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The Truth About Killer Dinosaurs (2005)
What happened when
killer dinosaurs waged war? Whose blood was spilt? And who reigned supreme? To answer these questions, a team of skilled engineers will be building bio-mechancial replicas of dinosaur weaponry. And then they'll test them. For the first time in 65 million years, the true power of these dangerous dinosaurs will be unleashed. The terrifying predator Tyrannosaurus rex squares up to the monstrous Triceratops... This is a scene that's been played out many times in the movies. But did it every really happen? And if these two dinosaurs did fight - who would have been victorious? These are questions that have been puzzling scientists ever since the dinosaurs were first discovered. And now they're using a completely new method of research to help them find the answers: biomechanical replicas of T rex and Triceratops. But however futuristic the research techniques, all investigations begin with the ancient fossil bones.... The first skeleton of T rex was found just a hundred years ago. Since then there have been about 24 more unearthed... Not one of them is 100% complete. But scientists can tell a surprising amount from the fossil bones. Like size for instance. T rex was unquestionably huge - forty foot long from head When scientists look really closely at the skeleton, they can see where the muscles and tendons attached - and so flesh out T rex. It's even possible to determine the texture of the skin, by studying impressions left in ancient rocks. So, putting together the most accurate evidence, taken from the very latest research - meet Tyrannosaurus rex... It seems certain that this iconic dinosaur was huge, and fearsome. But was he really capable of overpowering the other big guy on the block? Triceratops:, three horned face, and most famous of the horned dinosaurs. At eight tons, this would have been some heavyweight for T rex to take on. There are only three fossil skeletons of Triceratops for scientists to work on and none of these are complete. But it's obvious from its size and enormous skull that this dinosaur would have made a fearsome opponent. So Triceratops versus T. Rex. They both lived in North America at the same time but what exactly would have happened when they met? Until very recently, there was absolutely no scientific proof that they had anything to do with each other at all. But then Greg Erickson took a close look at a fragment of a pelvis from a 65 million year old Triceratops. On the pelvis he's found some intriguing wound marks... For instance, If you look here there are some gouges along the top. There's a really deep puncture mark right here. In fact if one looks all over this specimen you'll find over 80 of these punctures and cut marks. These are bite marks. Some other beast had been taking chunks out of this Triceratops. So who was the culprit? We have a real whodunit mystery. Using a common forensic technique, Greg pushes some dental putty into one of the deep wound marks to help identify the mystery diner. Aha, there we go, we have a very nice cast here of the tooth. This is a shape that is very familiar to me. This is reminiscent of a therapod dinosaur tooth and a very nice match for this animal Tyrannosaurs Rex. I think this is pretty good smoking gun evidence that T. Rex fed on this triceratops 65 Million years ago. It's often presumed that T rex ate Triceratops, but this is the first scientific evidence. Though it doesn't prove that T rex killed Triceratops. The supposedly invincible carnivore might have found this dead animal lying in its path. Was the tyrant king really capable of slaying a huge Triceratops? Greg Erikson believes that T rex's teeth were certainly up to the job. The teeth of an animal can reveal a great deal about what it was doing for a living and it's very clear that T rex was 15,000 pounds of gut crunching terror. T rex possessed some of the most robust teeth, some of the largest teeth of any dinosaur. They're recurved, there was a serrated steak knife-like edge on the back and the front. If this animal was a predator, it was probably the most lethal predator that ever lived. So how much damage could T rex do to a live Triceratops? Dave Payne and John Pennicott are skilled engineers who usually make special effects for movies: Shark Movies, Bond movies and many more. This time they're going to help the scientists to investigate the power of T rex's jaws, by building a life-size, fully working model of a T rex head. It will be based on Stan, one of only three near complete fossil skulls. The replica will be made by hand, faithfully following the proportions of the T rex fossil. The biomechanic has to be incredibly strong because the fossil evidence shows that, when T rex was feeding, it could bite through bone. So they decided to make the head from pure steel. The teeth have to be cast individually at a local foundry and are also made from steel. But the technicians need to know how much force to use to power the biomechanic's jaws. Scientists can deduce from the skeleton that T rex had huge jaw muscles. Before the team can test whether T rex was