Over the last century, land use in the UK has changed drastically. Small mixed-crop farms, traditionally separated by lanes, hedgerows and wild meadows have been replaced with larger, more specialised facilities. At the same time, the density of grazing animals such as sheep and cattle has also risen substantially. This combination of land-use change and agricultural intensification has contributed significantly to habitat degradation and biodiversity loss, and has led to huge, often dire, changes for the wildlife that call these places home.
Understanding these processes is of huge importance to conservationists, and a considerable amount of research has been conducted into the broad scale effects of land use changes on biodiversity. It is less well understood, however, why seemingly similar species can be affected to a different extent by local changes in their habitat.
A recent study, conducted by Dr Andrew Higginson at the University of Exeter, suggests that competition for nesting space may be a key factor in the differences observed. His study used a mathematical model to predict the likely outcome when populations of birds and bees are faced with a reduction in suitable nesting sites. Results indicated that larger, earlier-nesting species tend to fare better in these conditions, but at the expense of smaller, later-nesting species who, in the real world, would either fail to find a nesting site or be forced into using a poor quality or risky location.
Dr Higginson’s results illustrate that, whilst two or more similar species can co-exist together very happily when there are sufficient nesting spaces available, as soon as these become limited, competition and conflict become inevitable. In severe situations, species that have historically thrived in the same environment may suddenly find themselves battling for survival.
A key message from the study was that conservation efforts should ensure that priority is given to the creation and maintenance of suitable nesting sites. Conservation practices often focus on provision of food for wildlife, such as planting wildflowers for bees and providing food for our garden birds. Preserving and creating safe and accessible places for these animals to nest, however, is just as critical if we are to ensure their continued survival.
The accumulation of stacks of pallets is an unavoidable part of working in a fast paced and varied retail environment. So when we were contacted by Keith Grant from the Slapton Ringing Group to ask if they could take some off our hands, we were both delighted to agree and eager to learn about the site where they would be put to use.
The Slapton Ringing Group is based at the Slapton Ley National Nature Reserve. This beautiful site is located on the south coast of Devon and contains the largest lake in the south west, separated from the sea by just a narrow shingle bar. Its location, together with the unique habitat conditions, makes it an extremely important place for local and migrating bird populations.
The Slapton Ringing Group have been surveying birds at Slapton Ley since the 1960s, and for the last six years the site has been designated as a BTO Constant Effort Survey (CES) Site.
A regular rotation of willow cutting is undertaken at the site, which maintains the vegetation and helps to avoid major changes in species composition. A carefully constructed pallet walkway allows access to the ringing rides for the volunteers that meet here regularly throughout the ringing season.
The pallets salvaged from NHBS were used to replace old ones which have an obviously limited lifespan due to the constantly wet conditions. It is a pleasure to know that some of our “waste” is being used to support such a fantastic and long-running project.
The Sensory Ecology of Birds is a fascinating new work that explores the sensory world of birds from an evolutionary and ecological perspective. The author Professor Graham Martin gives us some insights into his inspiration, the incredible diversity of avian sensory adaptations, and how studying sensory ecology can help in developing practical conservation solutions.
How did you first become interested in bird senses?
Through owls. As a child I used to listen to tawny owls calling all through the night in a nearby wood and I wanted to know what they were doing and how they did it. My father took me round the woods at night and that experience led me to wanting to know more about the eyesight of owls.
What inspired you to write the book and what kind of readers do you think would find it useful?
I have been studying bird senses all of my working career. Nearly 50 years ago I started to get paid for looking into bird senses; it has been a strange and exciting way to spend my time. After such a long time of investigating the senses of so many different birds I wanted to bring it all together, to provide an overview that will help people understand birds from a new perspective. I think anyone interested in birds will enjoy the book and find it useful. No matter which group of species intrigues you most, this book will enable you to see them from a new perspective. Understanding bird senses really does challenge what we think birds are and how they go about their lives.
Sensory ecology is a relatively new field of research; could you explain a little about what it is and what makes it particularly relevant today?
Sensory Ecology is basically the study of the information that birds have at their disposal to guide their behaviour, to guide the key tasks that they perform every day to survive in different types of habitats. Different habitats present different challenges and to carry out tasks animals need different sorts of information. Birds have at their disposal a wide range of different sensory information, they are not just reliant upon vision. However, each species tends to be specialised for the gaining of certain types of information. Just as each species differs in its general ecology, each species also has a unique suite of information available to them. Sensory ecology is also a comparative science. It compares the information that different species use and tries to determine general principles that apply to the conduct of particular behaviours in different places. For example how different birds cope with activity at night or underwater.
Sensory Ecology also looks at why evolution has favoured particular solutions to particular problems. I think the major result of this kind of approach is that it certainly challenges our assumptions about what birds are and also what humans are. We do not readily realise that our view of the world is very much shaped by the information that our senses provide. We are rather peculiar and specialised in the information that we use to guide our everyday behaviours. My hope is that people will come to understand the world through birds’ senses, to get a real “bird’s eye view”. In doing so we can understand why birds fall victim to collisions with obvious structures such as powerlines, wind turbines, motor vehicles, glass panes, fences, etc. We can then work out what to do to mitigate these problems that humans have thrown in birds’ way.
