Weird Dinosaurs: The Strange New Fossils Challenging Everything We Thought We Knew
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From the outback of Australia to the Gobi Desert of Mongolia and the savanna of Madagascar, the award-winning science writer and dinosaur enthusiast John Pickrell embarks on a world tour of new finds, meeting the fossil hunters who work at the frontier of discovery. He reveals the dwarf dinosaurs unearthed by an eccentric Transylvanian baron; an aquatic, crocodile-snouted carnivore bigger than T. rex that once lurked in North African waterways; a Chinese dinosaur with wings like a bat; and a Patagonian sauropod so enormous it weighed more than two commercial jet airliners.
Other surprising discoveries hail from Alaska, Siberia, Canada, Burma, and South Africa. Why did dinosaurs grow so huge? How did they spread across the world? Did they all have feathers? What do sauropods have in common with 1950s vacuum cleaners? The stuff of adventure movies and scientific revolutions, Weird Dinosaurs examines the latest breakthroughs and new technologies that are radically transforming our understanding of the distant past.
“This history of the discovery of some of the most outlandish creatures that ever lived, and the excitement of paleontological research, will be sure to both entertain and instruct.”—Spencer Lucas, author of Dinosaurs: The Textbook, Sixth Edition
“Fascinating.... Readers learn of beautiful opalised dinosaur bones from Australia and a crested dinosaur found approximately 13,000 feet up Antarctica's Mt. Kirkpatrick, demonstrating that dinosaurs were widely distributed across the globe.”—Publishers Weekly
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Weird Dinosaurs - John Pickrell
THE STRANGE NEW FOSSILS CHALLENGING EVERYTHING WE THOUGHT WE KNEW
JOHN PICKRELL
Columbia University Press
New York
Columbia University Press
Publishers Since 1893
New York Chichester, West Sussex
cup.columbia.edu
First published in Austrailia by NewSouth, an imprint of UNSW Press Ltd.
Copyright © 2016 John Pickrell
All rights reserved
E-ISBN 978-0-231-54339-2
Library of Congress Cataloging-in-Publication Data
Names: Pickrell, John.
Title: Weird dinosaurs / John Pickrell.
Description: New York : Columbia University Press, [2017] | Originally published in Australia by University of New South Wales Press, 2016.
| Includes bibliographical references and index.
Identifiers: LCCN 2016057392 (print) | LCCN 2016059780 (ebook) | ISBN 9780231180986 (cloth : alk. paper) | ISBN 9780231543392 (e-book : alk. paper) | ISBN 9780231543392 (e-book)
Subjects: LCSH: Dinosaurs. | Animals, Fossil. | Paleontology. | Paleontological excavations.
Classification: LCC QE861.4 .P53 2017 (print) | LCC QE861.4 (ebook) | DDC 567.9--dc23
LC record available at https://lccn.loc.gov/2016057392
A Columbia University Press E-book.
CUP would be pleased to hear about your reading experience with this e-book at [email protected].
Book design Jo Pajor-Markus
Cover design Xou Creative
Cover images FRONT: Spinosaurus, © Davide Bonadonna BACK: Top Yi qi, © Emily Willoughby Bottom Regaliceratops, © Royal Tyrrell Museum of Paleontology/Julius Csotonyi
For my mother, who encouraged my passion for natural history.
CONTENTS
World map
Foreword by Philip Currie
Introduction: A new golden age for dinosaur science
1 Monster from the Cretaceous lagoon
The Sahara, Egypt
2 All hail the dino-bat
Hebei Province, China
3 Dwarf dinosaurs and trailblazing aristocrats
Transylvania, Romania
4 Horny ornaments and sexy ceratopsians
Alberta, Canada
5 The ‘unusual terrible hands’
Gobi Desert, Mongolia
6 Scandalous behaviour and enfluffled vegetarians
Siberia, Russia
7 Cretaceous creatures of the frozen north
Alaska, United States
8 The hidden treasures Down Under
Lightning Ridge, Australia
9 Record-breaking titans
Patagonia, Argentina
10 Southern killers set adrift
Mahajanga Basin, Madagascar
11 Polar pioneers and the frozen crested lizard
Transantarctic Mountains, Antarctica
Future potential
Glossary
Further reading
Acknowledgments
Notes
Credits
Index
FOREWORD
As a kid growing up in eastern Canada in the 1950s, I was proud of the fact that I knew every dinosaur name that I ever found in a book. And I thought that after more than a century of research on dinosaurs we must have known most of the dinosaurs that had ever lived. Fortunately for my future career choice, I was proved wrong about that.