tough enough to take on a living Triceratops they need to know exactly how powerful these muscles were. Alligators and crocodiles have the most powerful bites of any living animal. They're also among T rex, s closest living relatives. Paleontologist, Greg Erikson calculates that, if he can measure the force of an alligator's bite, that measurement could be scaled up to get the force of a T rex bite. So, Greg hitches a ride with the Florida Alligator Control who are hoping to catch a rogue, gator that has been making a meal of the local dogs. Crikey, she's a fine one! Greg's caught a whopping 12ft animal, weighing around 450 lbs - that's the same weight as 3 men. This wild rogue alligator is the perfect subject for Greg's bite test. All he has to do is insert the biteometer where it counts. Actuality- bite test, 2,209 bite... 1 Ton. So now Greg can scale up that one ton measurement to work out how strong the bite of a T rex would be. We're close to release, everyone ready? After 3 months of painstaking engineering and careful scientific calculations, the bio-mechanical T rex head is ready to test. Based on his work with alligators, Greg has calculated that T rex would have had a bite force of at least 4 tons. The bone would've had to been so strong that the only way to replicate it is by using steel. And the enormous muscle power is provided by a hydraulic piston. It's time to test true strength of the jaws.... This is just part of a cow's leg bone. T rex had the strongest bite of any animal ever known. Eight times more powerful than a lion. Four tons of brute force completely pulverises the bone. This dinosaur could certainly have delivered a killer bite. The bio-mechanical bite test doesn't prove that T rex really did attack Triceratops. But amazingly, the fossil evidence does exist... John Happ has some more fragments from a Triceratops, this time dug up in Montana, USA. First a fossil of a damaged horn... When we first found the left brow horn we were disappointed because about a 1/3 of the horn is missing. These are bite marks.... ... the end of the horn was bitten off. The shape of the teeth marks proves once again that the culprit could only be T. Rex Bite marks alone still don't prove T. Rex attacked Triceratops. But John has noticed something else. We found some additional bite marks. A line made where T. Rex's tooth raked into the frill. But there is something strange about this line. Where you might expect a clean-cut groove from the tooth - there is an unusual ridge. And when John x-rays the ridge the incredible truth is revealed. You can see at the first score mark an area of dense bone. This is an indication that the bone re-healed. The bone re-healing is the crucial evidence. It proves that Triceratops was attacked by T. rex while it was alive. Triceratops must have survived for long enough for the wound to heal. It's the first time scientists can say for certain that T rex wasn't simply a scavenger - because they know that, at least on one occasion, it did attack Triceratops. They know that T rex grabbed its horn..... and broke it... They also know that T rex grabbed the frill of the same animal with enough force to crunch through bone. But there is still much more to discover about the relationship between these two heavyweights. If T rex ambushed Triceratops he would have had to been quick. So how fast could T rex run? He's been depicted as everything from a lumbering hulk to an animal that can out pace a jeep. Some have even speculated that these legs could power him up to 45 mph. So what's the truth. ? Jim Farlow of Indiana University is investigating one of the world's finest collections of footprints of meat-eating dinosaurs. Here's a real nice one right here, starts out here with a left footprint and then we go here to the next right footprint and beyond here is another left footprint of the same animal. By measuring the distance between the footprints, Jim can calculate how fast this dinosaur was moving... Well judging from the length of the stride, l, d guess that this beast is moving at a fast walk... maybe 7-8 mph which is sort of a fast jog for a human being. So can these footprints help scientists to work out the top speed of T. Rex? Well there's a problem because T rex was much larger than the dinosaurs that left these prints. Now if we had a tyrannosaurus stride.... and if we start at about where that footprint is... the same foot would now come down.... going to be about here. And that's just a walking stride... So you can see in order to encompass the entire length of stride of a running tyrannosaurus - you're going to have to have a very big surface and it might be hard to get one that large. In fact no footprints of a running T. Rex have ever been found... So to consider how fast a tyrannosaurus could run, we may have to use something other than footprints. John Hutchinson is studying the way animals run at the Royal Veterinary College in Hertfordshire, England. He's trained Sharon the ostrich to work-out on a running machine. And she's helping him work out how fast T rex might have run. Ostrichs, legs are very similar to T rex, s... pretty skinny with long tendons stretching