Ornithology – Page 4 – Hoopoe

The Big Garden Birdwatch: NHBS Staff Results 2023

We have reached the end of the 44th Big Garden Birdwatch, which took place between 27th and 29th January. Run by the RSPB, this is one of the largest citizen science surveys in the UK and encourages the public to observe and record the birds in their garden over a period of one hour. In 2022, more than 700,000 people took part recording over 11 million birds. This huge amount of data allows the RSPB to create a comprehensive picture of how our local birds are faring, and to examine changes in both abundance and distribution over time.

If you took part over the weekend, there’s still time to submit your results on the RSPB website. The final date to let them know what you saw is 19th February. Don’t forget, even if you didn’t see anything, it’s still useful information. (If you can’t submit your results online, you can print off the form from the free guide and send it by post).

Even though the Big Garden Birdwatch is over this year, there are still lots of important things you can do to make your garden attractive to birds and other wildlife. Private and public green spaces in the UK cover an area three times bigger than all of the RSPB nature reserves combined, so making these spaces wildlife-friendly is hugely important and significant. Remember to keep putting out fresh food and water for your garden birds, and always remember to keep your feeders, bird tables and bird baths free from disease by cleaning them weekly. See the RSPB website for some helpful information on preventing disease, and check out this great guide from the Wildlife Trusts on cleaning bird feeders and nest boxes.

As always, many of our staff got involved with the Big Garden Birdwatch this year. Scroll down to see what we found and to see some of our pictures. We’d also love to see what you’ve spotted if you took part – let us know in the comments below.

Results

Sabine saw:

Woodpigeon: 2
Robin: 2
Great Tit: 1
Chaffinch: 2
House Sparrow: 1
Magpie: 1
Common Pheasant (male): 1

Catherine saw:

Starlings: 6
Blackbird: 1

Elle saw:

Woodpigeon: 1
Robin: 1
Blackbird: 1

Oliver saw:

Woodpigeon: 2
Blackbird: 3
Dunnock: 1
Long-tailed tit: 1
Jackdaw: 1

Luanne saw:

House Sparrow: 5
Robin: 1
Blackbird: 2
Magpie: 2
Woodpigeon: 3

The RSPB

For more information on UK garden birds, the Big Garden Birdwatch and how you can help them, please visit www.rspb.org.uk. Here you will find a wealth of information to help you find and identify UK bird species.

The RSPB Big Garden Birdwatch 2023

Long-tailed tit on peanut feeder. Image by Conall via Flickr.

For the past 44 years the RSPB has been running one of the largest citizen science projects in the world, the Big Garden Birdwatch. Each year in January, more than half a million people take to their gardens, parks and balconies to count the birds they see. This huge dataset has allowed the RSPB to create a comprehensive picture of how our local birds are faring, and to examine changes in both abundance and distribution over this time.

Anyone can sign up to take part, and you don’t need to be a member of the RSPB. All it takes is an hour of your time. This year’s Big Garden Birdwatch will take place from 27th to 29th January, with results expected to be published in April.

How to take part in the Big Garden Birdwatch

Sign up on the RSPB website and download the free guide and ID chart.
Find a good spot to watch the birds in your garden or a local park and choose an hour between between Saturday 27th and Monday 29th January.
Have fun identifying the species visiting your garden during that hour and count the maximum number of each species you see at any one time. For example, if you see a group of three house sparrows together and after that another one, the number to submit is three. This method means it is less likely you will count the same birds more than once and makes data analysis easier. Make a note of any other wildlife that you spot as well.
Submit your results on the Big Garden Birdwatch website. Even if you don’t see anything, that’s still useful information. (If you can’t submit your results online, you can print off the form from the free guide and send it by post).
Join in the conversation on RSPB social channels throughout the weekend to see what other nature lovers are spotting across the UK and upload your own pictures and comments using #BigGardenBirdWatch
Look out for the results in April and take pride in having contributed data from your patch.

What did we learn in the 2022 Big Garden Birdwatch?

In 2022, almost 700 thousand people took part in the Big Garden Birdwatch, submitting records of more than 11 million birds. The most frequently reported species was the house sparrow which received 1.7 million sightings. The second and third spots were held by blue tits and starlings respectively.

Other notable changes include a huge increase in jay sightings, up 73% from 2021. This increase was potentially due to an increase in food availability as 2021 was a notoriously poor year for acorns. A small increase in greenfinch numbers also provided cause for hope. This species has declined by 62% since 1993 due to an outbreak of trichomonosis which is spread through contaminated food and water. It is hoped that this increase in numbers represents the first signs of a recovering population. Results from this year’s Birdwatch will help to give a better picture of how they are faring.

How can I encourage more birds and other wildlife to my garden?

Participating in the Big Garden Birdwatch is the perfect opportunity to observe how wildlife is using your garden and to give you some insights into how you could make your outdoor space even more attractive to wildlife.

