow-motion taxonomic starburst that would play out over the next 66 million years. In the northern hemisphere, placental mammals replaced multituberculates and metatherians and rapidly evolved into primates and the odd- and even-toed ungulates. The latter two evolved giants: brontotheres, chalicotheres, and cetaceans.

Brusatte’s strength is to bring to life the above flurry of names. What kind of creatures were they? And how can we deduce this from fossil evidence? Somewhere between chapters 6 and 7, I became awestruck by his narrative as the enormity of the mammalian evolutionary trajectory started to come into full view: bats, elephants, South American native ungulates (origins: uncertain), metatherians migrating to Australia and spawning a spectacular marsupial radiation, grazers diversified as grasses went global, and somewhere at the end, hominins evolving and repeatedly spilling out of Africa, contributing significantly to recent megafauna extinction. What a wild ride!

The macroevolutionary story is fascinating in itself, yet Brusatte makes it even better with some interesting observations of his own. We usually think of the dinosaurs as dominating the mammals, but, he suggests, this went two ways: “While it is true that dinosaurs kept mammals from getting big, mammals did the opposite, which was equally impressive: they kept dinosaurs from becoming small” (p. 95). Furthermore, DNA studies suggest that many modern mammal lineages originated back in the Cretaceous. But where are the fossils? Could some of the poorly understood archaic placentals such as condylarchs, taeniodonts, and pantodonts be the missing fossils that we have not yet been able to link to modern groups because of the lack of signature anatomical features? Excitingly, Brusatte is part of a research consortium that is building a master family tree based on both anatomy and DNA.

As in his last book, Brusatte excels at explaining complex research methods and scientific concepts. One example is Tom Kemp’s concept of correlated progression. Several times during early mammal evolution, a whole suite of anatomical, behavioural, and functional traits were changing together, making it hard to unravel what was driving what. For instance when cynodonts shrunk in size and changed their growth, metabolism, diet, and feeding styles. Then there is the revision of the mammal family tree based on DNA sequencing. The classic tree, championed by zoologist George Gaylord Simpson in 1945, was based on anatomical features. By the early 2000s, DNA-based genealogies suggested that many supposed relationships were actually cases of convergent evolution, resulting in a new classification that reflected geographical patterns rather than anatomy. The new groupings came with some tongue-twisting names: Afrotheria, Xenarthra, Laurasiatheria, and Eurarchontoglires. A final example is tooth morphology, an important diagnostic trait in this story.

What helps with these explanations are some excellent illustrations. B/w photos show amazing fossils, Todd Marshall contributes both decorative chapter headings and explanatory artwork, and Brusatte’s former student Sarah Shelley adds b/w diagrams, illustrating for instance the remarkable changes in jaw bones and how some of these were repurposed to become our inner ear bones! Woven throughout are stories of the people behind the research. Brusatte introduces both young scientists and many past scientists that are not widely known.

In what is surely a hallmark of his love and enthusiasm for the field, Brusatte’s bibliography has again been written as a narrative. It is like a chatty literature review in which he recommends books and papers, indicates where literature has become outdated, adds more technical details or clarifications, discusses where there is active debate and disagreement, and shortly touches on topics that he had to omit from the main narrative. Yes, this takes up more space than a regular reference section, and I am sure it is more time-consuming to write, but it is ever so useful. You could not wish for a better starting point if you wanted to read deeper into the technical literature.

Finally, you might be left wondering how this book compares to Elsa Panciroli’s Beasts Before Us which covered early mammal evolution up to the K–Pg extinction. There is overlap here in more than one way; Brusatte co-supervised her PhD project describing the docodont Borealestes from a Scottish fossil. I was therefore mildly surprised that he does not mention her book. There is some inevitable overlap as both books walk through the same groups, though Brusatte provides a fuller picture by covering mammal evolution up to today. Panciroli’s book stands out for its fantastic writing, though, so you cannot go wrong by reading them both.

The Rise and Reign of the Mammals is a more-than-worthy successor to The Rise and Fall of the Dinosaurs. Brusatte convincingly shows that the evolutionary story of mammals is just as fascinating—if not more so—as that of the dinosaurs.

Book review: What an Owl Knows

***** A hoot of a book
Leon Vlieger, NHBS Catalogue Editor

Owls are one of the most enigmatic groups of raptors, in part because there is so much we still do not understand about them compared to other birds. Nature writer Jennifer Ackerman previously wrote the critically acclaimed The Genius of Birds. In What an Owl Knows, she reveals the creature that hides under that puffy exterior, peeling back the feathers layer by layer to show our current scientific understanding of owls. She has interviewed scores of scientists and owl aficionados as part of her background research, making this as much a book about owls as about the people who study and love them. A captivating and in places touching science narrative, this book is a hoot from beginning to end.

Owls are everywhere in the human imagination and, Ackerman argues, have always been: “We evolved in their presence; lived for tens of thousands of years elbow to wing in the same woods, open lands, caves, and rock shelters; came into our own self-awareness surrounded by them; and wove them into our stories and art” (p. 235). For all that, their nocturnal lifestyle makes them hard to study and they have long been—and in many places still are—wrapped in superstition. Ackerman dedicates a chapter to such beliefs and the harms that frequently flow from them. Fortunately, the tide is turning. Thanks to the tireless efforts of a dedicated cadre of scientists, conservationists, and numerous volunteers, a far more fascinating creature emerges from the contradictory tangle of ideas that humans have held about owls.

A red thread that has been subtly woven through this book is the importance of understanding animals on their terms. Ed Yong’s An Immense World is one recent example of this welcome trend amongst science writers and Ackerman appropriately starts with a chapter on owl sensory biology. What is it like to be an owl? Though this question can never be fully answered, that should not stop us from trying our hardest. Vision and hearing are obviously important to owls but the book has plenty of surprises up its sleeve once you start digging into the details: from the magnificent facial disk that acts somewhat like a parabolic reflector to gather sound, a hearing system that does not seem to age, to the fact that owls can see ultraviolet light. At night. With rod rather than cone cells (like pretty much every other bird).