down to the toes and all the muscles piled up at the top. Look at this ostrich.... an ostrich can run faster than any human. How does it do that? Well it has huge leg muscles about 15% of the body weight in this ostrich. Those muscles produce a lot of force. In fact they can power Sharon's legs up to an impressive 40 miles an hour. These leg muscles help the leg work like a spring and the body is acting like a great weight that is bouncing up and down on those springs... much like a pogo stick. That's what makes the ostrich such a fast animal it's pogo stick-like legs and big muscles. So, could T rex run as fast as an ostrich? By scaling up from Sharon, John has worked out that to run at 40 miles an hour, T rex would have needed muscles as large as this.... simply impossible. Clues from the bones suggest that it probably had muscles much more like this. So T rex was definitely slower than an ostrich. We figure from our calculations that a T. Rex might be able to move as fast as 25mph maximum, probably a bit less than that. It doesn't sound that fast but it's as fast as an Olympic sprinter and those speeds aren't bad at all for an animal that big. 25mph if you saw a T. Rex going that fast would be very impressive. T Rex could run faster than most humans, but could it run faster than Triceratops? Triceratops was built rather like a sumo wrestler and its short front legs would have made big strides impossible. John Hutchinson has calculated that Triceratops could run no faster than 15mph. So now its obvious as to who would catch who. But is it? Triceratops had one more trick up its sleeve... Scientists are comparing the agility of the two dinosaurs using a rather unconventional experiment on the salt flats of Utah. Dave Carrier has discovered there is a downside to being a 40-foot long T rex running on just 2 legs. The problem that T-Rex had is that the legs were in the middle and they had a long body, head and neck out in front and then a long heavy tail out behind. T rex has a pivot in the middle with a considerable amount of weight spread out on either side. Triceratops, on the other hand had all its weight centred solidly above four legs. So who had the advantage when it came to a chase? Well, this experiment requires a certain amount of imagination.... Dave's the Triceratops, his student is T rex. In the pack on my back is twenty six pounds the same weight as the T-Rex behind me is carrying. The difference in the T-Rex the weight is a metre in front of the legs and a metre behind the legs, in my case l, m much more similar to the triceratops, in that the weight is carried close to my back. If we were to run, straight ahead as we're doing now the T-Rex has no problem tracking me. If I were to turn in a gradual arc the T-Rex could track me perfectly fine. However watch what happens on the second or third turn. First turn to the left.... To the right.... Left.... Triceratops is gonel T. Rex's body shape put it at a serious disadvantage. It would have been a lot better off if it could have reduced the weight at the front end... Perhaps by losing those huge teeth? Or reducing the size of its head? Obviously T-Rex can't change its anatomy, if it had it would no longer be T-Rex. After all it's the big head and big teeth that give this superstar its Rex appeal. So what, realistically, could it have done to improve its agility? The one thing it might have been able to do is change it's posture when it was running. So what we're suggesting for T-Rex, that instead of running with the head and neck stretched out horizontally they would have actually pulled their neck back into an S shape. They may also have raised the tail up off of the horizontal to an angle above the ground. Both of these changes would have greatly increased the agility of T-Rex But speed and agility aren't the whole story... If T rex was clever enough, he might have been able to plan his attack and outsmart Triceratops. But to investigate that theory scientists would have to look inside its brain. Impossible? Scott Rogers doesn't think so. He's one of the few people in the world who has tried to get into the mind of a dinosaur. One of the most difficult aspects of studying the behaviour of an extinct species is trying to find its brain. The problem with the brain is, is it tends not to fossilise. Instead it tends to rot. Up until now all scientists had to work on were the mud filled spaces inside the skull where the brain used to be... the endocast. But Scott had an ingenious idea - to look inside this endocast using the latest medical scanner. He wanted to see if there were any traces of the brain left behind in the fossilised mud. What we found was something quite extraordinary. For the very first time we are really looking at material in here that we believe reflects the actual structure of the brain. The white, blobby mass reveals the true shape and structure of a dinosaur brain, for the first time ever. When Scott compared the shape of the brain with the brains of other animals, he made a fascinating discovery. By comparing that with modern species what we find is that brain resembles very closely the brain of an alligator. If T rex's