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0

The evolutionary rates of sea urchins are more complex than previously thought, a finding that could apply across the evolutionary tree.

 

Evolution within groups of organisms was first thought to occur continuously, at a constant rate. Fossil-based analyses soon led to the belief that many groups quickly reach maximum diversity early on in their history, followed by a decline in evolutionary rates as habitat types fill up.

 

Now, in a detailed analysis of a group of marine invertebrates called echinoids, Dr Melanie Hopkins of the American Museum of Natural History and Museum palaeobiologist Dr Andrew Smith have found a branch of the evolutionary tree that has increased its evolutionary rate over time.

Slow starters

Modern echinoids originated 265 million years ago, just before the Permian-Triassic mass extinction, an event that wiped out around 96% of all marine species. They still exist today as sea urchins and sand dollars.

 

Despite the abundance of ecological space left behind after the mass extinction, Dr Hopkins and Dr Smith found that echinoids experienced the lowest rates of evolutionary diversification during this early phase. Said Dr Smith of the result:

This slow start is very different from the standard model of high initial rates of diversification followed by a slowing down as ecological space gets filled that we have come to expect.

Bursts of diversity

When they looked in more detail at sub-groups of echinoids through time, they discovered that some that underwent episodes of 'early bursts' in evolution, primarily associated with the adoption of new feeding strategies.

 

For example, one particular group of echinoids - the sand dollars - evolved a novel method of 'deposit-feeding' that allowed them to filter nutrients from the sand, and this innovation coincided with a marked increase in morphological innovation.

 

Echinoids-700.jpg

Regular echinoids like the sea urchin (left) have five-fold symmetry and can head in any direction, whereas irregular echinoids, like the sand dollar (right) have two-fold symmetry, with defined 'front' and 'back' ends.

 

A question of scale

The overall pattern of slowing evolutionary rates punctuated by smaller 'early burst' events within certain subgroups points to the importance of considering scale when assessing the evolutionary history of any group. Said Dr Smith:

Rates of evolution turn out to be quite different when viewed at different scales, and both 'continuous' and 'early burst' patterns of evolution may apply to the same group depending upon how you view them.

 

More information:

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A species of bryozoan transplanted to an area with increased ocean acidity has been found to grow at half the rate of those living in normal ocean conditions.


Bryozoans are coral-like animals that live in colonies and build their skeletons out of calcium carbonate. An international team including Museum researcher Dr Paul Taylor transplanted several budding colonies from their normal homes in the Mediterranean to an area near an active volcanic vent in Italy.

 

The undersea vent expels heat and carbon dioxide, simulating the global surface ocean acidity predicted for the year 2100 as a result of increased anthropogenic carbon dioxide emissions. According to Dr Taylor:

Entire ecosystems are threatened by ocean acidification, and this will have economic consequences because animals such as bryozoans are often habitats for the juveniles of commercially exploited fishes and crustaceans or may be in their food chains.

20150211 Bryozoan Calpensia nobilis © Lombardi et al..jpg

The bryozoan Calpensia nobilis showing normal growth at the leading edge © Lombardi et al, 2015.

 

During a three-month experiment, the bryozoan colonies around the vent suffered slower growth rates, the absence of some growth stages, and the corrosion of their skeletons. However, individual zooids – the tiny creatures that build the colony – were longer than normal.

 

Dr Taylor thinks this could be an indication of adaptation by the bryozoans to the changing environmental conditions. The colonies seemed to invest more energy in completing zooids that had already started to form rather than budding new generations. In other words, they were strengthening the existing colony rather than expanding.

 

Longer studies are needed along with more detailed information about how the colonies are reacting to possible future scenarios. Said Dr Taylor:

With this information, better predictions could be made of organism survival and evolution, and thus ecosystem changes, loss or survival in a changing world.

The research is published today in the journal Royal Society Open Science.

 

0

An innovative jaw bone study has revealed that a Jurassic fish ate like modern sea breams.

 

By measuring the jaws of 89 examples of the fish Dapedium, including specimens from the Natural History Museum, University of Bristol undergraduate Fiann Smithwick was able to recreate how it ate. He said:

My work indicates that Dapedium was well adapted to crush shells, feeding on bivalves and other hard-shelled creatures that it could scrape from the sea floor.

Dapedium-700.jpg

A Dapedium specimen from our collections.