Today, I am amazed that there are still children who can recite great lists of dinosaur names – even new names with complex pronunciations from China and other countries. The difference is that today they have perhaps ten times as many names to learn, and the rules for naming them are much less straightforward. Furthermore, we now realise that our knowledge of dinosaur diversity is but a small fraction of what it must have been during the Mesozoic Era.
As an example, one of the richest known dinosaur sites in the world is Dinosaur Provincial Park in Alberta, Canada. The rocks are Cretaceous in age, and represent a coastal floodplain spanning a narrow window of time that covers less than 5 million years. More than 45 dinosaur species have been identified from here – and even after a century of intensive field research, new species are continuing to be identified. That in itself is remarkable. But when you consider that it has about 4 per cent of the world’s known dinosaur species, then you start to realise how very little we know about dinosaurs in most parts of the world.
Dinosaur Provincial Park is just one site representing a single complex of environments that covers less than 3 per cent of the time frame over which dinosaurs existed. Excluding their bird descendants, dinosaurs dominated the world for almost 150 million years, and it is doubtful that any single species was in existence for more than a few million years. They occupied every corner of the world and, like modern animals, different species would have been adapted to live in specific environments. Now if every environment and time period had as many dinosaur species as Dinosaur Provincial Park, then it is evident that there must have been tens of thousands of species that are not known.
In fact, one of the reasons so many new dinosaurs are being discovered these days is that scientists can identify the relative ages and ancient environments of rocks in different parts of the world. If our present knowledge of the dinosaurs from that time period, geographic area and/or environment is poor, then we can maximise our chances of finding a new species by going there to hunt for their remains. And this is just what people have been doing in recent years, in locations from China and Australia to Madagascar and Alaska.
There is of course a lot more involved. For example, not every rock type or site has the same potential for preserving fossils, and many palaeoenvironments would have been inappropriate for fossilising anything. Nevertheless, the example of Dinosaur Provincial Park shows that the potential for new discoveries is immense for other parts of the world that have so far been little explored for fossils.
Given the fact that we have likely discovered such a small number of the dinosaur species that must have lived in the past, the odds are against these few being the most unusual examples. New discoveries are constantly challenging our beliefs that previously known dinosaurs are weird. Allosaurus and Tyrannosaurus look pretty normal compared to crested or horned theropods, such as Cryolophosaurus or Majungasaurus – or even stranger new discoveries such as Deinocheirus or the various small feathered, flying dromaeosaurs of China.
The ‘weirdness’ of any animal is of course a function of our lack of familiarity with it, and books like this are critical for understanding that dinosaurs have adaptations, appearances and behaviours every bit as diverse as those seen across the full range of modern animals.
Dinosaurs have long fascinated scientists and the general public alike, and there seems to be an unquenchable thirst for new information. Weird Dinosaurs is a book for the thirsty – packed with new knowledge and strange stories about recent finds that few readers will have heard before.
Philip Currie, MSc, PhD, FRSC
Professor and Canada Research Chair, Dinosaur Palaeobiology
University of Alberta
A NEW GOLDEN AGE FOR DINOSAUR SCIENCE
On a recent afternoon spent in London’s Natural History Museum (NHM), I noticed that a life-size animatronic Velociraptor had finally sprouted feathers. They might have been a touch sparse compared to the plumage of counterparts in museums elsewhere, but it was encouraging to see them there. A few years earlier, the Tyrannosaurs: Meet the Family exhibition at the Australian Museum in Sydney had featured not only wonderful feathered fossils from China, but also models of shaggy carnivores that could have been swiped from Jim Henson’s workshop yet were still creepy enough to strike fear into the hearts of gobsmacked kids.
Similarly, a model of Velociraptor relative Deinonychus at the Vienna Museum of Natural History in Austria is now lavishly feathered with beautiful, russet-hued plumage, small wings and a fetching mohawk, while the Dinosaurs Among Us exhibit at the American Museum of Natural History (AMNH) in New York is brimming with magnificent reconstructions that make it very clear our stereotypical conceptions of dinosaurs are dead and the boundary between these creatures and birds has become entirely blurred. So much has changed about our knowledge of dinosaurs – and in the seeming blink of an eye, too.