brain was similar to an alligator, s, then this provides a clue to how T rex behaved. An alligator's thought process is extremely simplistic. If it smells something that it thinks is a food item it turns to it, hits it swallows it and that's then end of it. It's not going toss it around think about well maybe I should've attacked it. May be I should have picked at it. No it's going to immediately respond and have a very distinct behaviour. Just like an alligator, T rex would sense something and go after it. No questions asked. But what about Triceratops - would it have been able to outsmart T rex? If we look at this model of a Triceratops what we find is something strikingly different. In this case we see that the brain size, which would be right in this region, is almost the same size as the spinal cord region. What that tells us is as sensory information came into the brain it basically went straight through. So no time for thinking - Triceratops was even more stupid than T rex. It probably did very, very little when a tyrannosaurus came up, it would protect itself, it might charge but it had a limited ability to respond. He might have been stupid, but the fossil evidence confirms that Triceratops did survive an attack by T rex. So the lumbering 3-horned vegetarian must have been able to fight back. The horns look like highly effective offensive weapons. But how exactly did it use them? Andrew Farke, from Stony Brook University, New York, is an expert on horned dinosaurs. It's very easy to think that perhaps Triceratops, when it was confronted by a hungry T. Rex, something that was threatening it, that it would have immediately charged and tried to use it's horns with all the force it had. A modern animal that charges just like this is a rhino. It has a sharp horn and when it's provoked, it'll charge at full pelt, using all its weight to ram its opponent. So at first glance it definitely might appear that Triceratops was charging like a rhino. This is a theory that has never been tested. Until now. To find out exactly what kind of damage a charging Triceratops would have inflicted on T rex, the crew of bio-mechanic experts set about building a life size replica of a Triceratops skull. The model makers began by examining a cast of an existing fossil. But to create a true replica, the they had to find a material that had the same properties as the original bone. They tested 20 different combinations of resin composites before they found one that had exactly the same tensile strength. It was important to make sure that the model behaved just like a real animal in an impact. The team of experts worked for months to meticulously prepare for the bio-mechanical test. Finally they have an accurate model of the skull built from a specially developed resin composite. They have a top charge speed of 15 miles an hour. And they have a weight for a Triceratops of 5-8 tonnes. And now they are ready for the test - a crash test. Here in this hanger they normally in crash test cars. But this time its dinosaurs. This is a unique experiment on a truly spectacular scale. This is about as close as we could possibly get to what a real Triceratops skull would have been like in life. This whole thing is mounted up on this apparatus - its going to send it barrelling down here and then run smack into our simulated T rex. The T rex stand in doesn't look much like T rex but it has all the qualities of T rex. The muscle and flesh is represented by crushable honeycomb aluminium. This is covered by the, T. Rex skin, - made from thin sheet aluminium and leatherette. For the first time ever, this bio-mechanical experiment is going to reveal what would have happened if Triceratops charged at full speed into the belly of T rex. The skull clearly wasn't strong enough for Triceratops to charge like a rhino and ram T rex.. In slow motion we can see what happened. The sharp, narrow horns sliced easily through the simulated T rex but the broader beak and nose couldn't cut through the flesh and muscle. Forces built up to 6 tons and the Triceratops's skull started to fail - fracturing at its weakest point. This would have meant certain death for the colossal vegetarian. So its back to the drawing board to find out how Triceratops could have survived an attack by T rex. But, the outcome of any predator prey battle is often determined by who sees who first. So how well could T rex see? The size of the eye socket suggests that the eyeball was about the size of a grapefruit, with plenty of room for the sensors needed for fairly sophisticated vision. Good eyesight would have been very useful when it came to hunting down Triceratops... Kent Stevens has been using laser measurements to investigate the link between the position of T rex's eyes and its behaviour. Modern predators, like cheetahs who chase down their prey, have eyes right at the front. This gives them good 3D vision and a better ability to track their prey. When Kent measured the eye position of T rex, he was surprised at what he saw. In the case of T-Rex, I didn't see just a very large reptile; this is closer to like a wolf, The snout drops down... relative to the plane of the eyes, it