 

The good preservation of the fossil fish specimens allowed Fiann to use a mechanical model developed to understand modern fishes in his study. By calculating the positions and orientations of the jaw muscles, he was able to determine that Dapedium's jaws moved slowly but strongly, allowing it to work on the hard shells of its prey.

 

In contrast, other families of fish can have faster but weaker jaws, adapted for feeding on fish prey that are speedier and slipperier.

Ancient fish, historic collections

Dapedium lived 200 million years ago during the Jurassic period, and is one of many ancient sea creatures discovered by Mary Anning in the rocks around Lyme Regis, Dorset.

 

Museum fossil fish curator Emma Bernard said:

Dapedium is an iconic fossil from Lyme Regis and can be found on many postcards and souvenirs from Lyme Regis. If you are lucky you may even find one when fossil hunting in Lyme Regis.

Viewed from the side, Dapedium was a flat, deep-bodied fish that could grow up to half a metre in length. It had jutting front teeth with a mass of blunt teeth behind. Emma said Fiann was a pleasure to work with as he grasped the importance of our historic collections:

This study would not have been possible without the extensive fossil collections we house, which show a variety of characteristics that Fiann used for his study. His work helps us build up a picture of how Dapedium lived and what it ate.

The study appears in the prestigious journal Palaeontology - a rare achievement for an undergraduate.

0

Finds from Taiwan and Israel shed light – and confusion – on the story of ancient human species.

Find 1: A mysterious jawbone from Penghu, Taiwan

Discovered by chance by fishermen off the coast of Taiwan, an unusually thick and primitive human jawbone shows a challenging mix of features. While no DNA has yet been recovered from the specimen, its characteristics make it difficult to classify into existing groups.

 

The jawbone is short and wide, with a thick body and large teeth. It dates within the last 450,000 years, and most likely within the last 200,000.

Jawbone-Split_3179032b.jpg

The jawbone, left, and a reconstruction of the jaw, right © Yousuke Kaifu.

 

A partial Homo erectus skull from the Chinese mainland has some large associated teeth and could be 400,000 years old, so the new jawbone may belong to the same group. But it could also be one of the elusive ‘Denisovans’, a group known only by DNA from a fragmentary fossil finger bone and two very large molar teeth in a Siberian cave.

 

Museum human origins expert Prof Chris Stringer said this could be an interesting development:

I have considered the Denisovans as an Asian sister group of the Neanderthals, and like them, derived from Homo heidelbergensis, but if Penghu is indeed a long-awaited Denisovan jawbone, it looks more primitive than I would have expected.

He said of the find:

As the authors note, this enigmatic fossil is difficult to classify, but it highlights the growing and not unexpected evidence of human diversity in the Far East, with the apparent co-existence of different lineages in the region prior to, and perhaps even contemporary with, the arrival of modern humans some 55,000 years ago.

Read the original paper

 

Find 2: The skull of a possible early migrant, from northern Israel

A later and much better-dated specimen, the partial skull of an early modern human from Manot Cave dates to a time of migration out of Africa and interbreeding with Neanderthals. At about 55,000 years old, it sits comfortably in the timeframe estimated for early modern human and Neanderthal interbreeding, 50-60,000 years ago.

 

The skull itself has characteristics indicative of early modern humans, and without DNA it is impossible to say yet whether interbreeding with Neanderthals had an impact on the individual. Nonetheless, Prof Stringer said it is a critical find for examining possible migrant populations:

Manot might represent some of the elusive first migrants in the hypothesised out-of-Africa event about 60,000 years ago, a population whose descendants ultimately spread right across Asia, and also into Europe. Its discovery raises hopes of more complete specimens from this critical region and time period.

Read the original paper

 

Related human origins posts:

1

Two species of wasp have been identified as belonging to a whole new genus endemic to the isolated Atlantic island of St Helena.

 

St Helena, a British Overseas Territory, is home to more than 400 species that can't be found anywhere else. However, the wildlife is under serious threat from development and invasive species.

Napoleon complex

The new wasp genus, named Helenanomalon in honour of its home territory, belongs to a family of parasitoid wasps - those that spend a part of their lifecycle on another organism that they eventually kill. However, little is known about the specific lifestyle of Helenanomalon since only a handful of specimens are known to exist.