An understanding of how a species perceives its environment can be very useful in designing practical conservation measures. Could you give us some examples?
Yes, I have been involved in trying to understand why flying birds apparently fail to detect wind turbines and power lines, or diving birds fail to detect gill nets. These investigations have led to a number of ideas about what is actually happening when birds interact with these structures and what we can do to increase the chances that birds will detect and avoid them.
How do you think that studying avian sensory ecology can enhance our understanding of our own sensory capabilities and interaction with the world?
It gives a fresh perspective on how specialised and limited our own view of the world is. We make so many assumptions that the world is really as we experience it, but we experience the world in a very specialised way. Sensory ecology provides lots of new information and facts about how other animals interact with the world, what governs their behaviour, but equally importantly sensory ecology questions very soundly our understanding of “reality”, what is the world really like as opposed to what we, as just one species, think it is like. This is quite challenging but also exhilarating. We really are prisoners of our own senses, and so are all other animals. Sensory ecology gives us the opportunity to understand the world as perceived by other animals, not just how we think the world is. That is really important since it injects a little humility into how we think about the way we exploit the world.
Could you give us some insight into how birds can use different senses in combination to refine their interpretation of the world around them?
Owls provide a good example. Their vision is highly sensitive but not sufficiently sensitive to cope with all light levels that occur in woodland at night, so owls also rely heavily upon information from hearing to detect and locate moving prey. The nocturnal behaviour of owls requires these two key sources of information but even these are not enough. To make sense of the information that they have available to them the woodland owls need to be highly familiar with the place in which they live, hence their high degree of allegiance to particular sites. Other birds, such as ducks, parrots and ibises rely heavily upon the sense of touch to find food items. The degree to which this information is used has a knock on effect on how much the birds can see about them. So a duck that can feed exclusively using touch, such as a mallard, can see all around them, while a duck that needs to use vision in its foraging cannot see all around. This in turn has implications for the amount of time birds can spend foraging as opposed to looking around them, vigilant for predators. In many birds the sense of smell is now seen as a key source of information which governs not just foraging, but also social interactions.
Are there interesting examples of species that are specialists in one particular sense?
Usually birds rely upon at least two main senses that have become highly specialised and which are used in a complementary manner. For example, in ibises it might be touch and vision, in kiwi it is smell and touch, in some of the waders it is touch and taste, but in other waders touch and hearing.
Probably the most obvious single sense specialisations are found among aerial predators such as eagles and falcons, they seem to be highly dependent upon vision to detect prey at a distance and then lock on to it during pursuit. However, we really don’t know anything about other aspects of their senses and there is a lot left to learn about them.
Can you tell us about any species that you have studied that you find particularly fascinating?
Oilbirds; they are really challenging to our assumptions about what birds are, how they live and what information they have available to them.
Oilbirds are the most nocturnal of all birds, roosting and breeding deep in caves where no light penetrates, emerging only after dusk and then flying over the tropical rain forest canopy to find fruit. But they are a form of nightjar! In the complete darkness of caves they use echolocation to orient themselves and calls to locate mates. When searching for food in the canopy they use their sense of smell to detect ripe fruits, they have long touch sensitive bristles around the mouth. And their eyes have sensitivity close to the theoretical limits possible in vertebrate eyes. They seem to rely upon partial information from each of these senses, and use them in combination or in complementary ways. They really are marvellous, but in truth the senses of any birds, and how they are used, are fascinating and intriguing, it is a matter of delving deep enough, and asking the right questions.
In what kind of direction do you think future sensory ecology research is headed?
We now have available a lot of techniques to find out about the senses of birds, from behavioural studies, to physiology and anatomy. Armed with these techniques, and also with ways of thinking and measuring the perceptual challenges of different tasks and different environments, there are so many questions to investigate. We have some fascinating findings but we have only just scratched the surface with regard to species and it does seems clear that senses can be very finely tuned to different tasks. I like to compare the diversity of the bills that we find in birds with the same diversity in the senses in those species.
Every bill tells a story about form and function, about evolution, ecology and behaviour. The senses of birds show the same degree of diversity and tuning. So to me sensory ecology is a wide open field with lot of questions to investigate. To appreciate the world from a bird’s perspective will, of course, give us a much better understanding of how to mitigate the problems that humans have posed to birds by shaping the world for our own convenience.
Tell us a little about your organisation and how you got started.
Third Wheel Ringing Supplies has been trading for about two years and comprises myself and my wife, Mary. We make a small range of equipment for ringers, specialising in traps and particularly trying to fill gaps in the market. Traditionally much of this sort of equipment has either been knocked together by ringers themselves or imported (expensively) from Europe or North America.