becomes narrower... so this could look down and over its snout providing a very broad field of view ahead of it. The position of T rex's eyes gave it good 3D vision, like that of a modern hunter - so it was well able to actively chase down Triceratops. So how well could Triceratops see him coming? Modern animals that need to keep on the alert for predators have eyes on the sides of their heads. Kent could see that Triceratops was just the same. It had side-mounted eyes to keep a lookout for potential killers. But it also had blind spots.... This whole structure here, part of the support of these horns, obscures forward vision. Another thing is this large frill; this large frill produced a very large blind spot behind the animal. It could have compensated for it partly by swinging its head from side to side so it could look over one shoulder or another at a time. It was a potential vulnerability that a predator could certainly have exploited. If Triceratops was attacked by T rex it would have had to defend itself. But how exactly did it do that? Andrew Farke, the Triceratops horn expert, has a new theory. He's been re-examining some triceratops fossil skulls and has found some tell tale wound marks that no one's noticed before. Perhaps there's a little bit of bone that's missing, in front of the eye. On the cheek you might find an odd hole, ... in some specimens there are abnormalities on the frill. And from the shape of the marks he can tell what caused the damage... Triceratops going horn to horn with each other. Now we know for sure that Triceratops was using its horns against its own kind, its very likely it was also using them against T rex. Triceratops didn't use its horns to ram T rex so it most likely used them like this - flicking its head to gore its attacker. Potentially lethal. But an attack by T rex's jaws would have been just as brutal. Greg Erikson has been investigating exactly how T rex attacked its victims. I think the best analogy that can be made for the feeding of T rex amongst living animals is the great white shark. This predator doesn't just crunch on flesh and bone, but rips out great chunks of its victim. Greg has found evidence on his fossil Triceratops pelvis that T rex behaved just like the shark. What you see is this animal bit down into the bone and then pulled backwards removing large chunks of bone and leaving a furrow behind. Now if we look at t a bite mark that is made by the Great White Shark, such as this mark here, that was made on a whale vertebra, we see almost the exact same pattern. The tooth was pushed down into the bone here and pulled across leaving a furrow very much like what we see on the Triceratops pelvis. Using the steel T rex head, the bio-mechanics team are going to find out what kind of effect this brutal bite would have had on Triceratops. And their stand-in for Triceratops? A side of pork. To reproduce the ripping motion, they're going to use an industrial strength forklift. Just like a shark, there were two distinct parts to a T rex bite. First, the deep penetrating crunch through flesh and bone And then, using its full body weight, T rex pulled backwards, ripping through the flesh. A devastating attack. The experiment proves that T rex would have been able to bite off 330 pounds of meat in one go - about the weight of two men. But its doubtful that it could have swallowed that amount. By examining the skull of T rex, scientists have concluded that it would have been able to swallow a chunk of meat about the weight of an entire pig. Now they've built the bio-mechanical T rex head, the team are keen to test it to the limit.... Just for fun, they want to see how a twentieth century icon stands up to an icon of a very different era... The force of this bio-mechanical bite is no greater than the force of a T rex bite, as calculated by the scientists. So - who would have had the advantage when T rex hunted Triceratops? What's the evidence? T rex was certainly superior when it came to eyesight - it had excellent vision. Whilst Triceratops had a crucial blind-spot. T rex could run quite fast on a straight run but its body shape gave it serious problems with manoeuvrability. Triceratops was slower, but much more agile. T rex had formidable weapons with its powerful jaws and huge, serrated teeth But Triceratops could fight back - using its horns to gore its attacker. The evidence suggests an even match - and at the end of the day it may well have been a case of which one was the first to make a mistake.... Using all the data from the research, and the biomechanical tests, it's now possible to finally and faithfully recreate the titanic confrontation that might well have happened, 65 million years ago.... This impressive vegetarian has proved to be a formidable opponent. One false move by T Rex, and the consequences would have been fatal In the next programme - the truth about the two-legged meat-eater, Velociraptor. It was much smaller than T rex but no less terrifying. The technical team will build another life-size bio-mechanical model to find out exactly how this killer dinosaur used its legendary disemboweling claw... And all will be revealed about its