Helenanomalon-700.jpg

One of the new wasps species, Helenanomalon bonapartei

 

The most recent specimens came to the Museum following a collecting expedition in 2006 that included the former Head of Entomology collections at the Museum, Howard Mendel. On re-examining the specimens, and a couple of others at the Musée de l'Afrique Centrale, Museum hymenoptera curator Dr Gavin Broad assigned them to two different species in the new genus:

These little wasps belong to the family Ichneumonidae, a huge family with over 24,000 described species in the world, but with only six species known to have made it all the way to St Helena. That two of these species form a genus not known anywhere else in the world is remarkable.

One of the new species, Helenanomalon bonapartei, is named after St Helena's most famous exile, whilst Helenanomalon ashmolei is named after Philip and Myrtle Ashmole, who have led recent work in exploring and documenting the fauna of St Helena.

Lost giants

Islands like St Helena often host unique organisms that have evolved in isolation for millions of years. However, these species are also extremely vulnerable to changes such as introduced predators and habitat loss.

 

St Helena used to be home to the world's largest earwig, the giant earwig, which reached over 8cm long and lived in deep burrows. Only a few specimens of the giant earwig have been recorded, and several scouting trips since the 1960s have failed to find any living examples. It is now considered extinct.

Giant-earwig-700.jpg

St Helena giant earwig, Labidura herculeana

 

Says Dr Broad:

The extinction of the giant earwig was a sad reminder of how vulnerable island endemics can be. There is still much work to be done on assessing just how unique the St Helena fauna is, and Philip Ashmole tells me that they have collected other potentially new genera of insects and spiders but the taxonomy of the groups concerned is difficult and there are few people with the expertise.

 

The native vegetation has been massively reduced by the usual pressures of introduced goats, non-native species, inappropriate agriculture, and so on. Restoring the native vegetation, particularly the seriously denuded forests, is the most important step in conserving the unique invertebrates.

0

Professor Richard Fortey, one of the world’s leading palaeontologists, has been awarded the Lapworth Medal this week at the annual meeting of the Palaeontological Association.

richard-fortey.jpg


The award recognises Professor Fortey’s contribution to palaeontology over his entire career, more than 40 years of which have been at the Museum.

 

Said Prof Fortey of receiving the honour:

‘It is a great honour to receive the Lapworth Medal, which is the only ‘lifetime achievement’ medal in British palaeontology. Charles Lapworth, after whom the medal is named, was one of the great nineteenth century scientists - and the originator of the Ordovician period, the age of the rocks on which I have spent much of my research life. And my old professor Harry Whittington was the first ever recipient of the same medal.

 

Diverse  research

 

Prof Fortey’s research career has focused around the evolution of some of the earliest animals, but he has contributed to a wide variety of geological and palaeontological topics.

 

Fellow palaeontologist Professor Derek Briggs of Yale University, one of those who nominated Prof Fortey, commented:

Richard’s research is remarkable for its breadth, covering topics as diverse as Palaeozoic biostratigraphy and biogeography, the evolutionary history and biology of trilobites and graptolites, and the emergence of major groups during the Cambrian explosion.


Prof Fortey began his career at the Museum more than 40 years ago, and still works here as a research associate. Throughout this time he has received numerous honours and awards. He became a Fellow of the Royal Society in 1997.

The great thing about palaeontology is that it is always moving somewhere new. There are always new and wonderful fossils to be discovered, so really the ‘book of life’ is constantly being rewritten.

A major part of Prof Fortey’s research has focused on one group of ancient marine animals, the trilobites, of which he says:

[They] may seem rather esoteric, but the fact that trilobites were around for nearly 300 million years and number many thousands of species, with more being discovered all the time, means that there is no shortage of new work to do.

 

drystoreroom1.jpg

One of Prof Fortey's seven general-audience books

 

Public engagement


Prof Fortey says he dislikes the ‘ivory tower’ view of science and has combatted this through seven critically-acclaimed books aimed at a general audience. These include: Life, an unauthorized biography (1998), which tells the story of the evolution of life on earth as seen through his scientific experience, and Dry Store Room No. 1, about the weird and wonderful secrets of the Museum’s collections. He is also a TV presenter, with his most recent series, Fossil Wonderland, airing on BBC Four earlier this year.

 

Related links

 


0

To celebrate the countdown to Christmas, two of our geology curators have been revealing daily treats from their collections.