Our range is still very small, but it is gradually expanding as we develop more products. Product development is very slow however as, with bird safety being so important, any new product has to be extensively tested before it can be offered for sale. Nevertheless a slightly expanded product range should be launched in the coming months. Our manufacturing ethos is based on quality; never knowingly making sub-standard equipment in the quest for cheaper production costs. Hence our products are not the cheapest available, but they might be the best.
The business started when I took voluntary redundancy from my job. Having worked for (among others) The Wildlife Trusts, RSPB and Local Authorities as a nature reserves manager for 30 years, I was ready for a change. I’ve always liked making things and have a good grounding in engineering which, together with my interest in bird ringing, led onto me making various bits of ringing equipment for my own use and thence onto a small business, making equipment for other ringers.
Why Third Wheel? Well, we had to call it something and, having a slight obsession with classic motorcycles, particularly those with sidecars, the name seemed to fit us as a family.
What challenges do you face as an organisation working in the ecology sector?
One of our biggest challenges has been to persuade ringers not to rely so heavily on mist nets all the time. Although mist nets are very effective for many species and situations, they still have their limitations and traps can often be just as effective or, for some species, the only method of capture. Increasing numbers of ringers are starting to appreciate the value of different trap designs and, as traps form the mainstay of our business, we see this as a good thing!
What do you consider the most important achievement of your organisation in recent years?
On a purely personal level, Third Wheel’s most important achievement has been that, after only two years of trading, it seems to be working as a business. Although I have a passion for what I do, it still has to pay the bills and, for the time being at least, it is doing just that.
It has also been particularly gratifying to have our equipment used to great effect in a number of research projects worldwide. In addition to various projects in Europe, Third Wheel traps are used for chickadee research in Florida, grey jay research in Alaska and snow bunting research in the Canadian Arctic.
Nearer home, highlights have been a customer who caught a dunnock within 7 minutes of the postman delivering one of our traps and another who, on taking delivery of a new prototype, caught 55 linnets on the first morning.
What is your most memorable wildlife encounter?
Having been pursuing wildlife for nearly my whole life, I’ve been lucky enough to have many memorable wildlife encounters, which makes choosing a favourite rather tricky.
I’ve visited Svalbard (what we used to call Spitsbergen) in the High Arctic many times, as a leader of study tours. Here the memorable wildlife moments come thick and fast with polar bear, Arctic fox, beluga whale and countless breeding auks, wildfowl and waders against a stunning scenic backdrop.
On the bird ringing side of things, my best and most memorable ringing sessions have been catches of wigeon, teal and other wintering wildfowl as part of a cannon netting team. Wigeon are amazing little ducks and to ring one in Devon which probably breeds in central Russia is a real privilege.
The bird atlas movement that has swept the world in the last 40 years is surely one of the great recent achievements of citizen science.
More than 400 have been published since the 1970s and it is possible more people have been involved as volunteers than in any other form of biological data collection.
But it was not birders but botanists who pioneered the biological atlas, with the now familiar grid-based dot-maps. The Botanical Society of Britain and Ireland’s Atlas of the British flora was a revelation when it appeared in 1962; half-a-century later American ornithologist Walter Ellison would describe it as the “great-grandfather of the hundreds of natural history grid-based atlases that were to follow in the next few decades as the atlas movement swept over the face of the Earth”.
The story is nicely told in C.D. Preston’s paper Following the BSBI’s lead: the influence of the Atlas of the British flora, 1962-2012. Planning had begun in 1950 and from the start it was intended to be a scientific exercise. The atlas in fact had little impact on science, which had to wait until computers that could analyse the amount of data atlases generate became widely available, but it did have an immediate impact on conservation – leading directly to the first British Red Data Book.
Speaking at the atlas’ launch, Max Nicholson, then head of the Nature Conservancy, described it as a great leap forward. And – we can imagine the great Twentieth Century conservationist had his tongue firmly in his cheek – suggested the ornithologists had been put to shame by the botanists.
Tony Norris, another of Britain’s conservation greats, responded when he and members of the West Midland Bird Club produced the Atlas of the Breeding Birds in the West Midlands in 1970.
The first grid-based bird atlas, modelled on the format pioneered by the botanists, covered the English counties of Staffordshire, Warwickshire and Worcestershire, and inspired the Atlas of Breeding Birds in Britain and Ireland, organised by the British Trust for Ornithology (BTO) and the Irish Wildbird Conservancy, published in 1976.
The 1976 bird atlas was followed by The Atlas of Wintering Birds in Britain and Ireland (1986), The New Atlas of Breeding Birds in Britain and Ireland (1994), and, bringing things right up to date, the Bird Atlas 2007-11: The Breeding and Wintering Birds of Britain and Ireland(2013). The fieldwork led to any number of county and regional atlases to various parts of Britain and Ireland – a recent post on the Devon Bird Atlas 2007-2013prompted this look at bird atlases.