Improving your garden for wildlife can be as simple as leaving a patch of long grass; providing native trees or plants that are good for pollinators such as lavender, buddleja and verbena; or leaving a woodpile for insects to shelter in. You can also supply nest boxes for birds, bat boxes for summer roosting bats, access panels and shelters for hedgehogs, shelter for frogs and toads, and of course bird feeders, which will bring a multitude of species to your garden.

Recommended books

Collins Bird Guide: The Most Complete Guide to the Birds of Britain and Europe

With expanded text and additional colour illustrations, the third edition of the hugely successful Collins Bird Guide is a must for every birdwatcher. The combination of definitive text, up-to-date distribution maps and superb illustrations makes this book the ultimate field guide, essential for every birdwatcher and field trip.

Europe’s Birds: An Identification Guide

Covering more than 900 species, and illustrated with over 4,700 photographs, this is the most comprehensive, authoritative and ambitious single-volume photographic guide to Europe’s birds ever produced. The images are stunning to look at, making this a beautiful book to enjoy, as well as an up-to-date and essential source of identification knowledge.

Britain’s Birds: An Identification Guide to the Birds of Great Britain and Ireland

A bestselling guide since it was first published, Britain’s Birds has quickly established itself as the go-to photographic identification guide to the birds of Great Britain and Ireland – the most comprehensive, up-to-date, practical and user-friendly book of its kind. Acclaimed by birdwatchers of all kinds, from the beginner to the most experienced.

Park and Garden Birds

This newly updated fold-out guide covers the top 50 birds of gardens and parks, including ponds and rivers. Designed for speedy bird identification with living birds in the garden, the guide features beautiful colour paintings by Chris Shields. Accompanying text on the reverse side covers body size, food, key identification notes and conservation status.

RSPB Guide to Birdsong

Birdsong is one of the greatest and most accessible wildlife pleasures that people can experience, even in urban areas. This beautiful, full-colour book and narrated CD of brand new recordings will help people to learn about the sounds and calls of the commonest birds in Britain, and reveal when and why birds make these sounds.

The NHBS Guide to UK Rails

Rails, from the family Rallidae, are small- to medium-sized birds and include crakes, coots and gallinules. They can be found in most terrestrial habitats, but the most common are marshland and dense forests. They are present on every continent except Antarctica and are generally omnivores, consuming invertebrates, fruits and seedlings. Typically, they prefer dense vegetation near bodies of water, such as lakes, rivers or swamps.

This is a large family with around 130 species. We have several resident species in the UK, as well as a number of migrants and occasional visitors. Identification of rail species relies on plumage, leg and frontal shield colouration (if present), and their calls. Binoculars and scopes are useful for spotting these features from a distance. Juveniles and chicks will often differ in appearance from adults, therefore a guide covering these life stages is also helpful.

How are rails faring?

Due to hunting, egg collection and habitat loss, many rail species have become extinct and others are endangered. The corncrake and the spotted crake, for example, are classified as Red and Amber under the Birds of Conservation Concern 4. Due to their general flightlessness, they are often heavily impacted by introduced species such as domestic cats. American mink, a nonnative and invasive species in the UK, are a particular threat to moorhen as they can be a main prey item.

Corncrakes are the focus of several conservation projects due to their Europe-wide population declines. Research has shown that increasing the areas of suitable tall vegetation, particularly in spring, autumn and mid-winter, delaying mowing and using certain mowing methods can be effective conservation measures. Up to 60% of chicks are killed by standard mowing practices, due to their flightlessness and reluctance to escape to areas already cut. Since 1992, conservation measures have been implemented on a large scale and have resulted in a partial recovery, from 480 calling males in 1993 in the UK to 1,284 in 2014. However, since 2014, numbers are declining again in Scotland, down by 30% to 870 males in 2019.

Eurasian Coot (Fulica atra)

Distribution: Widespread in England and Wales, rarer in Scotland and Ireland. Numbers are boosted by migrants during winter.
BoCC4 status: Green
Wingspan: 70–80cm
What to look for: The coot is an all-black bird with a distinctive white bill and ‘shield’ on its forehead. They have yellow and white legs with large white feet that have lobed flaps of skin, which act similarly to webbed feet to aid their swimming.

Moorhen (Gallinula chloropus)

Distribution: Widespread in England, Wales, and Ireland, but less common in Scotland.
BoCC4 status: Amber
Wingspan: 50–55cm
What to look for: Moorhens have a similar appearance to the Eurasian coot, with a blackish plumage, which, when viewed close up, is actually dark brown on its back and wings with a bluer underside. However, they have a red and yellow bill, long green legs and white stripes on their flanks

Corncrake (Crex crex)

Distribution: Scarce summer breeding population, recorded in the Western Isles, coastal parts of northern Scotland, parts of Ireland and a few key areas in England.
BoCC4 status: Red
Wingspan: 46–53cm
What to look for: Corncrakes are small birds, slightly larger than a blackbird, with chestnut and dark brown wings and back, a mottled grey to buff underside and reddish-brown and white flanks. Its head is grey, with chestnut eyestripes and a chestnut and dark brown crown. Its legs and bill are pale pink.