The same question motivates research on owl vocalisations as “a hoot is not just a hoot” (p. 81). Owls utter a profusion of yaps, squawks and warbles and Ackerman paints a lively portrait in words. Barn owls have “a raspy hiss that sounds like a fan belt going out on your car” (p. 82), while the tiny Flammulated Owl breaks the link between body size and vocal pitch, sounding like “a big bird trapped in a small body” (p. 82, quoting ornithologist Brian Linkhart). These sounds can reveal an awful lot about the individual owl and its relationship with other owls in the landscape. Ackerman criticises some of the research on owl intelligence. They cannot pass the string-pulling test, a common test in ethological research in which an animal has to pull on a rope to reel in food that is out of reach. The idea is that it tests an animal’s understanding of cause and effect. But is this a fair test or does it “point to the limitations of our definitions and measures of intelligence” (p. 261)?

The most intimate insights have come from rescued owls that can no longer be returned to the wild. Many researchers have ended up caring for an individual and becoming intimately familiar with them. Gail Buhl, a leading authority on training rehabilitated captive owls, here explains five important things that she has learned. One particularly poignant observation is that owls might appear calm and stoic around humans, but having paid close attention to their body language, Buhl concludes that “they’re experiencing the same stress as other raptors, but they’re internalising it” (p. 228). This has major consequences for how even well-intended trainers and rehabbers ought to behave around owls. “We need to treat them not as mini-humans in feathers, but as their own entity” (p. 231), Ackerman writes, before throwing in a beautiful quote from naturalist Henry Beston. In his words, wild animals “are not brethren, they are not underlings; they are other nations, caught with ourselves in the net of life and time” (pp. 231–232).

Following on directly from her last book on bird behaviour, there are fascinating chapters here on the behaviour of owls: their courtship and breeding, their parental behaviour, their roosting, and their migration. Yes, many owls are migratory and some species can cover surprising distances. Ackerman makes a fantastic case for the value of long-term monitoring programmes to establish reliable population estimates. This is vital data for conservation efforts and is often missing. And sometimes what we think we know is wrong, as in the case of the Snowy Owl. Where initial estimates put the global population at some 200,000 birds, satellite tracking has revealed that they are actually a single population moving around the whole Arctic Circle, resulting in duplicate counts. Revised estimates now put the figure at a mere 30,000 birds.

Ackerman relies on the input of numerous scientists and volunteers. As such, this is as much a book about the people who study owls. I was delighted to hear more from Jonathan Slaght (his book Owls of the Eastern Ice is magnificent). Other stories tug on the heartstrings and none more so than that of Marjon Savelsberg. A Dutch musician trained in baroque music, her dreams came crashing down when she was diagnosed with a heart condition that consigned her to a mobility scooter. When she stumbled on the website of the Dutch Little Owl Working Group, she quickly became one of their most active volunteers, revealing a skilled ear for analysing owl calls. Suddenly, she had a new career and a new group of appreciative ecologist colleagues: “[I] realised I was still a musician. All the skills that I learned, all the talent I have, I can still use, just in a different way” (p. 105). It is a powerful story of redemption-by-owl.

Ackerman carefully balances these two facets: the scientific insights that she has carefully distilled from research papers and interviews, and the personal stories of those who study and love owls. As a result, What an Owl Knows is compulsively readable and readily accessible for those who lack a scientific background in ornithology.

You might also be interested in reading our Q&A with Jennifer Ackerman in which we discuss owls’ reputation for wisdom, the incredible research that is shedding more light on their lives, and the mysteries that still remain.

Book review: Otherlands

***** A spine-tingling debut
Leon Vlieger, NHBS Catalogue Editor

Our planet has been many different worlds over its 4.5-billion-year history. Imagining what they were like is hard – with our limited lifespan, deep time eludes us by its very nature. Otherlands, the debut of Scottish palaeontologist Thomas Halliday, presents you with a series of past worlds. Though this is a non-fiction book thoroughly grounded in fact, it is the quality of the narrative that stands out. Beyond imaginative metaphors to describe extinct lifeforms, some of his reflections on deep time, taxonomy, and evolution are simply spine-tingling.

The 16 chapters in Otherlands, each accompanied by a gorgeous illustration from Beth Zaiken, step back in time by millions or even tens of millions of years to visit a place on Earth and describe its ecosystems and organisms. Halliday includes well-known sites such as end-Cretaceous Hell Creek (66 million years ago, or mya) or Lagerstätten such as the Cambrian Chengjiang biota in China (520 mya). Far more interesting are the little-known eras and places such as the Italian promontory of Gargano during the Miocene Messinian Salinity Crisis (5.3 mya), the sweltering warmth of Seymour Island in Antarctica during the Palaeocene-Eocene Thermal Maximum (41 mya), or the underwater life around the Silurian Yaman-Kasy vent in Russia (435 mya).

Stylistically, Otherlands is a narrative non-fiction book. What that means is that, though everything is grounded in fact, Halliday does not get lost in the details. Where competing hypotheses exist he picks one and runs with it, rather than detailing the academic debates and different schools of thought. It is a stylistic choice that I can get behind given the quality of the writing that follows.

Because make no mistake, Halliday knows how to craft captivating prose. He won the Hugh Miller Writing Competition in 2018 and the John C. Marsden Medal from the Linnean Society for the best doctoral thesis in biology in 2016. Reading Otherlands, it is easy to see why. I do not know what they feed Scottish palaeontologists, but I was reminded of Elsa Panciroli’s Beasts Before Us. Let me back up my enthusiasm with some quotes that can only touch on a fraction of what is on offer.