Dawn Balmer, the BTO’s head of surveys, guesses at least 60,000 volunteers have contributed in Britain and Ireland alone over the last 40 years, 40,000 on the most recent atlas. Some take holidays in remote places in order to fill gaps, some make expedition-like trips to remote islands, some embark on marathon mountain bike journeys to record birds in inaccessible parts of the Scottish Highlands.
She said: “The atlas only gets finished because people do amazing things. Every time there is a new atlas you are engaging people in citizen science… it is quite addictive, people become atlas addicts.”
By the turn of the 21st Century there were also British atlases to butterflies, moths, bryophytes, reptiles and amphibians, spiders, dragonflies, molluscs, leeches and ticks. Freshwater fish followed soon after, and after that fleas, the latter the product of a 50-year labour by schoolteacher and wartime Spitfire pilot Bob George.
All stemmed from the Atlas of the British flora, which perceptive contemporary reviewers recognised had a significance beyond the British Isles.
Grid-based dot-maps were promoted by the European Ornithological Atlas Committee, formed in 1971 – the idea of using grid squares, for many years a solely military pre-occupation, had originally come from the Netherlands.
Bird atlases for France and Denmark appeared in 1976. The first American bird atlas, to Vermont, was published in 1985; by 1990 all the Atlantic coastal states from Maine to Virginia had completed fieldwork for bird atlases.
At the last count there were more than 400 national or regional bird atlases from nearly 50 countries, the majority in Europe and North America. There were fewer covering Africa and the Pacific, where all but one come from Australia, and only a handful from Asia, the Middle East and South America.
The original Atlas of the British flora contained another gift: it included pre-1930 records – not as far away in time then as it appears to be now – of uncommon species as open circles and contemporary records as black dots, making it immediately clear many species were in decline.
A standout feature of the 1994 New Atlas of Breeding Birds in Britain and Ireland was a huge reduction in the breeding range of farmland birds since fieldwork for the earlier atlases had been done. The 2013 atlas revealed upland birds and wading birds – according to Balmer the extent of the latter’s problems came as a particular shock – were under far more pressure than previously recognised.
“It is about the bigger picture and you only get that from having these large scale surveys periodically,” Balmer said. “It really helps you identify species which are showing the greatest change over time and it can highlight groups that are real conservation challenges.”
With spring rapidly approaching, now is the ideal time to start thinking about nest boxes for your local birds. With this in mind we have put together some answers to the most frequently asked questions about nest boxes – covering where and when to put up your boxes, cleaning and maintenance as well as dealing with predators.
There really is no ‘best’ time to put up nest boxes. By putting up boxes in the autumn you can provide much needed winter refuges for roosting birds and increase the chance of them staying and nesting there when spring comes around. However, any box erected before the end of February stands a good chance of being occupied. Even after February there is still a chance that they will be used; tits have been known to move in during April and house martins as late as July. Therefore, put your nest box up as soon as it is available rather than leaving it in the shed!
Where should I hang my nest box?
When it comes to nest boxes, the ‘where’ is much more important than the ‘when’. Nest boxes must provide a safe, comfortable environment and protect the inhabitants from predators and the worst of the weather. This may be difficult to achieve; a safe location out of reach of predators may also be exposed to the weather, so have a good think before you start bashing nails in.
Nest boxes can be fixed to walls, trees or buildings and different styles of boxes are available which are suitable for each. Fixing to artificial surfaces means the growth of the tree does not have to be considered which is useful for Schwegler nest boxes which last for at least 20-25 years: a significant amount of time in the life of a small tree. If you’re planning any building work, remember that some bird and bat boxes can also be built directly into walls and roofs.
Locating boxes out of the reach of predators can be a challenge (weasels can climb almost anything), but there are things you can do to make it harder for them. Boxes in gardens should be located where cats cannot get to them and prickly or thorny bushes can also help to deter unwanted visitors. Some nest boxes also have anti-predator designs (e.g. Schwegler’s Tree Creeper nest box). It is best to avoid nest boxes that have a combined bird feeder and boxes should not be sited too close to the bird feeders in your garden. Visitors to the feeder may disturb the nesting birds and the feeder could attract unwanted attention from predators.
For many species the height of the box is not crucial. However, by placing it at least several metres off the ground you can help prevent predators and human interference. The direction of the entrance hole is also not too important but it is beneficial for there to be a clear flight path to the box. Crucially, the box should be sheltered from the prevailing wind, rain and strong sunlight, so in most UK gardens aim for an aspect of northerly, easterly or south-easterly. If possible, position the box with a slight downward angle to provide further protection from the rain. Wherever you position the box, try to ensure that you can still get access to it for maintenance. And finally, if possible, try to put it somewhere where you can see it so as to maximise your enjoyment of watching wild birds in your garden.
Is there anything else I can do to deter predators?
As already mentioned, location is the most important factor when trying to deter predators. Whilst some mammals can climb walls, a blank wall is fairly inaccessible so can be a good choice. Ensure that the box cannot be reached by a single jump from a nearby branch or the ground.