Spotted Crake (Porzana porzana)

Distribution: Scarce, scattered pairs across Scotland and England.
BoCC4 status: Amber
Wingspan: 37–42cm
What to look for: The spotted crake is similar to the corncrake, with chestnut and dark brown wings and back and a greyer underside, but this species is speckled with white throughout and has a buff undertail. It has a similar grey head, chestnut and dark brown crown and chestnut eyestripe. Its legs are yellowish-green and its bill is a mix of orange, yellow and grey.

Water Rail (Rallus aquaticus)

Distribution: Widespread but thinly distributed throughout England, parts of Wales and Ireland. More scarce in Scotland and absent from upland areas.
BoCC4 status: Green
Wingspan: 38–45cm
What to look for: Their back and wings are chestnut and dark brown, with a grey underside and face. They have black-and-white barred flanks, a chestnut and dark brown crown, a long, red bill with a darker upper part and greyish-pink legs.

Sora (Porzana carolina)

Distribution: Occasional visitors, small number of records around England.
Global status: Least concern
Wingspan: 38cm
What to look for: The sora has a brown back marked with small black and white lines, a blue-grey underside and face, a short yellow bill with black markings at the base and yellow legs. Their flanks are barred with white and black.

Recommended books and equipment

The Corncrake: An Ecology of an Enigma

The detailed ecology of the corncrake, including many important facts about its lifestyle and behaviour, remains mysterious, even among ornithologists. This is the first full-length book to capture all the aspects of corncrake ecology and present this information to non-specialists.

Collins Bird Guide: The Most Complete Guide to the Birds of Britain and Europe

With expanded text and additional colour illustrations, the third edition of the hugely successful Collins Bird Guide is a must for every birdwatcher. The new edition has an extra 32 pages allowing several groups more space and completely or partly new plates with more detailed text.

Britain’s Birds: An Identification Guide to the Birds of Great Britain and Ireland

A bestselling guide since it was first published, Britain’s Birds has quickly established itself as the go-to photographic identification guide – the most comprehensive, up-to-date, practical and user-friendly book of its kind. Acclaimed by birdwatchers of all kinds, from the beginner to the most experienced, the guide has now been thoroughly revised and updated to make it even better than before.

Rite in the Rain Side Spiral Notebook (Small)

This is an environmentally responsible, all-weather paper which will survive anything from torrential rain to extreme heat and humidity. Perfect for making notes when birdwatching.

Kowa TSN-500 Series Compact Spotting Scope

Durable, lightweight and with excellent image quality, the TSN-500 series 20-40x spotting scopes are ideal for beginners or experienced birders looking for a portable alternative to heavier scopes.

Opticron Discovery WP PC Binoculars

These have an ultra-compact design to make them among the smallest waterproof roof prism binoculars available on the market today. Great for travelling and fantastic for children as young as seven.

Bird-Spot Laser Pointer

This is a pocket-sized green laser designed for use on birding trips. Its green beam will allow you to easily point out the location of a bird to fellow observers whilst remaining safe for both the birds and the user.

Please see nhbs.com for up to date pricing and availability.

A Short History of the Collins Bird Guide

The third edition of the popular Collins Bird Guide has arrived! With this newly published edition, we decided to take a brief look at how this highly regarded field guide came about.

Illustrated bird guides have been around in one form or another since the turn of the 20th century. It wasn’t until the post-war years, however, that they began to gain popularity, and birdwatching as a pastime became increasingly common both in the UK and farther afield. At this point, illustrated identification guides became much more available on the mass market and were no longer affordable only to the wealthier classes.

Between the 1960s and 1990s, three field guides dominated the scene in Britain and Europe: Fitter and Richardson’s Collins Pocket Guide to British Birds, Lars Jonsson’s Birds of Europe with Africa and the Middle East and Peterson, Mountford and Hollom’s A Field Guide to the Birds of Britain and Europe. But although these books were widely used, there was an appetite among publishers for the creation of a new, definitive field guide.

In 1986, well respected identification experts Peter Grant and Lars Svensson came together to begin working on just such a thing. To illustrate the book they recruited artist Killian Mullarney from Ireland, whose painstakingly detailed work was conducted from first-hand field experience, lending it a lively and lifelike quality. Creating artwork in this way, however, proved to be a slow process, and even with the addition of another illustrator- Dan Zetterström – the book was 13 years in the making. Unfortunately, Peter Grant died in 1990, some time before its eventual publication in 1999, so he never got to see the final result.

The quality of the artwork in the Collins Bird Guide is widely regarded as the best that has ever been seen. Even with contributions from two artists, there is an unparalleled uniformity in style, and the ‘jizz’ of the birds are captured beautifully alongside their more objective characteristics. Including illustrations of the birds featured in their natural habitats in order to assist with identification was another brilliant feature.

The book also differed from previous field guides in the clever and user-friendly layout of the pages. For the first time, all of the images and text for a species were arranged on a single spread – an obvious benefit when using the book in the field. Species were also arranged taxonomically, unlike many earlier books in which birds were grouped together based on their appearance.