In 2014, my previous book, Flying Dinosaurs: How Fearsome Reptiles Became Birds, was published. It was the culmination of more than a decade of reporting stories about dinosaurs, and brought my time as a science writer back full circle to my postgraduate degree at the NHM. Writing that book, and talking to dinosaur hunters and museum scientists around the world about their astonishing discoveries, was a fascinating journey for me, and reawakened my love of these prehistoric enigmas.
But as I spoke to people about the Chinese work on feathered fossils, I realised something special was happening worldwide. From Siberia to Morocco and Alaska to Madagascar, new dinosaur discoveries were being made faster than ever before. There are so many new species and such a stream of fresh information that it is difficult for palaeontologists just to keep up with the research in their specific field of interest or the latest discoveries from their home nations. I’ve been lucky to experience some of the new finds myself on fossil digs and visits to museums in China, Mongolia and outback Australia. And alongside all these discoveries are fascinating tales of the people behind the research – their anecdotes from fossil digs and the historical legends of adventure.
More dinosaurs are being discovered right now than ever before – and not just a few more: the rate of discovery has been increasing nearly exponentially. The figures are fairly staggering: more than 50 new species of ceratopsian dinosaur, related to Triceratops, have been named since 2002 – many in North America, where Jurassic Park–inspired kids of the 1990s have grown into an army of new professional palaeontological recruits.
Having more feet on the ground in places that have historically been productive fossil localities is one way to find new fossils, but opening up whole new horizons is another – either novel slices of prehistoric time in the rocks, or whole new geographic locations. And this has been happening in earnest in the last two decades, most notably in China (where more than 150 new dinosaurs have been discovered since the early 1990s) and South America (where more than 40 titanosaur sauropods have been described in the last decade).
But, as you will see in this book, new fossils are now coming from all over, like never before – from Siberia, Australia, Alaska, Venezuela, Uzbekistan, Madagascar, South Africa, Romania, Mongolia, Malawi and even Antarctica. In many of these regions, growing wealth and development are helping homegrown palaeontology blossom, while local fossil hunters who studied in the West are now building their own teams and capabilities.
An abundance of dinosaur riches
It is extraordinary to note that the vast majority of species and what we know about dinosaur biology has come in the last few decades. A rough crunch of the figures suggests that around 50 per cent of all known dinosaur genera (genera are groupings of related species, e.g. the genus Homo includes the species Homo sapiens and Homo neanderthalensis)¹ have been found in the last 10 years, and nearly 75 per cent since 1990. Back then there were just 285 established genera;² in 2006 it had risen to about 527;³ and currently it’s about 1100, depending on the number of valid species you accept.⁴ And this is just the figure for genera, which underestimates the number of actual species.
Back in 1993, when Jurassic Park was released in cinemas, it was bang up to date and based on the most recent science – but so much has changed since then that the public perception has struggled to keep up. Dinosaurs are no longer the green or grey, dim-witted, lizard-like creatures we thought they were before the 1980s, nor the scaly, reptilian predators we remember best from Jurassic Park. Today we know they were fleet-footed and often feathery, with sharp intellects and also strange behaviours, physical attributes and adaptations.
If you are not familiar with these ‘weird’ dinosaurs, then this book will open your eyes to a whole new prehistoric world. They include creatures that have snatched the headlines in recent years, such as Spinosaurus, a swimming, sail-backed predator from Africa that was larger than T. rex; and Deinocheirus, a huge ornithomimid dinosaur with massively long arms, the hump of a camel and a duck-like bill. Both of these were creatures first found long ago by German and Polish explorers, but were lost in the mists of time and the dust of the desert until new specimens were found and old quarries rediscovered. This is part of a recent trend in palaeontology of sleuthing out old fossil sites based on historical maps, notes and photographs, and it sometimes results in thrilling detective stories.
Even though we have likely so far only scratched the surface of dinosaur diversity, what we are finding is allowing experts to ask questions of a kind they have never been able to ask before. Large collections of specimens and species mean that these scientists can fill gaps in databases and in their understanding of the anatomy and evolution of dinosaurs in all the major groups. They are starting to discover new patterns in how some dinosaurs evolved in one region and fanned out to colonise other parts of the world.
Elsewhere, researchers are realising that the southern landmasses that once formed the supercontinent of Gondwana (South America, Australia, Africa, Madagascar, India and Antarctica) had their own unique fauna of carnivores and herbivores during the Cretaceous period. These discoveries tell us more than just about the dinosaur themselves, they give us clues to the movement of the continents and the ancient climatic conditions on our planet.