Box design can also help deter predators. An entrance hole reinforced with a metal plate will prevent grey squirrels and some avian predators from enlarging the hole and gaining access to the nest. Schwegler’s wood-concrete boxes are too hard for any predator to break through. However, you can also reinforce a nest box yourself with metal protection plates or provide additional protection with prickly twigs. Deep boxes may prevent predators reaching in and grabbing nest occupants, although some tits have been known to fill up deep boxes with copious quantities of nesting material. If using open-fronted nest boxes, a balloon of chicken wire over the entrance can work well. If you live in an urban area, cats are likely to be the most common predator. Gardeners have long since used various methods to exclude these unwanted visitors, such as pellets, electronic scarers and even lion dung (available from your nearest obliging zoo), all with varying degrees of success.
How do I manage the nest box?
A well-designed nest box will only need one annual clean in the autumn. It is important not to clean out nest boxes before August as they may still be occupied. Wait until autumn and then remove the contents, scattering them on the ground some way from the box to help prevent parasites re-infesting the nest box. Use a small brush or scraper to remove debris from the corners. Boiling water can be used to kill any parasites remaining in the box, but remember to leave the lid off for a while for it to try out. Do not wait until the winter to clean out nest boxes as birds may already be roosting in them.
How many nest boxes do I need?
The exact amount of boxes required will depend on the species and the surrounding habitat. As a very general rule of thumb, start with ten assorted small boxes per hectare (ensure uniform spacing between boxes). Keep adding several more boxes each season until some remain unused and hopefully you’ll hit on the correct density of boxes. However, even if you only have space for one box it is still worthwhile, providing it is suitably located. Many UK bird species need all the additional nesting habitat they can get.
If you are interested in installing a nest box camera into one of your bird boxes, take a look at our “How to choose a nest box camera” article, for more information on choosing the model that’s right for you.
Further information about individual nest boxes, including advice on positioning, can be found alongside each nest box in our range. If you have any other questions then please get in touch with customer services.
My Atlas of Breeding Birds in Devon has a pale blue cover, a black-and-white picture of a stonechat on the front, and a price tag of £1.50. It is more than 40 years old.
The atlas, based on fieldwork from five breeding seasons, spanning 1968 to 1972, was described, somewhat inevitably, as an ‘ornithological Domesday Book’, from which changes in the status of the county’s breeding birds could be measured.
So how does the data, published in 1974, measure up to the new Devon Bird Atlas, published this year?
Cuckoo and starling were recorded everywhere in the old atlas, yellowhammer everywhere except Lundy. All three are now missing from large parts of the county.
The skylark was abundant throughout Devon then. Today it is scarce or absent from large areas, mainly farmland.
The skylark’s modern strongholds are Dartmoor and Exmoor and the new atlas says: “If present trends continue… the glorious song-flight will become less and less familiar in intensively farmed areas.”
The plight of the lapwing is even more pronounced. In the old atlas it was a widely distributed breeding species, despite a decline that had been noted since the 1930s; the new atlas records lapwing breeding in only three places, two of them at the RSPB’s Exe estuary reserves, the other on the southern fringe of Dartmoor.
Grey partridge was recorded breeding almost everywhere in the old atlas; now it is confirmed in only two places.
Dr Humphrey Sitters edited the old atlas, and in the preface to the new one says more agri-environment schemes are needed, but will only be put into effect if people who know what is going on “present the data we have collected and batter the politicians and bureaucrats into submission.
“Therefore, ultimately, if we lose our breeding birds it is as much our fault as everyone else involved.”
Species whose numbers have increased include siskin, Dartford warbler, Cetti’s warbler and great crested grebe.
Cetti’s warbler was not in the old atlas, the first British breeding record is from Kent in 1973 – it may now be present at all suitable sites in Devon.
There was little evidence great crested grebe bred in Devon in the late 1960s and early 1970s. Numbers have since expanded, although it is doubtful more than 15 pairs successfully bred between 2007 and 2013, the years when data for the new atlas was collected.
The old atlas does not map where peregrine was breeding. During the fieldwork years only one or two pairs managed to rear young and the bird’s future, then blighted by pesticides and egg collectors, was too uncertain to risk identifying nests.
Today it is recorded as ‘possible, probable or confirmed’ almost everywhere, although in small numbers. Persecution is still with us, however, and the new atlas again tries to mask the actual nesting sites.
The sorriest story is possibly the curlew’s. It was breeding in more than half of Devon in the old atlas, although in small numbers – curlew had still not recovered from the historically cold winter of 1962/63, a trait then shared by many other species. Now breeding pairs are down to single figures, and the new atlas says the “future of the curlew as a breeding species in Devon looks bleak”.
The great landscape historian and great Devonian W.G. Hoskins described a Blackdown Hills parish, in the east of the county, as “a country of deep, winding lanes running from one ancient farmstead to another, haunted by buzzards in the valleys and by curlews on the heaths above, and full of flowers”.
The buzzards are still there but will we again be able to hear the curlew?
How did you become interested in working with vultures, and how did you come to be a part of this reintroduction project?