There are the obvious imaginative metaphors to describe animals. The Triassic gliding reptile Sharovipteryx mirabilis (225 mya) is imagined looking rather inelegant once landed “with its membrane retracting and limbs thrown all directions like a collapsing deckchair” (p. 159), while the Ediacaran sedentary animal Dorothy’s Rope (550 mya) resembles upright towers “composed of bulges like knotted rope, as if Gaudi had designed an industrial town” (p. 277). Other descriptions are more poetic. Basilosaurids, the first fully aquatic whale ancestors in the Eocene (41 mya), have yet to evolve the melon organ. They “can listen to the music of the oceans, but they have not yet learned to sing” (p. 86).

Particularly powerful are his reflections on deep time. A recurrent theme in this book is that of impermanence: “gatherings of species in time and space may give the illusion of stability, but these communities can only last as long as the conditions that help to create them persist” (p. 18). Some ecosystems never return. The long-lived Jurassic crinoid colonies (155 mya) that made a home on floating logs blown into the sea during storms disappeared when the evolution of shipworms made “this way of life impossible, something that can and will never be replicated in quite the same way again; wood just doesn’t float for as long as it used to” (p. 151). And while the world feels old in our day, it is easy to forget the world was already old in the deep past. The mountains of the Triassic (225 mya) “are built from the deep sea”, within which can be seen “the coils and shapes of the long-extinct creatures of the Carboniferous seas, well over 100 million years old even now” (p. 158).

What made my hair stand on end were Halliday’s reflections on phylogenetics, the evolutionary relationships between animals. I love how he drowns scientific concepts in poetic language. Take the Paleocene Baioconodon (66 mya). Beyond one of the earliest placental mammals, we do not really know what it was. “Their anatomy is too non-committal, too similar to and yet too distinct from too many living orders to be placed with confidence. […] They are an unspecialised, Platonic placental, a lump of living clay from which all others are stretched, pinched and pulled into shape” (p. 105). We cannot even describe its young as kits or calves: “it does not yet make sense to talk of cattle or dogs, of monkeys or horses. None of these groups exist yet […] names lose tangibility in the depths of the past, and our language has no description for the young of common ancestors” (p. 104). You start to see why Halliday wrote his way backwards from the present. He makes a similar observation about the Ediacaran biota. Alien to us, “they are aberrant only from a modern perspective” (p. 282). Our confusion is partially because “we are trying to define them the only way we can: on the basis of those few survivors to have found paths to the present”, while the dead-end branches “by the simple fact of having not survived, forfeit a common name” (p. 283).

Similarly spine-tingling are his explanations of evolutionary processes. Species names are artificial designations for a continuous phenomenon. The way palaeontologists deal with this can be compared to rivers. Just as a river can split and its two branches be called by two names from that point in space forward, so can a species that spatially separates be called by two names from that point in time forward. And why did so many higher taxa appear during the Cambrian explosion? One idea is that, once in place, fundamentals cannot be changed easily: “evolution today can only be played within the constraints set by the past”. Another idea is that “there is nothing intrinsically impossible about a new body plan developing today, were it not for the existence of others”. Gould wrote of filling the ecological barrel and Halliday puts it thus: “establishing the basic roles within an ecosystem is like adding large rocks into a barrel […] evolutionary processes […] adding in finer and finer divisions of ecological processes, pebbles and sand falling into the barrel between the gaps left by the larger stones, structures built on other structures” (p. 258). Not only does this ring true, but it is also truly beautiful language.

Otherlands is an exceptional debut that can be savoured like a fine wine. I found myself reciting passages to anyone within earshot. Beyond a fascinating tour of extinct lifeforms, Halliday’s carefully crafted yet poetic descriptions of scientific concepts are a masterclass in spellbinding science communication.

You might also be interested in our Q&A with Otherlands author Thomas Halliday where we discuss the book and the process of writing it, our endless fascination with dinosaurs and the lessons we might learn from studies of deep time.

Thomas Halliday. Credit: Desiree Adams ,Penguin Random House

In the Field – Hawke Endurance ED Marine Binoculars 7 x 50

Introduction.

Choosing the right binoculars for either your hobby or work is something you should spend time on. While using binoculars on dry land sometimes has challenges with poor weather conditions, if you then wish to use a pair of optics out at sea, you should consider some additional points.

Wind, changing light conditions and weight are amongst the deciding factors on what makes a good pair of optics but add variable movement and changing landscapes to the list of elements to assess a pair of binoculars and you need to review your selection even more carefully. I’m very lucky to be able to have access to a boat for cetacean spotting and surveying. With that in mind, I decided to put the Hawke Maritime 7 x 50 binoculars through a test. But one thing that always makes it a challenge is the sea state, coupled with fast-changing light and weather conditions. Many of the points outlined below still form part of the normal considerations for use on land, but I’ve tried to extend the thoughts to the case of ‘at sea’.

What to look for in a pair of marine binoculars?

Crisp image

I have found that some binoculars are let down, not by the amount of light going through the lens elements, but by the overall quality of the image. While a bright image is important, chromatic aberrations can cause issues with the identification of surface or flying objects, especially when they are near the edge of the field of view. When the sea state is above 1 (calm or glass-like), there is more movement in the wave height and the amount of time you have to determine the object on the far side of the wave is reduced. Is it a bird, or a dorsal fin? At certain times of the year, it becomes even more of a challenge when you have adult guillemots on the surface of the water with their black and white bodies that can look like the dorsal fins of cetaceans.

This is also important with the large field of view. Maritime binoculars are all about the amount of vision you have. If you are a skipper on a boat and need to make decisions that affect the safety of your vessel, then seeing more of what is at a distance from you is critical. The choice of a BaK-4 Roof prism also plays into the quality of the image as this design of prism is reserved for higher-end products, and it shows with the quality of the image.