gruesome secret. In prehistoric times dinosaurs were engaged in a constant battle for survival. And dinosaur wars determined who would live... and who would die. In this programme scientists will be investigating how a dinosaur the size of a small car would have stood up to the lethal claw of a turkey-sized animal with attitude. And a team of biomechanic experts will be building life-size replicas of dinosaur weaponry. They'll discover who killed who, 75 million years ago. The prehistoric plains of Mongolia were home to several different kinds of dinosaur. But one of the nastiest was a blood-thirsty two-legged meat-eater called Velociraptor. In the movie, Jurassic Park, Velociraptor was 6 foot tall with a vicious claw that could rip through flesh. From then on he was stuck with an evil reputation. But how much of this is true? In reality, Velociraptor was considerably smaller than in the movie, and its appearance was very different... For a start Velociraptor had feathers! Scientists also know how it behaved... They've discovered what it could kill - and precisely how it killed. And the truth is just as terrifying as the fiction. Paleontologists have only ever found one, nearly complete, fossil skeleton. But the bones betray the first indisputable fact - Velociraptor was only 2 and a half feet tall. And like all two legged carnivorous dinosaurs... ... Velociraptor had many similarities with a bird. Phil Manning is in charge of dinosaur fossils at the Manchester Museum, England. But today he's dissecting his turkey dinner. Let's strip away some of this meat and I will prove to you that birds and dinos are closely related... This is the wishbone and this is something you always expect to see in a bird, it's a very, very clear bird character. The wishbone behaves like a spring and gives the wings or in Velociraptor's case, arms, extra power. now there you go - I call this not a wing but an arm. You can see the sort of lower arm bones... And this is the hand, you can see one of the fingers here And there are 2 other finger bones here - they are fused together. This is something that's left over from when this was once, or its ancestors were once a dinosaur. The similarities with Velociraptor are obvious. Feet, you can just by looking at the form, structure, the number of bones present in the foot... it screams dinosaur at me You can see the scales look very reptilian but by the time you get to the top of the foot here you can see little feathers sprouting... cos all feathers are, are just highly evolved scales... When the idea that dinosaurs sported feathers was first suggested it was considered so unlikely that many scientists refused to believe it. But then the irrefutable evidence was discovered in China. In 1986 fossil hunters discovered, an extraordinary fossil of a small predatory dinosaur. Every detail of its body had been left behind as indentations in the rock. When they looked closely, they could see a dark line running from head to tail along its back. The incredible truth dawned on them... this dinosaur was covered in downy feathers, just like those on a young bird. Then, in the year 2000, local farmers in China made a breakthrough discovery with Dave, the Fuzzy Raptor. He had much more sophisticated feathers, just like those on the body of an adult bird. The evidence is clear - the raptor family had feathers, and that of course includes, Velociraptor. So if he looked very much like a bird, how did he behave? Velociraptor's reputation as a fearful killer is almost entirely due to its very unusual, and decidedly lethal-looking, curved claws. Alan Gishlick is an expert on raptor claws and he's keen to discover what they were used for. When paleontologists found the first one as recently as the 1960, s, there was a frenzy of excitement. When they discovered this they forgot about the rest of the animal. It was different from any other type of claw we, d discovered on a dinosaur so far, When Hollywood and, in particular, Stephen Spielberg saw the claw they jumped to a dramatic conclusion. Because it was so thin and shaped like a scythe it immediately made people think about a slicing action or a cutting action and led to the idea that this was used to disembowel prey. The raptor was immediately cast as a scary villain, complete with lethal weapon. You imagine this animal's creeping up on a prey and jumping on it and slicing its guts open and blood everywhere. Excites the imagination, makes school kids shiver and looks good on TV and film and movies. So what's the truth? Up until now theories about what the claw could do have all been based on speculation. But that's about to change... Dave Payne and John Pennicott usually make models for movies. Bond movies, shark movies, they've done them all! This time they're going to design a world first experiment to reveal the power of the claw once and for all. Their challenge is to build a fully working replica of Velociraptor's leg. Look at the size of the muscle attachment there must have been a big muscle there The project will take months First, scientists have to advise the team on how strong the leg would have been. By looking at where the muscles attached