When I was a child I was interested to explore nature. At that time there was not much literature to find and to learn about nature. First I wanted to work on plants. Just around 1985 the first edition of the Red Data Book of Bulgaria was published and I tried to buy a copy and start studying the species. But when I had enough money from my parents and relatives around New Year’s Eve, I did not succeed to find the Volume I of the book- plants. I found after checking a lot of book stores in Sofia the Volume II- animals. It was only one copy of the book and part of it was missing (reptiles and amphibians), but the birds were there. I found that some of the rarest birds were the vultures and they were historically found in the area of my father’s birth town – Kotel. Here I started to wish to meet vultures in nature. After some time I became a member of Bulgaria Society for the Protection of Birds (BSPB) – now BirdLife Bulgaria – which was just established and was in charge of the conservation of last colony of griffon vultures in the country in the Eastern Rhodope Mountains. I was first a volunteer and later was working for the project for conservation of vultures in this area. Then I started to think about restoring the population in other sites in Bulgaria. I tried to organize feeding sites in other parts of the country where vultures historically were present, but this was not enough to restore the old colonies. Then I saw what was done in Massif Central in France by Michel Terrasse and his colleagues from FIR/LPO– namely reintroduction of griffon vulture through release of captive bred but also rehabilitated birds from Spain. Thus I decided that this should be done also in other parts of Bulgaria. BSPB were not very willing to work on reintroductions, which is why it was necessary to create a new NGO to work on reintroductions – Fund for Wild Flora and Fauna (FWFF) – created in 2000. Then I married Nadya Vangelova- and we went to live in her town – Blagoevgrad. The nearest historical place for vultures was Kresna Gorge (only 25 km away from the town) and it appeared it was still suitable for vultures, but they were gone extinct in the 1960s due to a mass and well organized state level poisoning campaign targeting terrestrial predators. Ten years later after the establishment of FWFF we succeed to implement the reintroduction of the species in Kresna Gorge, which is now presented in the current book.
Tell us about the Kresna Gorge in terms of biodiversity – what sort of place is it, and how do vultures fit into the ecosystem?
The Kresna Gorge is one of the very few places in Bulgaria with Mediterranean climate. This, in combination with steep slopes and rocky outcrops, makes the area very interesting for biodiversity. Some species of Bulgaria’s reptiles are found only here. Autochthonous loose forests of Juniperus excelsa were declared nature reserve and many southern species of birds are found here. In terms of vultures’ suitability, the area still has well preserved extensive livestock breeding and transhumance practice, where the herds are moved in the nearby high mountains Pirin and Rila, home to two of the three national Parks in Bulgaria. So it is the combination between deep valley with mild winters and high mountains with alpine pastures that makes the habitats suitable for vultures. Extensive livestock breeding and the presence of large carnivores like wolf and bear are additional benefits for the vultures. The last also poses a threat for the vultures, because the conflict between livestock breeders and carnivores some times leads to illegal poison baits use, which is the biggest threat for the vultures. We found that providing the feeding sites for vultures make it safer for them. Also, some people are concerned that it may be unnatural to feed vultures but because we dispose mainly of – although not only – food coming from the nearby villages, this makes the process rather natural.
Why was there a need to embark on a reintroduction process – how did the griffon vulture lose its place?
Since the beginning of the twentieth century the situation of the vultures of the Balkans and Europe became worse and worse based on extensive livestock breeding decline but mainly on direct persecution and non-deliberate poisoning. Not least the habitats changed especially in Bulgaria, where vast areas were reforested and thus the vultures no longer were able to search for and find food. In the 1960s nearly every available carcass for the vultures was poisoned and they went extinct from the entire country. In 1970 all large European vultures were considered extinct from the country. Only a small colony of less than 30 birds and 2-3 breeding pairs survived in Eastern Rhodope Mountains on the border with Greece. Although the conservation measures helped this colony to increase from 2-3 pairs to about 80 nowadays, the range of the species did not extend and still is only in Arda River Valley in Eastern Rhodopes. In the 1970s the large vultures were still surviving in Greece, but with time the bearded and griffon vultures have gone extinct from the mainland. The only black vulture colony in the Balkans is found in Dadia National Park in Greece close to the Bulgarian border. So we saw there is now suitable source of vultures where from they may recover naturally and that is why we decided to establish 5 new colonies – 4 to the north along the Balkan Mountain chain where we work in close cooperation with other NGOs such as Green Balkans and Bird of Prey Protection Society, and to the south west, Kresna Gorge. The last is also close to the small and declining population of the griffon vulture in FYR of Macedonia. But with the newly established colonies, it seems the situation gets a bit stabilized now. The summering, wintering and migrating birds on Balkans now have some more safe areas – read the book for the Reintroduction in Kresna Gorge to find how it works.
In short – if we want to have forests, wolves, but also vultures we have to reintroduce and organize feeding sites for them in our modern world dominated by man.
Reintroductions are quite a hot topic at the moment. One of the main concerns is finding accord between conservationists, landowners and the public regarding the benefits of such actions. Was this a problem for you in Bulgaria?