Brightness

The overall brightness of the image in all weather conditions is a big help. Timed survey periods for cetaceans rely on the confidence of the surveyor in deciding what they have seen. Whether the light is behind you or in front, the subject brightness needs to be enough to see markings, details of any dorsal fin damage (nicks, cuts), and for the assessment of age. Typically, the youngest calf will have fetal folds on its body, and a bright image will assist in making out those factors to allow assessment of age as they lose these folds after about six months. The Hawke Endurance ED Marine binoculars come in two sizes of front element, the larger giving a brighter image, but at the cost of weight (see below) with the larger binoculars being over 50 per cent heavier than the smaller version. I tested the 7 x 50 version which did not disappoint in brightness and, in my opinion, worth the cost in weight.

Wide field of view

The difference between the two main pairs of binoculars in the range from Hawke is dictated by size. The smaller version (not tested) is lighter in weight and contains a smaller front element (less brightness compared with their larger version) but with a greater field of view. This may be part of your decision for the selection as it is worth remembering that the amount of extra view may not be as much as you first thought. A useful tip to remember is that one degree of field of view equates to about 17.5 meters at a distance of 1000 meters. So the difference between the two versions of the maritime product is just under 23 meters of view!

Waterproof

The binoculars have been rated IP67. Technically they are waterproof and can be immersed in water for a short period of time without any problems. Hawke have given consideration to this by adding a set of float-assisted neck straps. Coloured bright yellow, it makes it easy to spot should you accidentally drop them over the side of the boat. The strap will keep them afloat. Needless to say, I didn’t test this benefit! It is also worth keeping a cloth with you for wiping away the salt water as, no matter how durable a pair of binoculars can be, sea spray will eventually damage the product.

Weight

The 7 x 50 binoculars compared with many others are no heavier than the average. However, my view on weight is reflected by the circumstances of use. If you intend to use them on a boat, and the conditions are less than calm, then holding them with one hand while using your other hand for stability is a great test. Long periods of time holding them in one hand can start to strain the wrist. Using the neck strap is important.

Conclusion

I found the 7 x 50 binoculars to be a joy to use. Overall, the specifications have been well thought through, and provide the majority of what you would need to survey. They even produce a version with a compass built in, which I can imagine would be a further benefit for recording the sighting direction when surveying. They are comfortable to hold and generate a bright image, making it easy to identify the subject matter. It should also be noted that Hawke provide a lifetime warranty on product defects, which I feel is an outstanding part of the manufacturer’s services.

The Hawke Endurance ED Marine Binoculars can be found here. Our full range of Hawke Optics binoculars can be found here.

If you have any questions about our range or would like some advice on the right product for you then please contact us via email at customer.services@nhbs.com or phone on 01803 865913.

Book Review: Cry of the Wild: Eight Animals Under Siege

Cry of the Wild: Eight Animals Under Siege is a unique take on nature writing, blurring the lines between non-fiction and fiction and harking back to Henry Williamson’s Tarka the Otter and Richard Adams’ Watership Down. Written by the author of several loved books such as The Screaming Sky and Being a Beast, it is an original and creative book that aims to change our perspective on how the way we live is impacting animals. The book is split into eight chapters (plus an epilogue), each following a species ‘under siege’, beginning with foxes and ending with eels. The chapters follow the stories of anthropomorphised individuals as they try to navigate life impacted by the human world.

The Living Planet Report, published in October 2022, highlighted the impacts of the interlinked threats of human-induced climate change and biodiversity loss. Using datasets from almost 32,000 populations of 5,230 species across the planet, this comprehensive report shows that populations have declined by an average of 69% between 1970 and 2018, with land-use change being the most significant driver of biodiversity loss. Human activity is having a profound impact on the environment and ecosystems, and Charles Foster shows us this impact through the perspective of the animal, from an orca whose pod tries to survive in a polluted, overfished ocean to a gannet struggling to breed.

The third chapter is on humans, with the narrative following a child as they try to navigate and come to terms with a world that is being degraded by human activity. Foster is clear in the introduction that he views humans as also under siege, that we are part of the animal kingdom and therefore also suffering due to the declining health of our planet. Foster wrote Cry of the Wild as a way of introducing fresh storytelling to combat the fatigue many of us are experiencing when faced with the barrage of news about climate change and environmental destruction, which often leaves us numb and in denial. This chapter is a heartfelt representation of the struggles we face when trying to remain engaged with what is happening to our natural world.

Mayfly by Johan J.Ingles-Le Nobel via Flickr

Many of the species covered in the book are freshwater species or those that rely heavily on freshwater habitats, such as otters, mayflies and eels. Our freshwater environments, especially those in the UK, are heavily degraded, facing a wide range of constant threats such as pollution from sewage discharges and agricultural runoff to canalisation and invasive species. The mayfly is a particularly interesting species to pick, as insects are often overlooked in favour of more charismatic species when trying to encourage more people to act and empathise with conservation projects. However, there are 51 species of mayfly known in the British Isles, and they play a vital role in the freshwater ecosystem, providing a food source for many species such as trout, salmon, woodpeckers and dippers. Their larvae are opportunistic feeders, consuming detritus, plant matter and other insects. They are also used as an indicator species, as they are impacted by poor water quality. Chapter four highlights the fragility of their declining populations, showing how one single landowner practising poor management along a river system could devastate that ecosystem.

Throughout the book, humans are portrayed as villains and saviours, invaders and carers, showing the complicated and multifaceted ways we interact with nature. Cry of the Wild is a distinctive and engaging book that explores the impacts of our society on the environment in a novel, accessible way. By inviting us to experience the consciousness of his eight protagonists, Foster creates a poignant warning about how we treat animals and their habitats.