on the fossil bones, they can determine the size of the muscles and hence the kicking power of the leg. It had roughly the strength of a human arm. Now that doesn't sound a lot but when you actually add that up to that being kicked at an animal, there is an immense amount of force being transmitted through that tiny little claw. To reproduce the correct muscle strength, the effects team use hydraulic rams. Then they have to recreate the action of the claw. You can see clearly the claw here has got this huge knobble of bone that would have had a massive tendon attachment running underneath this toe so that when the animal wanted to pull that claw down rapidly, it could be whisked through 180 degrees. The exact replica of the claw, made out of resin, has a very sharp point, but the underside isn't sharp at all. Will this really be able to rip through flesh? They'll only know for sure when the model is built. In the meantime, scientists have detected other clues in the fossil bones... that shed light on the true nature of Velociraptor. Phil Manning believes that it had all the hallmarks of a vicious killer. The skull is exquisite - extremely bird like, but one of the most striking features has to be these backwardly recurved serrated teeth - would have been wonderful for slashing into their prey. These would have been like razor blades as the animal buried its face into its prey using its body weight, hanging back on these hook-like teeth ripping through flesh. This would have been a devastating weapon. So it had meat-eating teeth... long, strong runners legs... And it also had a disproportionately long tail. Long thin tails can be very useful in the chase for prey. Cheetahs, for example, use their tails as counter balances to help them track their victims. And Velociraptor would have used its long tail like this to help him quickly change direction. This dinosaur also had an added advantage that most land predators don't have... its feathers. They weren't used for flying - they most probably evolved to keep the dinosaurs warm. But the feathery arms would have acted like a birds wing. A bird in flight uses its wing to steer and change direction. Velociraptor would have used its feathers in the same way, but on the ground. This might look odd, but not half as odd as these ostriches using their wings in a similar way - but its likely that Velociraptor was rather more elegant! So Velociraptor looked like a bird - had teeth - and by making use of its feathers, and its long tail, this dinosaur was super agile as well as fast. It was clearly well adapted for hunting down prey. But how did kill its victim? Did it really use its claw to rip into the flesh and disembowel the guts of its prey just like in the movies? Up until now scientists have only been able to speculate but for the first time in 75 million years, they are about to find out. After months of painstaking research and meticulous engineering, the bio-mechanical model of a Velociraptor's leg is ready to test. Whoah, that is awesome Dave Phil Manning joins the technical team to make sure that everything is scientifically accurate. Well this is our Velociraptor. You've got the dimensions just right. This is the femur up here is that right... the upper leg bone, That certainly is... lower leg here. You've got the rotation on this claw. That's incredible... An amazing adaptation to have the claw held up of the ground to rotate round like that. Must help keep this very sharp. The leg is a beautiful piece of craftsmanship but can it pull a punch? It looks right, but what about this claw? Can you get it cranked up to full speed? Yeah its gonna get a bit noisy but I'll go away and start the pump and you let you have a look OK lets see it go then The scientists have calculated that Velociraptor's muscles could power its leg about as fast as a human arm. Alright come back over - it works, But I still have a problem with this claw, I can't see how it functions. Is there a way we can work out what damage this could do? Let's test it. OK l, m on for it - what have you got? Bit of Chamois leather. That's pretty flesh-like. Let's get the chamois leather then. It's time to test the legendary claw to see what it's really capable of. Chamois leather is about as tough as human skin. That is fabulous Wowl look at that Alright - its ripped it... but... I think look at the thickness of chamois leather and there is nothing behind it. I think we have got to test this further This is quite a feeble test It is a feeble test. I think we need to crank it up to the next stage... that bit of flesh... What do you reckon? Some pork Pork would be good. I think lets see what happens when we shove that thing into it at speed Cutting through skin appears to be no problem, but in life, skin is attached to fat and muscles so the team decide to use a more realistic challenger in the form of a pork belly. Only slightly tougher than your own belly, as it happens... An accurate experiment like this has never been attempted before. Anticipation That is gross. Come on over and have a look at the damage... Lets have a look Just look at that... it has not disembowelled our dinosaur... Its punctured