The second edition of the Collins Bird Guide was published in 2010 to reflect new and revised taxonomy, and included both expanded text and additional illustrations. The third and most recent edition has now been published in hardback, with the paperback to follow in 2023. It is the opinion of many that ornithological field guides to Britain and Europe will never surpass the Collins Bird Guide in quality and scope – indeed, more than 20 years after its initial publication, it remains a stalwart member of most birdwatchers’ bookshelves.

The third edition of the Collins Bird Guide has now been published (hardback only, paperback to follow in 2023).

Universal nest bricks

Many UK bird populations have shown a dramatic decline since the 1970s and 80s, with species such as starlings (Sturnus vulgaris), house sparrows (Passer domesticus) and swifts (Apus apus) declining by over 50%. This is thought to be due to changes in land use and agricultural practices impacting food supply and the availability of suitable habitats. Changes in architecture have meant a reduction in important nooks and crannies that are utilised as nesting sites by species such as swifts, reducing reproduction rates in urban areas.

Providing suitable nest boxes has been shown to help increase reproduction rates for many species, helping to boost populations. Stephen Fitt and Mike Priaulx, members of the Swifts Local Network: Swifts and Planning Group, discuss the concept of ‘universal’ bricks, the British Standard key requirements on the inclusion of nest boxes within housing developments and current calls for a more specific national policy regarding these features.

Universal nest bricks

A British Standard BS 42021:2022 for integral nest boxes was published in March 2022. This sets out requirements for numbers, location, dimensions, materials, entrance hole size, and an administrative process to demonstrate implementation on site. This will enable integral nest boxes to provide nest spaces for a wide variety of species, such as house sparrows, starlings, swifts, house martins, and blue and great tits.

The standard also covers nest cups for house martins and swallows.

House martin using a Schwegler swift brick by Hugh Hastings and the Duchy of Cornwall

Some species-specific integral nest boxes are quite inflexible. Sparrow terraces, for example, are rarely fully occupied and are unpopular with other species. Deep nest bricks, such as those designed specifically for starlings, could cause a swift to become trapped within it.

Although swift bricks were designed initially to allow swifts to nest, these are now considered a ‘universal’ nest brick as set out in the NHBC Foundation report: Biodiversity in new housing developments: creating wildlife-friendly communities (April 2021). Section 8.1 Nest sites for birds (page 42) states: “Provision of integral nest sites for swifts is through hollow chambers fitted into the fabric of a building while in construction. Although targeting swifts they will also be used by house sparrows, tits and starlings so are considered a ‘universal brick’.”

Swift by Simon Stirrup (Cambridge Bird Club)

The British Standard sets out key requirements for integral boxes as follows:

The number of integral boxes in housing developments – at least one per residential unit on average.
The numbers of the above installed in larger buildings – to be proportionate to the mass and design; there is not necessarily an upper limit.
In all but exceptional circumstances the entrance holes of all integral boxes should be 30mm x 65mm minimum to enable starlings to enter.
The entrance hole should be located close to the base of the box to avoid birds becoming trapped within.

This ‘universal’ nest brick concept has also been described in an article by CIEEM, which references a January 2022 paper on this subject by the Swifts Local Network (SLN).

Local policy legislation has also begun to recognise this line of thinking, for example the Westminster Environment Sustainable Planning Document (February 2022), which in particular calls for: “‘swift bricks’ within external walls…Swift bricks’ are also used by house sparrows and other small bird species so are considered a ‘universal brick’. Integrated nesting bricks are preferred to external boxes for reasons of longevity, reduced maintenance, better temperature regulation, and aesthetic integration with the building design” (Species and Habitats, page 49).

The results from Duchy of Cornwall monitoring programmes confirm that by installing high numbers (an average of one per residential unit) of “‘swift/universal boxes’ in new-build developments, approximately 50% showed signs of occupation after five years, so it is highly likely that they will all be used during the lifetime of the building(s) they are situated in.”

Swift chicks inside a ‘universal brick’. Image by Dick Newell.

Many conservationists would like to see either a numerical value in the Biodiversity Net Gain methodology for these features for wildlife, or a separate strand to the national policy requiring these to be specified. The BREEAM environmental assessment has been following a similar approach for more than a decade.

Such features are already demanded by specific policies in some Local Plans, but other plans are still being published with no such requirements.

CIEEM highlight in the June 2019 issue of their In Practice journal the value of swift bricks to a wide range of small bird species, and provide readily available best practice guidance on the implementation of the bricks, including a recommendation for one nest space per dwelling on average (in accordance with the BS 42021:2022, and following on from RIBA guidance Designing for Biodiversity published back in 2013). While some local authorities such as Brighton are implementing this guidance, others rely on numbers derived from ecologists’ and planning officers’ advice, which can be very variable.

Some developers, Taylor Wimpey being one example, are publishing their own policies for biodiversity measures such as the installation of integral nest bricks.

Defra are developing a simplified Small Sites Metric for Biodiversity Net Gain, and the consultation on this held during autumn 2021 may provide a glimpse of the future as it asks about including a value for bird and bat boxes in the metric, although this has not appeared in practice as yet.