 

Last December, micropalaeontology curator Dr Giles Miller tweeted a series of patterned slides made up of microfossils including a miniature Christmas card, and this year he’s back with something a little bigger.

micro2.jpg

Model of Globigerinoides 'Santa' sacculifer.

 

In fact, the specimens are 10s to 100s of times larger than they are in real life – they’re samples from our new microfossil tree. The tree is a gift from scientist Zheng Shouyi of the Institute of Oceanology, Chinese Academy of Sciences, who oversaw the creation of a foraminiferal sculpture park in Zhongshan City, China.

 

The tree is made up of 120 plastic models of usually microscopic single-celled marine organisms. The delicate models represent the wide variety of shell compositions and structures found in nature.

 

microfossiltree1-700.jpg

The microfossil tree.

 

The tree is not only full of beautiful specimens, but a welcome addition to our collections. Says Dr Miller:

It helps us explain the relevance of tiny objects normally hidden behind the scenes and illustrate our science. Eleven of the species modelled are species for which we hold the type specimen and are amongst the specimens that I curate.

The tree was first unveiled at this year’s Science Uncovered event, and while a permanent spot in the galleries is found for it, a few examples of the little sculptures will be on display in 2015.

 

In the meantime, you can get a sneak preview by following Dr Miller on Twitter where he’s posting a different specimen every day in the run-up to Christmas using the hashtag #MicropalaeoAdvent.

micro1.jpgFlintinoides labiosa (in fancy dress as Blitzen!) showing off its aperture.

 

Although not dressed up in festive gear, Dr Miller’s favourite specimens tweeted so far are the star-like pair of Hantkeninids, which he says are ‘amazingly beautiful and scientifically important for climate change studies’.

micro3tweet.jpg

Ore-some festive treats

 

Ores collection curator Helena Toman decided to highlight a select few samples from the Museum’s extensive collection of ores - naturally-occurring minerals or assemblage of minerals from which economically important constituents, particularly metals, can be extracted.

I like to think of economic geology as occupying one of those crucial interfaces between science and society and so one of my challenges is to make the science accessible to society.

 

I wanted people to understand just how crucial economic geology is to their everyday lives - how each and every one of us act as a catalyst for mining.

ore-some-reveal.jpgGo to the ore-some Christmas reveal calendar >

 

 

She had a lot of choice for specimens – the collection began its life in the Museum of Practical Geology in 1838, and has now grown to more than 16,000 specimens, representing one of the best historical records for global mining activities.

 

The collection is very active – constantly growing through fieldwork, donations and acquisitions, and being used for research and public outreach.

 

One of her favourites even made it to Parliament this year to help inform ministers about the importance and relevance of the UK’s geological heritage. The sample is from the famous Geevor tin mine in Cornwall, and includes veins of copper.

 

geevor-tin-2.jpg

Sample of ore from the Geevor tin mine.

 

Another favourite is a stunning example of cobalt ore from Morocco, which Helena collected herself on a recent fieldtrip.

This sample not only represents the experience of a wonderful and successful fieldtrip but also highlights the cutting edge research that Museum scientists are taking part in, using microbes to extract metals from their ores. The textures within this sample are also incredible – ores rarely get prettier!

cobalt-ore-2.jpg

Cobalt ore from Morocco.

 

All our curators are enthusiastic about their collections, and Helena hopes her and Dr Miller’s efforts will inspire others to dust off some of their favourite specimens:

I would love the format to be adopted by other curators as an annual method by which the Museum promotes the important work that curators have done, behind the scenes, that year. The calendar is a fun, approachable method that allows curators to have a voice/corner in which to show the world why our collections matter.


0

A Kickstarter project has launched to raise funds for a new app that reveals the beauty and diversity of the world's bees, using many Museum specimens.

 

1000 Bees is an interactive art project to raise the profile of bees and highlight their plight across the globe. While many people are aware that honeybee colonies are facing collapse, 'honeybee' is a term applied to just 11 species, and many other bee species are also important pollinators.

 

As the project creators Ana Tiquia and Callum Cooper say:

Wild bees are just as important for pollination and play a crucial role in ecosystems throughout the world. Many wild bees face similar threats to the honeybee: bee-killing pesticides, loss of habitat for forage and nest sites, and climate change.

1000 Bees aims to raise £90,000 in order to create the dynamic app, including an animation that flicks through all of the one thousand species in its gallery.