From the tropics to the poles
Once there was an idea that dinosaurs were cold-blooded and only thrived in the swamps and wetlands of tropical climes. But the more we look, the more we realise dinosaurs were found in as many different kinds of habitat as are birds and mammals today. Studies of fossils in Alaska, Antarctica and Australia are showing us that polar dinosaurs, probably warm-blooded and feathery, were thriving 70–100 million years ago in great polar forests, of which there is no modern equivalent. These Arctic dwellers include the newly described pygmy tyrannosaur Nanuqsaurus and the hadrosaur Ugrunaaluk.
New discoveries, such as the horned dinosaur Spinops, continue to be made in museum collections when old fossil are reappraised in the light of new knowledge, or backlogs of plaster-encased fossils are prised open many decades after the fossils were collected. Another weird ceratopsian discovered of late was Regaliceratops, from Canada, which had a crown-like halo of pentagonal plates around its neck frill. This species is one of many ceratopsians that had outrageous headgear, with spikes and plates sticking out in all directions like abstract works of art. This extreme ornamentation is beyond anything seen in nature today.
Ceratopsians, like many dinosaurs, also had unusual life histories. Unlike birds and mammals today, they may have started to reproduce before they had reached full adult size and appearance. Living animals may not be a good benchmark for judging dinosaurs, especially the biggest sauropods, which had to grow from babies the size of chihuahuas to adults bigger than 10 elephants in a mere handful of years.
Some of the dinosaurs you will meet in this book were undoubtedly very peculiar animals. But what do I mean when I say weird? Really, I mean dinosaurs that fall outside existing stereotypes, but dinosaurs are also weird in the sense that they display some traits that are utterly unfamiliar to us in living animals today.
Obviously, the enormous size dinosaurs reached – up to 70 tonnes and 38 metres long in a newly discovered species from Patagonia – is one of the very defining traits of the group. Dinosaurs were the largest land animals ever, reaching perhaps 10 times the size of the biggest land mammals (though not the blue whale, which may weigh as much as 180 tonnes).⁵ As more sauropod discoveries come to light in many regions, from Egypt to Australia, experts are better able to answer questions about how they grew so huge, and why an evolutionary trend for gigantism existed in the first place.
While the herbivorous sauropods were rapidly growing ever larger during the Late Jurassic and the Early Cretaceous, feathered theropod carnivores were quickly evolving in the opposite direction. These relatives of Velociraptor were sprouting complex flight feathers and sequentially shrinking in size through evolution as they approached the appearance of the first bird. We can now piece together a remarkable evolutionary sequence through the 50 or so species of feathered dinosaur found as fossils. We now know that a number of very weird experiments in flight were going on at this time, too, as revealed by species such as the four-winged gliders Changyuraptor and Microraptor, and one of the weirdest dinosaurs ever discovered, Yi qi (‘ee-chee’). This species, revealed in 2015, had both feathers and leathery gliding membranes like those of a bat. Even the experts who discovered it could barely believe this species had existed.
As entire unknown and unpredicted groups of dinosaurs have been discovered, some palaeontologists have come to believe that previous estimates of the true diversity of dinosaurs have been radical underestimates. Both Phil Currie in Canada and Xu Xing in China now believe there were tens of thousands of species of dinosaur, found in every imaginable habitat on earth, much as birds and mammals are today.
Birds, for example, which are the living descendants of the carnivorous theropod dinosaurs, number as many as 10 000 modern species alone. Across the Mesozoic, the non-avian dinosaurs persisted for about 180 million years, and it is clear that vast numbers of species must have come and gone over this time. In reality, even tens of thousands of total dinosaur species may be an underestimate. The fact that we know of fewer than 2000 species from fossils means we must be aware of just a small fraction of that diversity, which is biased towards the animals more likely to appear in the fossil record.
That record is patchy, as fossilisation is a fickle and implausible process. There are many parts of the planet where fossils would very rarely be preserved, such as uplands and areas without rivers, mountains, deserts and rainforests. We are missing many of the dinosaurs from these habitats, and whenever palaeontologists can discover new fossil beds that preserve these kinds of deposits, they open up a whole new window on a different environment. This happened in north-eastern China in the 1990s with feathered dinosaurs, and similarly exciting localities will continue to be found in the coming decades.