To find out about the swift nest boxes we sell at NHBS, check out our website.

Owl Pellet Dissection

Owl pellets contain all of the indigestible parts of the prey. Image by Gail Hampshire via Flickr.

What is an owl pellet?

Owls feed on a variety of prey; most commonly small mammals but also birds, frogs and other small animals. These prey items are consumed in their entirety and, while the flesh is digested by enzymes, the owl is unable to digest the harder parts of the body, including the teeth, bones, fur or feathers. These indigestible parts are regurgitated as a pellet. Unless they are very fresh, pellets are dry, light and odourless.

In this article we will look at where to find owl pellets and how to tell which species of owl they came from. We will also provide some tips on how to dissect a pellet, how to group the bones into types, and how to identify some of the main species of small mammal that you will find in pellets in the UK.

Where to find owl pellets

Owl pellets can frequently be found wherever owls nest or roost. Good places to search are at the base of tall trees within woodland areas, or in barns or outbuildings where owls are known to roost. Please be aware that you must not disturb breeding or roosting owls in order to collect pellets. Barn Owls in particular are protected in the UK by law under the Wildlife & Countryside Act 1981 and their breeding sites must not be disturbed under any circumstances.

If you don’t have any luck finding your own pellets or don’t have access to places where you might find them, there are several places online where you can order some. Reputable sources in the UK include the Barn Owl Trust and the Suffolk Owl Sanctuary.

What species of owl is my pellet from?

There are five resident species of owl in the UK: Barn Owl, Tawny Owl, Little Owl, Short-Eared Owl and Long-Eared Owl. All of these species produce pellets that are relatively easy to tell apart, particularly if you also know the habitat where they were found. Below is a brief guide to their main characteristics.

• Barn Owl: pellets usually measure 3-7cm in length and are rounded at both ends. They are fairly dark in colour and have a smooth surface.
• Tawny Owl: pellets measure 2-5cm in length and are narrow and bumpy, often having tapered ends. Greyish in colour and sometimes furry looking.
• Little Owl: pellets are fairly small measuring only 1.5-2cm in length. Long and narrow with a soft crumbly texture.
• Short-Eared Owl: pellets are fairly large, measuring 3-6cm in length. Narrow with one rounded end and one tapered end. They are grey and smooth and very lightweight.
• Long-Eared Owl: pellets measure around 2-4cm and are narrow and bumpy. Usually grey in colour.

The most common pellets you will find in the UK are from Barn Owls.

Barn Owl pellet with mounted needle and fine pointed forceps.

How to dissect an owl pellet

There isn’t much equipment you need to dissect an owl pellet, but a few items will make the job a bit easier:

• Mounted needle: this is useful for teasing out fur from around the bones, and moving around delicate specimens. A cocktail stick or needle pushed into a cork will also do the trick.
• Forceps/tweezers: helpful for picking up bones and particularly for removing fur from inside skulls. Forceps with a fine point are best.
• Magnifying glass/hand lens: a small magnifier will allow you to get a closer look at the bones that you find. Jaw bones in particular are very useful for identifying the species and a magnifier will help you get a better look at the arrangement and structure of the teeth.
• White paper/card and glue: it can be helpful to arrange your bones by type onto a sheet of white paper which you can then write on when you have decided what they are and who they belong to. If you would like to make a permanent ID aid you can also glue them onto a piece of card and add permanent labels.

How to identify the contents of an owl pellet

The first thing you will need to do is to tease apart the pellet and separate the bones from the fur and feathers that are holding it all together. To begin with it is easiest to gently break the pellet into several smaller sections then work on each of these in turn. Use your fingers as well as the forceps to carefully tease apart each section, removing any bones and placing them to one side for identification. If your pellet is very hard and dry, try soaking it in water first to soften it.

Once you have all of the bones from your owl pellet, try to group them into types on your sheet of paper. The most common bones you will find are the following:

Skulls: for mammals, this consists of the top part of the skull and upper jaw, along with the lower jaw, although this is likely to become detached once you have cleaned all of the fur and other material from inside. For bird species this will include the upper and lower parts of the beak.
Back legs: includes the thigh bone (femur) and the lower leg bones (fibula and tibia)
Front legs (arms or wings): includes both upper (humerus) and lower (radius and ulna) bones
Hip bones
Shoulder blades (scapula)
Back bones (vertebrae)
Ribs

The image below illustrates typical examples of each type of bone. You can also download a useful bone identification sheet from the Suffolk Owl Sanctuary website.

The most useful part of the skeleton for identification is the skull and jaws or beak. Bird skulls will obviously be very distinct from those of mammals due to the presence of the beak, so these can immediately be separated out. For the remaining mammal skulls, however, we will need to take a closer look at their lower jaw bones and teeth.

In the UK the most common small mammals you will find in owl pellets are voles, mice and shrews. It is very easy to distinguish which of the lower jaws belong to shrews as they have a continuous line of teeth from the front to the back of the jaw. This is because shrews are insectivores and chew their food, much the same as we do. Voles and mice, however, both gnaw their food, and have a big gap between the long front tooth and the back teeth.