Cry of the Wild: Eight Animals Under Siege
By: Charles Foster
Hardback | May 2023

Buyers’ Guide: Trail Cameras

Quick links:
Introduction
Key features
Our suggestions
Accessories
Recommended reading

Introduction

Trail cameras are an invaluable piece of technology allowing users to monitor wildlife without disturbing the animal. The trail cameras in our range can take pictures and video during the day and at night using infrared (IR) imaging technology. Likewise, they can endure tough conditions, surviving harsh winds, rain and extreme temperatures making them suitable for almost all situations.

At NHBS we sell a wide range of trail cameras, and while this does give customers plenty of choice, it can sometimes be difficult to decide which camera will best suit your situation and requirements. The information in this guide will help you to make an informed choice.

Key features

No-glow or low-glow?

There are two main types of IR LEDs that trail cameras use to capture images in low-light conditions: no-glow and low-glow. No-glow LEDs produce a very small amount of visible light which is not visible to the human eye, animals will likely see very little of this light; although, this may well depend on the species. Low-glow LEDs do produce a faint glow, and so are not completely invisible and may alert certain animals. One advantage of low-glow cameras is their capacity to illuminate over a longer range.

Trigger speed and recovery time

Trigger speed is the time taken for a trail camera to take a photo once movement has been detected. Recovery time is how long it takes for a camera to take a photo and be ready to capture another one. A camera with a rapid trigger speed like the Browning Spec Ops Elite HP5 is ideal for capturing images of fast-moving creatures. Likewise, if you are looking to capture multiple images in a short time frame, a trail camera with a speedy recovery time is the best option. Once more, this is perfect for those quick-moving animals.

Resolution and interpolation

Resolution is a major influence on the quality of your images and videos. It is important to bear in mind, however, that the photograph megapixel ratings offered by manufacturers are often inflated and the result of a process called interpolation. Many trail cameras have the option of adjusting the resolution – increasing it through interpolation or decreasing it through compression. Compression can be useful for saving storage space by reducing the number of pixels. Interpolation digitally adds pixels to an image which eats up storage and generates longer recovery times while doing next to nothing to enhance picture quality. The best way to compare picture quality is to look at sample photographs.

Flash range and motion detection range

If you are planning on monitoring an open area where you expect animals to pass by at a distance, the motion detection range and flash range of a trail camera are worth considering. Motion detection range is the maximum distance a trail camera can register the movement of an animal. The flash range is how far the IR flash will reach. If the flash range is low and an animal is at a distance, you may not see the animal clearly in low-light pictures.

Cellular and solar cameras

Cellular cameras are an excellent choice if you are looking for remote access to your trail camera’s photos and settings without having to regularly interact with your camera in the field. Likewise, the addition of a small solar panel to your trail camera can improve deployment time. This is particularly useful when deploying multiple cameras at the same time or when monitoring inaccessible locations.

Our range of Spypoint cameras are an excellent choice when considering cellular or solar cameras. The Spypoint CELL-LINK, however, enables cellular functionality for trail cameras from non-Spypoint brands and you can purchase solar panels for Bushnell and Browning cameras.

Our suggestions

Entry-level cameras

The Browning Strike Force Pro X 1080 is ideal for those looking for high quality at an affordable price. This low-glow Browning camera boasts a rapid 0.22 second trigger speed, a colour screen, and superb picture quality.

Alternatively, if you are looking for an economical no-glow camera, the Browning Dark Ops Pro X 1080 is an excellent choice.

Popular cameras

The Bushnell CORE DS-4K is an excellent trail camera featuring top-of-the-range picture quality and no-glow IR LEDs, keeping disturbance to a minimum. Additionally, this camera will last for an extended period out in the field due to its long battery life.

Another trail camera with excellent picture quality, the low-glow Browning Recon Force Elite HP5 is an outstanding all-rounder. One benefit of this camera is its longer IR flash range when compared to the Bushnell CORE DS-4K, allowing for improved low-light imagery when the animal is further away.

If you are monitoring a particularly quick species, the Browning Spec Ops Elite HP5’s trigger speed can be adjusted to a lightning-fast 0.1 seconds. This stealthy no-glow camera also features a rapid 0.5 second recovery time and excellent picture quality both during the day and at night, making it one of the top trail cameras in our range.

Accessories

Powering your trail camera

Lithium batteries are essential for operating your trail camera effectively. One of the most common reasons for why a trail camera is not working properly is the use of non-lithium batteries. Most of our trail cameras can be purchased as part of a bundle which includes lithium batteries and a suitable memory card.

Keeping your trail camera safe

The 180cm long Python Lock is ideal for securing your trail camera to trees and posts and preventing theft.

Our range of security boxes will provide additional protection against theft and damage. Double check that the security box you are purchasing is compatible with your trail camera model.

Buyers’ Guide: Bat Boxes

Quick links:
Introduction to bat boxes
Bat box design
Bat box materials
Mounting and installing bat boxes
Further information
Accessories and suggested reading

Introduction to bat boxes

Globally there are over 1,400 different species of bat and the UK inhabits 18 of these bat species. Although UK bat species do not create their own roost sites, they will roost in trees and occupy spaces that are created by other animals or decaying trees. But due to the removal of trees and suitable habitat, bats will now often favour human-made roosting sites. The addition of available roost sites is an important way to help prevent the ever-declining UK bat populations.

When choosing which bat box fits your needs, there are a few things to consider – the design of the bat box, the material, and the mounting and installation method. These features can be determined by identifying the target bat species alongside the location and habitat you wish to situate the bat box.

Bat box design

There are several types of bat box design and these can be split into crevice, cavity and hybrid boxes, as well as hibernation, maternity and heated boxes.