The incredible truth about the past
Not only are we finding new dinosaurs everywhere we look, but palaeontologists now have much more advanced technologies. They are using electron microscopes to study tiny features on the surface of fossils and reveal the colour of feathers; they are applying new techniques to find traces of collagen and other organic molecules, and even remnants of tissue and blood vessels; they are studying the chemical signatures in dinosaur tooth enamel to reveal the food they ate; and they are now even scanning fossils with a technique called laser fluorescence to reveal hidden details such as skin, feathers, scales and other soft tissues. Other digital analyses are allowing tests of the biomechanics of how sauropods walked and the aerodynamics of how other dinosaurs flew.
The science of palaeontology has advanced at a rapid pace in the past two decades, but Hollywood has been slow to catch up. Many would be surprised to learn that our current understanding of dinosaurs is nothing like the creatures depicted in 2015’s Jurassic World. The most exciting new scientific developments include the fact that carnivorous dinosaurs were covered in feathers, and that we even know the colour of the plumage of some species. The new species are weirder than anything movie producers have been able to devise. We now know, for example, that not only would Velociraptor have had plumage, but it would have been decked out with fans of large feathers on its forearms, something akin to wings. We have found these large wings on the fossil of a closely related Chinese dromaeosaur, Zhenyuanlong, revealed in 2015. While no fossils of T. rex – the most iconic dinosaur of all – have been found with feathers, we know that many related tyrannosaurids, such as the 9-metre-long Chinese species Yutyrannus, were covered in downy feathers, which suggests that T. rex itself had feathers.
Many moviegoers get their knowledge of dinosaurs from films and television. Not to show dinosaurs as we now know them to have appeared is spreading misinformation. Thankfully, feathered dinosaur toys and children’s books featuring some of the unusual new species are beginning to appear and proliferate.
Perhaps the greatest crime, though, is denying people an incredible truth about the world around them – the fact that dinosaurs didn’t become extinct when an asteroid hit the planet 66 million years ago. Sadly, the supersized and wonderfully alien creatures of the Jurassic and Cretaceous are now gone, but an echo of them lives on today in the thousands of modern species we know as birds. Chances are you are pretty close to one of the 400 billion avian dinosaurs that are flitting around, soaring on thermals, feeding or roosting right across the world right now.
Join me now on a voyage around the planet and into the distant past, where we will meet a series of genuine prehistoric oddities so curious that you’d be hard pushed to imagine them in your wildest dreams…
MONSTER FROM THE CRETACEOUS LAGOON
THE SAHARA, EGYPT
In 1911, a Bavarian palaeontologist found a partial skeleton in the Sahara Desert of a very peculiar carnivore, even bigger than T. rex, and with a huge sail on its back – but a wartime bombing raid blew the fossils to pieces, and the creature seemed forever lost until an unlikely chance encounter in Morocco in 2013.
Crabs scuttle along a tidal flat near the entrance to a great braided river system that is flowing out to sea on the north coast of Africa, 95 million years ago. Apart from the insistent buzz of insects, all seems quiet along the banks, as animals rest in the shade to escape the heat of the midday sun. A crocodile the length of a bus is sleeping, its tail poking out from vegetation. But things are not as tranquil below the surface of the wide, slow-moving river channel. A fizz of bubbles hints at the presence of giant, car-sized coelacanths and lungfish lazily moving through the waters. Nearby, a more energetic giant sawfish is waggling its several-metre-long rostrum, lined with barbed teeth, through bottom sediments as it hunts for prey.
None of these fish has noticed what is stealthily gliding towards them below the water with a flick of its great tail. Made obvious above the water by a great red sail, which slices through the surface, this killer moves almost silently and invisibly through the murky waters. It is an enormous carnivorous theropod, but it has very unusual adaptations for a dinosaur – including flattened, possibly webbed feet, a barrel-shaped body, and pits along its snout where pressure sensors detect movement in the water. The only semi-aquatic dinosaur we know of, it mostly preyed upon the giant fish that lived alongside it in these Gondwanan river systems, and rarely on other dinosaurs
Our first hints of this enigmatic creature came from Ernst Freiherr Stromer von Reichenbach, a Bavarian aristocrat who undertook a series of fossil-hunting expeditions into the Egyptian Sahara between 1901 and 1911. His fossil collector, Richard Markgraf, found tantalising clues to a massive carnivore – a creature even larger than T. rex – which Stromer named Spinosaurus aegyptiacus. It had features he was at a loss to explain, such as a 2-metre-tall sail and a long, almost crocodilian jaw packed with conical teeth.
Stromer studied the fossil back at his Munich museum, but many of the pieces were missing, leaving gaps in his knowledge. All hopes of learning more were dashed during World War II, when an Allied bombing raid in 1944