To tell the difference between voles and shrews, we need to take a closer look at their back teeth. Voles have teeth with distinctive grooves down the sides. In those of a field vole, the grooves run all the way down the side of the tooth. There is also no obvious root. Bank voles have grooves which only run part-way down the side of the tooth and they have two obvious roots, similar to those of a human tooth. The back tooth from a mouse jaw is much smaller when compared to a vole and its structure is much more similar to that of a human tooth. It also has two roots. This sheet from the Barn Owl Trust has a great illustration of the various small mammal lower jaws with size guidelines to help with identification.

Hopefully this article has been a useful introduction to owl pellet dissection and the identification of some of the most common prey species contained within them. If you want more help with identifying all of the bones in your pellet down to species level, the guides listed below are invaluable. Once you have categorised all of the bones you can attach them to a piece of card with permanent labels or arrange them to create a complete skeleton of each species.

Finally, don’t forget to wash your hands well when you have finished your dissection. Any pellet remains can be safely composted.

Robert Gillmor Obituary

Robert Gillmor 1936–2022

We have recently received the sad news of the passing of Robert Gillmor, a leading ornithologist and author, and one of Britain’s most popular and loved wildlife artists.

Born in 1936, Gillmor’s illustrations were first published in the monthly magazine British Birds when he was just 16. Since then, he illustrated more than 100 books, as well as producing several of his own collections, including Cutting Away in 2006, Birds, Blocks And Stamps in 2011, and Pressing On: A Decade of New Linocuts in 2018. Notably, he was the artist behind the original Avocet drawings used for the RSPB logo and the Sacred Ibis in the British Ornithologists Union (BOU) logo. His artwork has also appeared in journals, calendars, greetings cards and posters. In 2015, Gillmor received an MBE for his services to wildlife art.

Gillmor also designed over seventy of the covers for the New Naturalist series, bringing to life a variety of titles including Farming and Birds; Beetles; Garden Birds; British Warblers, his first cover; and his 72nd, Ecology and Natural History. In 2011, Royal Mail commissioned Gillmor to illustrate a set of Post & Go Birds of Britain stamps. He created 46 designs over three years and the profits from the sale of the original linocuts were donated to the Norfolk Wildlife Trust.

Robert Gillmor was one of the founding members of the Society of Wildlife Artists, an organisation founded in 1964 seeking to encourage appreciation of the natural world through fine art inspired by wildlife. SWLA strives to promote awareness of the importance of conservation through exhibitions and publications, while also supporting young artists that are eager to develop their knowledge and skills in wildlife art.

Gillmor was a keen ornithologist, serving on the council of three national organisations: RSPB, BOU and the British Trust for Ornithology. Due to his contributions to ornithology and bird conservation, he received the highest awards from all three societies. He also had a leading role in the promotion of the British Birdwatching Fair (Birdfair), an annual event whose organisers donated all of their profits to Birdlife International, and designed many of the event’s iconic posters.

Robert Gillmor: 6th July 1936–8th May 2022

The NHBS Guide to Swifts, Swallows and Martins Identification

Swifts, swallows and martins are migratory birds, spending the winters in Africa before flying around 3,400 miles to spend summer in the UK. While they are here they spend their days soaring high and feasting on the abundance of flying insects. Their arrival, for many of us, marks the end of winter and announces the arrival of spring and summer.

Although swifts, swallows and martins share some characteristics, they are, upon closer inspection, markedly different. They are roughly similar in size and shape, which can make them difficult to discern between, especially when flying high in the sky. However, as you begin to look closely at their appearance, flight, nesting behaviour and other key characteristics, it is relatively easy to distinguish between them.

Below we share our top tips for identifying swifts, swallows and martins. In this article we have focused on the below species as they are all common and widespread in the UK:

Common swift (Apus apus)
Barn swallow (Hirundo rustica)
Common house martin (Delichon urbicum)
Sand martin (Riparia riparia)

How to identify swifts

Swifts are amazing birds – they are the longest continually-flying species, spending up to 10 months in the air without landing. They eat, drink, sleep, and mate while flying, only landing to breed. They are almost never seen perching.

Key identification features:

Crescent-shaped, long, curving wings
Forked tail which is much shorter and stouter than the tail of a swallow
Dark brown all over with a small pale patch on their throat, but often appear black against the sky
Screaming piercing call

When to spot them in the UK: April to September

How to identify swallows

Image by Vincent van Zalinge via Unsplash

Swallows are small colourful birds. They are known for their agility as they feed on insects while on the wing. They can often be found flying low to the ground over farmland and open pastures, particularly near water where there are lots of insects. In late summer they can be spotted perching together on telephone wires and power lines, readying themselves to migrate to Africa for the winter.