Enormous bee resource

The 1000 Bees app will showcase high-resolution images of bee specimens, many of which are housed at the Museum. As well as photographs, the Museum contributed information on specific bee specimens, including a couple of bees collected at least 212 years ago and a giant bee collected by noted naturalist Alfred Russel Wallace.

 

giant-bee.jpg

A giant carpenter bee, Xylocopa perforator, collected by Alfred Russel Wallace on the island of Timor.

 

 

Museum bee curator David Notton said:

As a curator, art projects aren’t my core work but it’s nice to have one now and again, as it gets the collection to new audiences and realises the wider cultural value of the collection.

There are over 20,000 species of bee in the world, but Notton's favourite is probably a rare species he recently managed to find on Blackheath in southeast London called the shrill carder bee. Described by the Bumblebee Conservation Trust as 'probably the UK's rarest species of bumblebee', it is one of 90 bee species found on Blackheath and was spotted by Notton while intensively surveying the area for bees during 2014.

 

0

Despite bouncing around the surface and coming to rest in the shadow of a cliff, the Rosetta mission to sample a comet has transmitted vital scientific data back to Earth.

 

The European Space Agency (ESA) spacecraft called Rosetta launched in March 2004 (two years before Twitter!). For the next 10 years it travelled to the comet Churyumov-Gerasimenko, or 67P for short, near the orbit of Jupiter. It reached the comet this August, and after taking measurements a landing site was selected for its detachable probe named Philae.

Answering big questions

Philae is the first man-made object ever to intentionally land on a comet (a previous mission had been deliberately crashed into one, but not landed). Its mission was to collect information about the composition of 67P. It is thought that comets formed when the solar system was young, 4.6 billion years ago, and have remained relatively unchanged and undisturbed ever since.

 

According to Museum extraterrestrial materials researcher Dr Penelope Wozniakiewicz:

Comets contain the most pristine examples of the materials available during the early history of the solar system. Studying cometary samples provides us with the opportunity to learn about the conditions and processes that operated back then.

The landing was the most complex part of the mission and successfully took place on Wednesday 12 November, but it wasn't without complications.

 

The News in brief team captured the milestones leading up to Philae's bumpy touchdown in a Storify, and you can catch up on the events of the day as they happened.

Off to a good start

It started overnight on 11 November with a series of Go/NoGo decisions - a final checklist of whether all systems were operating and ready to go. All decisions were Go, despite a problem detected with the cold gas thruster around 7.00 GMT. The thruster is part of the apparatus designed to help Philae latch on to the comet. The extremely weak gravity of the comet meant Philae would have to work to secure itself to the surface using just its harpoons and foot screws.

 

https://pbs.twimg.com/media/B2Qif4hCMAALdwW.jpg

Philae's landing apparatus © ESA

 

The hundreds of millions of kilometres between comet 67P and Earth mean that any signals coming from Rosetta or Philae took about 30 minutes to reach Earth. Philae separated from Rosetta just after 8.30 GMT on 12 November and confirmation was received at ESA just after 9.00 GMT.

 

It then took Philae seven hours to travel to the comet's surface, all the while switching on scientific instruments and taking measurements and photos. While everyone waited expectantly for news of Philae's arrival, the Nature Live team at the Museum interviewed ESA Rosetta scientist Leah-Nani Alconcel about what it takes to catch a comet. She described how big the comet was, as shown by an ESA provided graphic of how it would look when hovering over London, and the aims of the mission:

 

https://pbs.twimg.com/media/B2P4tdICMAAeEqA.jpg

Comet 67P compared to London © ESA

 

When Philae finally got back in contact it looked like it was safely on the surface, and celebrations and congratulations started to pour in.

Rosetta-tweets.jpg

Inspirational tweets from the Chief Scientific Adviser to the President of the European Commission

Teething problems

However, it soon became clear that Philae's harpoons did not fire upon landing. Without harpoons or the cold jet thruster, the lander was vulnerable to bouncing across the surface of the comet.

 

After several hours of confusion, it turned out that Philae had indeed bounced across the surface, touching down three times in total before coming to rest. The first bounce caused Philae to drift hundreds of metres above the surface for nearly two hours. A second bounce lasted only six minutes.