This is manageable. Especially with friendly species like the vultures it is a small concern for the local people in the very beginning and then they just appreciate the lovely and gorgeous birds flying high in the sky. The proper communication and involvement with local people is crucial for the success of any such initiative.
What are some of the major challenges the team faced during the years of the project?
The development of the network for receiving in-time information about livestock carcasses was very important and it took quite some time. Establishment of the first nucleus of griffon vultures also was a challenge. We did it twice until we found what the most important thing is. It was the food that should be provided not only in large quantity, but also at the best place for the vultures, and in summer to be provided frequently in small amounts so as not to decompose. We hardly learned that decomposed carcass is not an appreciated food source for vultures. They prefer fresh carcasses. Or at least not rotten meat. When we found that and made an effort to overcome it we saw the success.
Would you say that the process has been a success, then?
Yes, this is a success story. Of course we would like to see some more achievements in successful breeding and increase of the number of the breeding pairs of griffon vultures, as well as the return of the black and Egyptian vultures as breeders in the area. And one day also the return of the bearded vulture too.
Are there any lessons learned from this project that might have application for reintroduction practice in general?
There are two things: the vultures will not survive in the modern world without managing the carcass disposal. We could not have forests and wolves and also to have vultures just on their own. The last should be supported through feeding sites, at which the carcasses from the local villages and farms would be disposed and made accessible to vultures.
We developed a good method for individual identification of the vultures through so-called visual marking. We use cameras with long lenses and take pictures of every bird seen in flight. Then we compare the characteristics of the plumage. This way, even birds not marked with rings or wing-tags could be distinguished. The method is well described in the book.
If you could make one change to policy in Bulgaria, or beyond, that would be of benefit for vulture conservation, what would it be?
In the vultures’ range (either historical or current), where suitable habitats are still found, every natural or national park authority should be involved in maintenance of feeding site(s) for vultures. This should be one of the basic management practices for all protected areas that have an administration body. This way a large network (e.g Natura 2000 sites) of vulture safe areas will be established and the coherence of the habitat and space restored.
Some adaptations of the legislation concerning poisoning of wildlife and domestic cats and dogs should be done especially in Bulgaria. The use of poison baits in natural environment should be treated as an act of hunting. Nowadays the Bulgarian legislation does not treat the poison bait setting for dogs and cats. Only if a game species and/or protected species is affected the law could be applied.
How are the vultures doing today, and what are the next steps, for the project, and your own work with the Fund for Wild Flora and Fauna?
The vultures are preparing for the new breeding season. They are now making the very attractive simultaneous flights as breeding displays and seem very much enthusiastic especially in warm and windy days.
The next step is the reintroduction of the Eurasian black vulture, within the frame of the new Bright Future for Black Vulture in Bulgaria project LIFE14 NAT/BG/649, in cooperation with Green Balkans, Vulture Conservation Foundation, EuroNatur and the regional Government of Extremadura. I hope in future a similar story and a book will be issued for the black vulture in Kresna Gorge and Balkan Mountain in Bulgaria, where the species is now extinct for more than half a century.
I would like to mention here my colleagues and friends that work hard for all this to happen – Hristo Peshev, Lachezar Bonchev, Atanas Grozdanov, Nadya Vangelova and Yavor Iliev.
Deciding which nest box camera to choose involves a complicated tiptoe through competing technologies and equipment. Before you start watching birds you have to decide what sort of system is best for you and, crucially, how much money to spend.
The first question you need to consider is whether to choose a wired or wireless system.
Wired systems have a cable running from the nest box back to your house or classroom, which carries both power and the television signal. This results in excellent image quality but may not be ideal if you have children or pets in your garden, or if a cable running to your bird box will interfere with the gardening. You will also need to feed the cable into your house, either by drilling a hole in the wall or by feeding it through an open window.
Wireless systems do not require a cable to run between the bird box and the television but instead transmit images to a small receiver situated inside the house. However, a power supply will still be required for the camera (i.e. from a shed or outbuilding) and the signal can be compromised by other wireless devices in the area or by trees and other structures between the nest box and the house.
Next you will need to consider whether you require a complete kit or just the camera.
If you are new to this particular aspect of watching and listening to birds, a complete kit, such as the Nest Box Camera Starter Kit is a good and economical choice. This starter kit includes a bird box with a camera mounted in the roof, which provides colour footage during the day and black and white at night. A 30 metre cable plugs into your television and supplies the camera with power. Another option is the Gardenature Nest Box Camera System, which includes a bespoke red cedar nest box made to RSPB and BTO guidelines. A small sliding drawer at the top of the box houses the Sony CCD camera, which adjusts automatically depending on light levels. A 30 metre cable connects the camera to your television.
For the handyman or woman who wants to put a system together themselves, either in a bespoke or existing nest box, the Nest Box Camera with Night Vision is a good choice. The tiny camera will focus from a few centimetres to roughly 30 metres, with high definition for excellent daytime and night time images. The camera comes with a 30 metre cable and extension cables are available to purchase separately. The Wireless Nest Box Camera Kit is a great option if you want to fit a wireless camera to your own bird box.