Key identification features:

Glossy blue upper parts, creamy-white under parts
Red throat and dark red forehead, but from a distance their whole head may appear dark
Long forked tail
They tend to nest in barns, lean-tos and other outbuildings, where they build cup-shaped nests of mud
Chattering call
Can be seen perching on telephone wires or wire fencing

When to spot them in the UK: March to October

How to identify house martins

House martins are commonly found in towns and villages, as well as in agricultural areas. They are one of the last of our summer migrants to depart in the autumn. They only eat while on the wing, catching insects as they fly. Their mud cup nests are usually spotted below the eaves of buildings.

Key identification features:

Small birds with glossy blue-black upper parts and pure white under parts
Distinctive white rump, short forked tail and white feathers covering its legs and toes
Shorter wings than swifts or swallows

When to spot them in the UK: April to October

How to identify sand martins

Sand martins are the smallest of all the European hirundines and one of the first spring migrants to appear. They are agile fliers, feeding mainly over water. They breed in colonies of up to 1000 pairs. Unique to sand martins, these birds burrow holes into sandy, dry vertical banks in sand pits, gravel pits, riverbanks, lakes, streams, railway cuttings, and even in drainpipes in walls and holes in brickwork.

Key identification features:

Dark brown upper parts, with pale tipped feathers. Upper wings, tails and flight feathers are dark brown
Under parts are white with a distinctive brown band across the breast separating the white throat from the white belly
Breast band on young sand martins is less visible and their necks and chins are a reddish brown
Short legs and feet which are dark brown or black
Short forked tail
Tend to swirl and flap rather than glide, and can be found mainly over water

When to spot them in the UK: March to October

Author Interview with Danielle J. Whittaker: The Secret Perfume of Birds

In The Secret Perfume of Birds, evolutionary biologist Danielle Whittaker reveals how she came to dispel the widespread myth that birds cannot smell. Mixing science, history and memoir writing, Whittaker offers a humorous and compelling narrative to describe how birds smell and how scent is important for all animals. The book offers readers a rare opportunity to witness the unfolding journey of scientific research and the surprising discoveries it can make.

Danielle kindly agreed to answer some of our questions below.

How did you find yourself studying the science of avian scent?

I was originally studying how birds might choose their mates on the basis of certain immune genes, following the idea that animals could prefer mates with different genes than their own, leading to offspring with stronger immune systems. I was struggling to sequence these genes, and I complained to a colleague who happened to be studying bird brains. He said, “I don’t know why you’d study that in birds – information about those genes is sensed by smell, and birds don’t have much of a sense of smell.” I had never heard that before, and the idea that a whole group of animals would lack such an important sense seemed absurd to me. So, I started investigating.

The idea that birds lack a sense of smell has persisted for more than a century despite being disproved by yourself and others. How did you navigate tackling long-held assumptions in the scientific community?

I conducted rather slow, incremental research, following where the questions led me. 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, and soon more people started researching bird smells!

Pink-sided juncos, female (left) and male (right)

I found the most fascinating part of your research to be the discovery that bird scents are linked to their microbiomes. How did you come to look into bacteria and could you expand on their important role?

When I first talked about my research with my now-collaborator Kevin Theis, he looked at the list of compounds I had found in bird odours and said, “those types of compounds are by-products of microbial metabolism. Have you looked at whether symbiotic bacteria are producing these odours?” I had never thought about that possibility before! Kevin studied the bacteria in hyena scent glands and how they produce the odours used by hyenas when they scent mark. Kevin and I teamed up to study the question in birds and we found out that he was right.

Danielle holding a male lance-tailed manakin in Panama

In this book, you demonstrated the importance of scent in bird reproduction. I wonder if human-related impacts on our environment are influencing changes to the unique scents of different species, with consequences for their reproductive success – is there any current research being done on this?

I am hoping to look at whether adapting to living in urban environments has affected the microbiome, and thus the scent, of bird populations compared to their non-urban counterparts. It’s very interesting to think about the long term consequences of such changes, but I don’t think there is much research about that yet in any animal.

Your work focuses on the dark-eyed junco, a bird commonly seen in North America. Is there a particular reason why you chose to study this species and do you have any plans to study other birds in this way?

I was a postdoc in Dr. Ellen Ketterson’s lab at Indiana University, and she has maintained a long-term study of dark-eyed juncos for many years. I quickly found that juncos were very easy to work with, and I appreciate that, in many ways, their biology and behavior makes them ‘typical’ northern hemisphere songbirds – which means they are a good model for understanding lots of bird species. I have studied odours in other species as well, in particular the lance-tailed manakin in Panamá. I am always interested in new birds!

Where will your research take you next? Do you have any plans for further books?

Right now, I’m interested in how social behavior changes animal microbiomes through bacteria sharing, and how that might affect odours. I’m also interested in looking at how microbiomes and odours have changed in urban populations of juncos. Beyond my junco research, my professional life has taken yet another unexpected turn, and I am transitioning to a new job as managing director of the Centre for Oldest Ice Exploration (COLDEX) at Oregon State University, where they study Antarctic ice cores to learn about ancient climate change. Maybe I’ll get to visit Antarctica and write about my new adventures!