Crevice boxes provide a narrower roost space for species that naturally prefer smaller roosts, such as Brandts, Natterers and Pipistrelles, whereas cavity boxes offer a more spacious roost space favoured in general by the larger bat species such as the Greater and Lesser Horseshoe, Barbastelle and Brown Long-eared. Some boxes are designed to be hybrid boxes, meaning they can accommodate both cavity and crevice bat species.

Crevice: Low Profile WoodStone Bat Box

Cavity: Improved Cavity Bat Box

Hybrid: General Purpose Bat Box

Hibernation and maternity boxes are similar in their design to provide a warm and safe roosting space. Both boxes tend to be well insulated and larger in size with multiple internal chambers, especially important for maternity boxes that accommodate breeding colonies. There are also heated bat boxes; in these, the temperature is controlled by an external thermostat and can aid with mitigation schemes for the loss of bat maternity sites.

Hibernation: Large Multi Chamber WoodStone Bat Box

Maternity: Causa Maternity Bat Box

Heated: Heated Bat Roost Box

Bat box materials

Bat boxes can be made from a number of different materials; these vary in longevity, durability and often price. The most common materials are wood (often timber); a wood and concrete blend, sometimes known as woodstone or woodcrete; eco-plastic; and concrete. Below is a brief description of each alongside one of our best sellers.

Wooden bat boxes

Lightweight
Suitable for externally mounting on both trees and buildings
Less robust and shorter longevity than woodstone/woodcrete boxes

Double Chamber Bat Box

Woodstone and woodcrete bat boxes

Very durable and long-lasting
Well insulated
Can be built in or externally mounted to buildings
Heavier than wooden and eco-plastic boxes

Beaumaris Woodstone Bat Box

Eco-plastic bat boxes

Sustainably sourced recycled plastic
Lighter than woodstone/woodcrete and more durable than wooden boxes
Although made from recycled plastic, it is still plastic

Integrated Eco Bat Box

Concrete bat boxes

Very durable
Very heavy and can only be built directly into buildings

Bat Block

Mounting and installing bat boxes

Bat boxes fall into externally mounted or integrated boxes. Mounted boxes can be fixed to trees, fences or buildings, and integrated boxes are built directly into the brickwork of a building.

Externally mounted boxes can vary in size and material, and often they are wooden or woodstone/woodcrete. When choosing an externally mounted bat box, it is important to consider the weight of the box and the surface you are mounting the box to. Some are lighter and ideal for mounting on trees, while some are more durable and can be fixed to buildings.

All bat boxes should be positioned in an open and sunny location (ideally boxes should have 6-8 hours of direct sunlight), around 3-6 metres high (the higher the better). It is important to avoid placing these close to any artificial lights such as streetlamps or security lights. External mounted boxes can be attached via a hanger or fixing bracket and it is best to fix using aluminium nails.

Vivara Pro WoodStone Bat Box

2F Schwegler Bat Box (General Purpose)

Integrated bat boxes are self-contained concrete roosts. They are popular with new housing developments as they are unobtrusive and often aesthetically pleasing. The boxes can be built flush to the wall or beneath a rendered surface, and each box has an entry point that must be left exposed for the bats to access the box. Some boxes are plain for rendering or can be custom faced with a chosen brick type which adds to their discreteness.

Habibat Bat Box 001

Vivara Pro Build-in WoodStone Bat Box

There are also pole-mounted bat boxes (sometimes known as rocket boxes). These bat boxes are helpful alternatives in areas where there is nowhere to mount the bat box. An additional benefit is that they ensure that the bat box gains maximum sunlight in shaded areas.

Pole Mounted Large Colony Bat Box

Lastly, there are bat roost access titles and bricks. These are designed to provide bats with access points within roof or ridge tiles. Some bats will roost in the confined spaces beneath the tiles and others will use the open roof space to roost.

Bat Access Tile Set

Further information

We supply a wide range of bat boxes, and we hope this Buyer’s Guide is informative and provides a useful breakdown of the different types available to help you decide which bat boxes best suits your needs.

For further information, please get in contact with us directly and take a look at our blogs including The NHBS Guide to UK Bat Identification and the NHBS Guide: Where to hang and how to maintain your bat box.

Accessories and suggested reading

Heavy Duty Aluminium Nails

Xtend & Climb Pro Telescopic Ladder

A Miscellany of Bats

Bat Calls of Britain and Europe: A Guide to Species Identification

Our full range of bat boxes can be found here.

If you have any questions about our range or would like some advice on the right product for you then please contact us via email at customer.services@nhbs.com or phone on 01803 865913.

Book Review: Ghosts in the Hedgerow: A Hedgehog Whodunnit

Ghosts in the Hedgerow is the new book by conservation research scientist Dr Tom Moorhouse. His previous book, Elegy for a River, was a heartfelt tribute to UK rivers and included many wonderful tales of his fieldwork adventures beside rivers, fens, lakes and more. He discussed the threats currently facing these habitats and their occupants, the conservation work currently taking place and what he believes is needed to repair the degradation that has occurred. Ghosts in the Hedgerow follows a similar format but instead looks at Britain’s favourite mammal – the hedgehog.

Moorhouse presents the full story of the hedgehogs’ plight in the face of humanity, following three years of conservation research focusing on the species. This book opens with a classic fictional murder mystery scene: the guests are gathered around a detective who announces that a murder has occurred, the murder of a hedgehog. This tongue-in-cheek opening with its amusing if perhaps stereotypical cast of characters makes the data-dense introductory chapter easy to read. Snippets of this continue throughout as welcome breaks to the often sombre topics covered. The book is split into five more sections, the first four covering each main ‘suspect’ in the decline of hedgehogs: cars, agriculture, modern gardens, and the badger – a species which is also the focus of conservation efforts. The final section ‘A Murderer Unmasked’ and the afterword ‘One Final Word’ presents Moorhouse’s solution.