What about watching on your computer?
All of the cameras and kits that we sell come with either a cable or wireless receiver that will connect directly to your television. If you want to view or save your footage onto your computer then an additional USB capture device is required. These are available both for Windows and Mac operating systems and come with all the software you require to get started.
A good pair of binoculars are invaluable for identifying all sorts of animals at a distance and are a fantastic addition to the naturalist’s field kit. However, there are many different makes and models available, all with different specifications, and choosing a pair can be confusing. In this post we will take a look at the anatomy of a pair of binoculars and explain the things you need to know in order to make an informed decision about which binoculars are right for you.
Binocular models generally have two numbers in their description. The first of these relates to the magnification. (For example, 8 x 42 binoculars will have a magnification of 8x). In general, binoculars have a magnification between 8x and 12x. As you would expect, the higher the magnification, the larger objects will appear when looking through them. As magnification increases the field of view is reduced, although higher quality models maintain a good field of view even at higher magnifications. You will also need to hold your binoculars steady with higher magnifications as hand shake will have a greater effect.
The second number in the binocular model description (e.g. 8 x 42) refers to the diameter of the objective lens. Standard size binoculars tend to have objective lenses of 32mm to 42mm whilst lenses in compact binoculars usually measure 25mm. Larger lenses can dramatically improve low light performance and are particularly good for use at dusk or dawn. The trade off is that larger lenses are heavier.
There are two main styles of binocular: Porro Prism and Roof Prism. Porro prism binoculars have widely separated objective lenses which are further apart than the eyepiece (ocular) lenses. This gives them a “dog-leg” like appearance. Roof Prism binoculars have objective and eyepiece lenses which are in line with one another, resulting in a more streamlined and compact instrument. Traditionally, roof prism binoculars would produce an image that was less bright than that of an equivalent porro prism model, due to reduced light transmission. However, modern binoculars, particularly high quality ones, have remedied this problem through innovations in lens coatings. All of the binoculars sold by NHBS are of the roof prism style.
The type of glass used to manufacture the lenses can vastly affect the quality of the image. Two types of glass to look out for are extra-low dispersion (ED) and fluoride (FL) glass. These reduce chromatic aberrations giving clearer and sharper colours and reduced colour “fringing”. (Fringing is the blurring that can occur between light and dark parts of an image).
Lens and Prism Coatings
Lens coatings reduce the amount of light that is lost between the objective and the eye (ocular) lens helping to produce a brighter and sharper image. Lenses which are multi-coated have multiple layers of lens coatings. High quality binoculars are fully multi-coated which means that they have multiple layers of coating on all lens surfaces.
Roof Prism binoculars have a particular problem with “phase shift” where the polarisation angle of the prism causes the light passing through to be split into two slightly out of phase beams. This results in an image which has lower resolution and may look slightly blurred. Prism coatings correct this problem by forcing the split light back into phase. Look out for binoculars with Phase Correction (PC) prism coatings.
Other Key Comparison Features
As well as the physical characteristics of the binoculars discussed above, there are a number of other specifications which you might want to consider.
Field of View – The field of view is how wide an image can be seen at a specified distance (usually 1000m). A wide field of view is useful for large landscapes and for fast moving animals.
Close focus – The close focus is the minimum distance at which the binoculars are able to focus. People interested in viewing insects using their binoculars would be advised to choose a model with as small a close focus as possible.
Eye relief – This is the maximum distance from the eyepiece lens that the eye can be positioned at which the full width of the image is visible without vignetting (darkening of the image around the edges). Longer eye relief is useful for those who wear glasses.
Weight – The weight of the binoculars is incredibly important, as it is likely that you will be carrying them around for long periods. Higher quality models of comparable specification will tend to be lighter than more entry-level models, and those with larger objective lenses will weigh more than those with smaller ones.
Price – Although we have mentioned this last, your budget will most likely be one of the key things to consider when choosing binoculars. Entry level models such as the Hawke Optics Vantage or Opticron Oregon 4 LE are great value for money and ideal for the beginner or infrequent user. However, if you are using your binoculars in a professional capacity or will be looking through them for a considerable amount of time each day, then choosing something of higher quality will be beneficial. Top of the range models such as the Zeiss Victory and Swarovski EL produce a superb quality image and can be used continuously for many hours without causing severe eye strain. They also come with the assurance of 10 year warranty. For most users, there will be a model in between these two extremes that will be perfect for you and your budget.
The NHBS Binocular Range
At NHBS we stock a large range of binoculars made by Minox, Hawke Optics, Opticron, Nikon, Zeiss and Swarovski. These range from economical and compact models up to full size, top of the range varieties. All of the models we sell have a roof prism design, come with a case and neckstrap and are waterproof.
Still unsure about which binoculars you need? Contact us on +44 (0)1803 865913 or email email@example.com for some advice.