The Secret Perfume of Birds: Uncovering the Science of Avian Scent
Hardback | £20.50

The Big Garden Birdwatch: NHBS Staff Results

We have reached the end of the 43rd Big Garden Birdwatch, which took place between Friday 28th and Sunday 30th January. Run by the RSPB, it’s one of the largest citizen science surveys in the UK and encourages the public to record their garden birds and submit their results. Over a million people took part last year, recording over 17 million birds, helping the RSPB gain an accurate understanding of how bird populations are faring.

Great spotted woodpecker on a window feeder by Ian Watson-Loyd

There’s still time to submit your results if you took part over the weekend, the final date to let the RSPB know what you saw is 20th February. But don’t worry if you didn’t get to take part this year; it is an annual event, so make sure to look out for it next year! To take part, all you need to do is spend 1 hour counting the birds that land in your garden, balconies or outdoor spaces. It’s important to count the highest number of each species, rather than the total amount you see over the hour, otherwise, you might end up counting the same individual twice. You can submit your results online on the RSPB website. To help you identify certain species, take a look at our range of field guides, as well as our previous identification guide blog posts here.

Over a million people took part last year, recording over 17 million birds, helping the RSPB gain an accurate understanding of how bird populations are doing. They now have over four decades of data, showing the trends in UK bird populations, which helps them which species are faring ok and which are in decline. Both goldfinches and great tits have benefited from gardens, with goldfinch populations in gardens increasing by 50% over the last decade. However, the Big Garden Birdwatch has also shown that thrushes and greenfinches sightings have decreased, with greenfinch recordings down by 65% and thrushes by 78%. We hope that more people have taken part this year, and, as always, many of our staff got involved. Scroll down to see what we found.

We’d also love to see what you’ve spotted if you took part – let us know in the comments below.

Results

Beth saw the highest quantity of birds this year, at 32 individuals:

Woodpigeons: 4

Blackbirds: 4

Chaffinches: 6

Magpies: 1

Robins: 2

Starlings: 4

Chaffinch (Fringilla coelebs) by hedera.baltica via Flickr

Sparrows: 5

Jackdaws: 2

Blue tits: 3

Blackcaps: 1

Female blackcap (Sylvia atricapilla) by Mick Sway via Flickr

Over the weekend, Catherine was visited by a large flock of starlings, as well as the most blue tits of all our staff results this year. She also managed to spot a reed bunting, an amber listed bird in the UK:

Starlings: 9

Crows: 2

Blackbirds: 1

Magpies: 1

Blue tits: 7

Woodpigeons: 2

Goldfinches: 1

Great tits: 1

Reed bunting: 1

Ian managed to spot the largest number of species this year, including a wren (Troglodytes troglodytes), another amber listed species:

Starlings: 1

Blue tits: 2

Woodpigeons: 4

Blackbirds: 1

Robins: 1

Great tits: 2

Magpies: 2

Dunnocks: 1

Goldfinches: 2

Blackcaps: 1

Wrens: 1

Male house sparrow by Steve Colwell (Channel City Camera Club) via Flickr

Female house sparrow by hedera.baltica via Flickr

I completed my Big Garden Birdwatch in East Sussex:

Great tits: 2

Blue tits: 1

Sparrows: 4

Starling: 1

Woodpigeons: 2

Robins: 1

Blackbirds: 1

Notably, one of the woodpigeons picked up a stick from my garden and flew off with it, a potential sign of nest-building behaviour.

Sabine had the highest number of jackdaws, one of our most recorded species in 2021:

Jackdaws: 6

Woodpigeons: 3

Blue tits: 2

Dunnocks: 3

Robins: 2

Great tits: 1

Magpies: 1

She also managed to capture this beautiful footage of one of her Robin visitors:

Our total

In total, we saw 16 different species and 105 individuals across our 5 gardens. Our most common bird species were starlings (Sturnus vulgaris), blue tits (Cyanistes caeruleus) and woodpigeons (Columba palumbus). Last year, our most common were long-tailed tits (Aegithalos caudatus) and jackdaws (Corvus monedula), and in 2020 it was house sparrows (Passer domesticus), followed by great tits (Parus major). It will be interesting to see how our results compare to the overall results of this year’s Big Garden Birdwatch.

Results

The RSPB

How to take part in the Big Garden Birdwatch

What did we learn in the 2022 Big Garden Birdwatch?

How can I encourage more birds and other wildlife to my garden?

Recommended books

How are rails faring?

Eurasian Coot (Fulica atra)

Moorhen (Gallinula chloropus)

Corncrake (Crex crex)

Spotted Crake (Porzana porzana)

Water Rail (Rallus aquaticus)

Sora (Porzana carolina)

Recommended books and equipment

Universal nest bricks

What is an owl pellet?

Where to find owl pellets

What species of owl is my pellet from?

How to dissect an owl pellet

How to identify the contents of an owl pellet

Further reading

Robert Gillmor 1936–2022

How to identify swifts

Key identification features:

How to identify swallows

Key identification features:

How to identify house martins

Key identification features:

How to identify sand martins

Key identification features:

Recommended reading:

Results

Our total

The RSPB