The second chapter, ‘Driven to Destruction’, highlights the main obstacle behind identifying the significant causes of hedgehog decline and developing an effective solution: the lack of accurate population estimates. It is generally quoted that there were around 36 million individuals in the 1950s. But it is worth noting that this number was based on one ‘survey’ where ten hedgehogs were seen in ten acres on a single walk, thus estimating a population density of one hedgehog per non-urban acre in Great Britain, regardless of habitat type (excluding upland areas where hedgehogs are known to be scarce). Current estimations of the overall population are based on various smaller surveys of hedgehogs within certain habitats, with that data extrapolated based on the amount of these habitats in the UK. But due to the small number of these habitat surveys and their short study time, each current population estimate has limited reliability. Without accurate and reliable population estimates, the true impact of the various threats is unclear, and the implemention and monitoring of conservation efforts can be jeopardised.

Moorhouse also highlights another issue with hedgehog conservation, or with conservation in general, in chapter three, ‘The Tale of Tommy Brock’, – trade-offs. No conservation effort occurs in a vacuum, just as no species lives in a vacuum. Any efforts made for one species will likely have an impact on another, whether that be positive or negative. Badgers have faced decades of persecution, often being the scapegoat of many agricultural issues. Their populations had declined so much that they were considered uncommon, until the 1980s when concerted efforts were made to protect them. Badgers are now one of the most protected species in the UK and their numbers are up 50-80% (depending on the survey data). Ghosts in the Hedgerow discusses one of the potential environmental trade-offs of this conservation success – the impact on hedgehogs, one of the badgers’ prey items. Hedgehogs tend to avoid badgers, so they are increasingly pushed out of more and more areas as badger numbers increase. This story is not as simple as it first seems, however, as badgers are found not to be the most important factor when studies examined hedgehog densities. Additionally, as Moorhouse points out, badgers and hedgehogs have coexisted for thousands of years; while they may be contributing towards hedgehog decline, it is unlikely that they are the root cause.

Throughout the book, Moorhouse takes these complicated factors and picks them apart, examining the reliability of the data and challenging baseless assumptions. He discusses the impact of hedgerow removal in the 1930s and 40s, the emerging threat of automatic lawnmowers, the problem of enclosed gardens and the reluctance of landowners to cut holes into fences for ‘hedgehog highways’. He includes injuries caused by strimmers, the impact of slug pellet overuse, the massive loss of invertebrate biomass and diversity, and the increasing impacts of agricultural conversion and intensification, and urban expansion. Each one of these stressors may have been survivable on its own if it weren’t for the others. Therefore, it is not one ‘murderer’ but the synergistic interaction between a combination of stressors creating a cumulative effect on hedgehog populations. Moorhouse refers to it as ‘death by a thousand cuts’.

The final sections of Ghosts in the Hedgerow, chapter six ‘A Murderer Unmasked’ and the afterword ‘One Final Word’, is where Moorhouse presents his solution. The important part of any conservation proposal is to make sure, as Moorhouse puts it, it doesn’t result in a “trade-off in human lives”. Moorhouse suggests small lifestyle changes, for instance reducing your meat intake, particularly beef as its production is a major cause of biodiversity loss and global emissions; purchasing food from farms that use less environmentally harmful chemicals or practices; writing to MPs about local ventures such as planting street trees and traffic reductions; recording hedgehog sightings; and allowing your garden to become wilder and more accessible. The book ends on a final word, a collation of advice from several well-known and passionate hedgehog lovers, experts and authors, including David Wembridge, Hugh Warwick and Pat Morris. He believes that these small-scale personal changes, alongside more large-scale governmental and policy changes, such as more environmentally friendly regulations for new building developments, more sustainably managed public green spaces and serious reductions in consumption and food waste, might give hedgehogs the best possible opportunity to thrive.

Ghosts in the Hedgerow is a funny but serious, light-hearted but uncomfortably honest lament for the plight of our favourite mammal and a strong call for widespread conservation to be implemented. It is a well-researched and compelling read, filled with footnotes, puns and anecdotes that bring this topic to life. This truly is the perfect read for anyone who loves hedgehogs, wants to be more wildlife friendly, or is just interested in the complicated problems of conservation efforts in Britain.

Ghosts in the Hedgerow: A Hedgehog Whodunnit
By: Tom Moorhouse
Hardback | March 2023

Buyers’ Guide: Sweep and Butterfly Nets

Quick links:
Introduction
Key features
Entry-level choices
Best sellers
Accessories and suggested reading
More information

Introduction

Insect nets are one of the most iconic tools of the entomologist’s kit bag. Around since at least the 1840s, the earliest forms would not have been dissimilar in design or use to those still widely used today. They are, most basically, a deep net bag made of material that is robust but gentle enough not to damage the captured insect, designed to be swept across grass or other vegetation or to catch flying insects as they are spotted. That said, in the last 180 or so years a number of different designs have arisen, making it hard for the aspiring entomologist to choose where to begin.

Sweep nets and butterfly nets – what’s the difference?

As the name may imply, the main difference between a sweep net and a butterfly net is the group that they are designed to catch, and by extension the way in which they are used. Sweep nets are designed to sample a wide range of insects, from flies to beetles, and are usually swept across the tops of vegetation such as long grass before inspection. Because they often come into contact with woody plants and the like, the frame is reinforced and the net material must be reasonably robust to prevent tearing. This has the drawback of making it a little heavy and coarse, and thereby potentially damaging to the wings of very delicate insects like butterflies.

Butterfly nets, on the other hand, have bags that are made from a much lighter, finer material that is less likely to damage delicate invertebrates. This makes them suitable for a few groups, including craneflies, but most notably Lepidoptera (butterflies and moths). Of course, the finer mesh is more delicate and likely to be torn by vegetation or powerful insects such as crickets and large beetles.

For the purpose of this buyer’s guide, the term ‘insect net’ will be used when referring to principles that are true of both butterfly and sweep nets.