 

Finally, more than 24 hours after Philae separated from Rosetta, we got to see the view from the surface of a comet:

Philae-landed.jpg

Philae's final landing site on the comet © ESA

 

Although Philae was down safely and transmitting back to Earth, it was not at its intended landing site, and the race was on to use Rosetta's cameras to locate its exact position on the comet. From the photos Philae sent back, however, it was clear that it had come to rest at the base of a cliff, and in considerable shadow for most of the day.

 

This was a problem for its power supply, which comes from solar arrays. Comet 67P was always intended as Philae's final resting place after it ran out of solar power, but the shade meant it would have an even shorter lifespan.

Mission (nearly) accomplished

Philae shut down early on Saturday 15 November, but not before drilling into the comet and performing 80% of its planned scientific readings. The data beamed back to Earth will take months to analyse, but already scientists have one conclusion: the material making up the comet beneath its dusty covering is far harder than anticipated. It's more akin to rock than ice, breaking some instruments. It also explains Philae's first high bounce; the impact of landing was not absorbed by a soft surface as had been hoped.

 

Philae may yet be able to recharge and come back to life, but even if not, Museum planetary scientist Prof Sara Russell thinks the mission has been a huge success:

I think it is exciting and amazing that some data has been acquired and transferred to Earth by Philae. These data are now being processed by the mission scientists, so there is no further news about what has been sent back, and there may not be for a while. I am hoping that the lander was able to make chemical analyses of the cometary material.

Rosetta as a mission is already a success, as the orbiter has been successfully acquiring lots of information about the comet. The lander part of the mission was always the most risky but it has worked remarkably well too, sending us beautiful and intriguing images of the comet surface.

At the time of writing, the hunt is still on for the lander. The latest news is that Rosetta was able to capture images of Philae as it approached the comet's surface, and also during the first bounce where the lander can be seen heading 'east' and away from the planned landing site:

 

OSIRIS_spots_Philae_drifting_across_the_comet.jpg

Rosetta’s Philae lander as it approached and then rebounded from its first touchdown on Comet 67P/Churyumov-Gerasimenko on 12 November 2014. The final inset image (top right) in the series shows the lander during its bounce, not its final resting place that is still be found. © ESA

 

 

0

A comprehensive catalogue of the world's bird species, which used thousands of specimens from the Museum's collections, is the new gold standard for the taxonomy and conservation of birds.

 

The first volume of the Illustrated Checklist of the Birds of the World, released earlier this summer, defines more than 400 new species of bird.

 

Species for conservation

 

The book was authored by Josep del Hoyo and BirdLife International author and Museum scientific associate Nigel Collar. Part of Collar's job at BirdLife is to help feed into the IUCN Red List - a global record of the conservation status of the world's plants and animals.

 

For this, he needed a robust list of the world's bird species. Whether a bird gets defined as a separate species or not is important for its conservation. If a bird is defined as a subspecies (a variant of a species) many birds will go extinct without ever getting proper conservation attention.

 

Conversely, if too many birds are defined as species, the concept of a species becomes devalued and the idea of conservation becomes difficult to manage.

 

Determining differences

 

In the Illustrated Checklist, birds up for consideration as a new species were scored on a number of characteristics, with particular focus on plumage and voice - the traits important for determining whether breeding can occur between two birds.

 

The results of the first volume estimate that bird diversity may have been previously underestimated by around 10%, meaning one-in-ten birds have been ignored by conservation efforts.

 

In addition to 462 new bird species, the criteria also merged 30 existing species into other species, creating new subspecies.

 

helmetcrest.jpg

The Bearded Helmetcrest hummingbird is now recognised as four different species - one of which hasn't been seen in nearly 70 years.

© Francesco Veronesi, Flickr Creative Commons.

 

Camped out in the collections

 

For the physical characteristics of birds, Collar says that our Museum collections at Tring have been indispensable:

To look carefully at the characteristics of birds you need them right under your nose. The Museum has the best collection in the world with the best reputation. It's utterly invaluable.

 

He looked at thousands of specimens for the first volume of the book, and is now ‘camped out' at Tring researching for volume two.

 

Thousands of birds

 

Collar, del Hoyo and their co-authors assessed the species status of around 1,000 birds for the first volume, which covers non-passerines. Passerine birds account for over half of all the world's bird species and are often called ‘perching birds' thanks to the arrangement of their toes.

 

The authors have another 1,000 birds in the passerines group to consider before they release volume two of the Illustrated Checklist, due out in 2016.

 

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