Key features

Many entomologists relish the challenge of finding a remote, hitherto unexplored site, far away from the beaten path, with undisturbed habitats where anything might be hiding. The equipment we carry, however, can quickly mount up – an insect net, spare bags, pooter, beating tray, collecting tubes, notebooks, camera, not to mention lunch – and can weigh a lot. Many entomologists, therefore, begin with lightweight, compact gear that can be easily transported.

In our opinion, the qualities that determine a desirable insect net are weight and balance, as these will determine how comfortable the user is during long sampling sessions, and the aperture of the frame, as a larger opening means more air passes through, allowing larger sample sizes. But there is always a trade-off. Lighter frames are easier to carry but are less robust. Telescoping handles are portable but are generally made of metal and therefore heavier than a wooden alternative. Larger apertures, though better for sample size, are much more unwieldy than smaller counterparts. The trick to finding a net that really works for you is finding a balance between all these factors.

Frame shape

The ‘head’ of an insect net can be designed in a few different ways; different shapes can maximise the area sampled, and foldable and crushable designs can improve portability. Most entry level nets have a frame that is a simple loop of metal – this keeps them lightweight and cost effective, but limits the size that they can practically be.

Beyond entry level, sweep and insect nets tend to adopt more complex designs, but they are generally split into three categories: fixed, folding, and crushable frames. Fixed frames are built using the same principle as simpler nets, but often have a pentagonal shape. This increases the overall aperture size without making the net much bigger, allowing for larger samples. Folding frames are usually roughly triangular, and can be folded to make transport easy.

Finally, some butterfly nets are made with a crushable frame. The loop is made of a thin strip of metal that can be twisted around on itself, allowing the net to be stored in a small stuff bag. These are extremely portable, but over the course of use tend to become a bit warped. Crushable frames are generally only used for butterfly nets, as the metal is too lightweight to be robust enough for sweeping across vegetation.

Handle design

When it comes to nets, there are a few considerations to bear in mind. Early insect nets, for example, tended to have quite long handles. But is this necessary? Sweep netting in particular is often carried out at waist height, within easy reach as you walk through a meadow. Not only is it unnecessary in many cases, it is often counterproductive. The longer the handle, the less control you have over the path the end takes, after all. You can extend your arm to reach an insect that is further away, but it is much harder to accurately catch an insect that is too close for your net. A longer handle will also cause wrist strain more quickly, as the weight of the bag and frame cause the net to become poorly balanced. Most basic nets – particularly sweep nets – are therefore given a short handle to stay light, well balanced and portable.

That said, a longer handle can still be of use. You may want to sample from trees above head-height, for example, or target a group that is very visual and likely to flee before you get close enough for a short-handled net. One such group is Lepidoptera, and for this reason some butterfly enthusiasts prefer butterfly nets with a longer handle. You’ll see long-handled nets used for catching flying invertebrates referred to as ‘aerial nets’ in some literature.

A good option for either net type is a telescopic handle. This allows the user to decide what length is best for them, and affords some flexibility for activities, such as sweeping around trees. They tend to be heavier and less well balanced than non-telescopic alternatives though, and can be prone to breaking over longer periods of heavy use.

Entry-level choices:

Bestsellers:

Accessories and suggested reading:

More information:

The NHBS Guide to UK Butterfly Identification

The NHBS Guide to UK Bumblebee Identification

The NHBS Guide to UK Hoverflies: Part 1

The NHBS Guide to UK Hoverflies: Part 2

Equipment in Focus: Spring Frame Butterfly Net

Our full range of sweep nets can be found here. Our range of butterfly nets can be found here.

If you have any questions about our range or would like some advice on the right product for you then please contact us via email at customer.services@nhbs.com or phone on 01803 865913.

2022 author interviews, book reviews and field tests

At NHBS we love nothing more than chatting with the authors of our favourite books about their lives, passions and publications. Interested in the authors we talked to in 2022? Here we’ve listed all of the books that we were fortunate to cover this year along with the titles that have been reviewed on our blog and the equipment that we tested in our regular ‘In the Field’ series.

Author Q&As

The Secret Perfume of Birds with Danielle Whittaker

“I started out with simple, clearly defined experiments to test the birds’ reaction to odours from other birds. Then moved on to working with chemists to analyze the information content present in the odours given off by birds. Little by little, the scientists who heard about work in this area started to pay attention…”

Otherlands with Thomas Halliday

“We mustn’t fall into the trap of thinking that humans can only be destructive, or that we are separate from the ecosystems we live in…This is the Earth we live in, and we are part of this world, but worlds can change in a moment.”

The Secret Life of the Adder with Nicholas Milton

“The book is my attempt to conserve the species using a 10-point adder action plan, and wake up the government, its nature conservation agencies, the media and the public to its plight before it is too late.”

Field Guide to Whales, Dolphins and Porpoises with Mark Carwardine

“It’s true to say that our knowledge of cetaceans has grown from virtually nothing to just a little bit – despite decades of wild whale research. They are incredibly difficult animals to study, because they spend most of their lives underwater, often live far out to sea and regularly travel vast distances.”

Why Sharks Matter with David Shiffman

“As a marine conservation biologist who studies sharks and how to protect them, I know that we need the public to not only no longer fear sharks, but to value the role they play in the ecosystem and to want them around.”

Wildlife Photography Fieldcraft with Susan Young

“Wildlife photography is hugely important as photographs can convey an emotion or fact better than words, and in particular can illustrate features or situations in a compelling, thought-provoking way, or simply attract by their beauty.”

The Fragmented World of the Mongoose Lemur with Michael Stephen Clark

“Perhaps, more alarmingly, the mongoose lemur has unwittingly become a prima-facie example of something disquieting; namely, a growing acceptance that nature will be allowed to persist only in places of our choosing.”