it, it's a foot hold... Its hooked right in Absolutely this is definitely not for disembowelling, this claw The end of the claw was obviously sharp enough to pierce the flesh, but it couldn't cut through the flesh because the underside is round and completely blunt. It seems that Velociraptor wasn't capable of disembowelling its victims. So what exactly did Velociraptor do with that claw? The answer lies in an incredible fossil found in the Mongolian desert. This is where Velociraptor stalked his territory, millions of years ago. One of the most common dinosaurs of the time was the vegetarian, Protoceratops. It was about the size of a pig and would have made a tasty meal. In 1971, a Mongolian palaeontologist stumbled across a Protoceratops skull. This skull led him to the most extraordinary dinosaur fossil ever discovered. Caught in the mouth of the Protoceratops, he found the arm of a Velociraptor and amazingly there was much much more... What he had found was a fight between two dinosaurs - frozen in time... Almost all the bones of both animals were intact, and in exactly the same position as when the attack was taking place. This extraordinary fossil has endured for 75 million years. And the, Fighting Dinosaurs, are still locked in mortal combat. No-one knows how they both died, at exactly the same moment in time. Some scientists think that, whilst the animals were distracted mid-fight, they were covered by a mudslide. Others think that they could have been suffocated in a monster sandstorm. What everyone can agree on is that this is a battle scene. Dave Unwin, from Humbolt University in Berlin, believes that the fighting pair fossil is the conclusive proof of how Velociraptor used its claw. He's worked out exactly what was going on, out on the desert. Velociraptor has seen Protoceratops from somewhere way over here and come running over he's grabbed hold of Protoceratops, and we can see very clearly the tension and the energy in this struggle. Look at the curvature on Protoceratops as he tries to pull away from Velociraptor and look also how Velociraptor's body is curved right round as he tries to pull his prey towards him and kill him off as quickly as possible. and its just incredible its captured in the fossil record and preserved like this for millions of years. Dave now turned his attention to the curved claw. Did it have a specialized use? When he looked really close he began to realize that Velociraptor was even more deadly than its reputation. It wasn't stabbing the prey in, in any old spot, it was actually stabbing this protoceratops in one of the most vital parts of the body, which is the neck region. Stabbing into the neck gives a predator a good chance of cutting the windpipe or piercing the jugular vein. If you cut the veins in my neck l, d bleed to death literally in seconds or minutes. Or alternatively if the Velociraptor was lucky enough to cut through the windpipe the animal would suffocate in literally two or three minutes. Velociraptor is exposed as a ruthless viciously equipped killer. And scientists know exactly how successful it was because countless numbers of Velociraptor teeth have been found among the fossilized remains of its victims. But there's a conundrum - Velociraptor was no larger than a turkey. So what was the secret of Velociraptor's success? One theory has it that this turkey-sized predator was hunting in groups. It's difficult to prove whether Velociraptors were hunting together when they lived 75 million years ago. But one way scientists can theorise about the behaviour of dinosaurs is to study the behaviour of their closest living relatives - birds and crocodiles. Crocodiles are scary enough on their own, but sometimes they work together. The advantage is that they can take on much larger prey. One croc would have problems with a fully-grown zebra, but many jaws make light work. The first crocodile pushes the unfortunate animal into deep water, where it is well out of its depth. A second crocodile moves in to join the party. It's all over in seconds... with plenty of zebra dinner for both killers. Collaborative hunting works for crocs. But what about those other dinosaur descendents, the birds? The hunting methods of these birds of prey could provide an insight into how Velociraptor was such a successful predator. Steve Ford is one of Britain, s most experienced Falconers. Usually he works with a single bird, but not when he's hunting with Harris Hawks. One of the good things about Harris Hawks is the fact that they are gregarious and they like to work as a family group so therefore they are ideal in the hunting field because they'll actually work as a team. So it's nice to have a variety of birds here, males and females, immatures and adults, all raring to get going to get out into the hunting field. These are tame birds but they're not trained birds - they're displaying their natural hunting method which is not to go out on their own looking for prey for each one, but in groups. Three birds stand a much better chance of catching one prey - in this case a rabbit. What we're doing is we're working this wood and we've got one female... that's gone right up front... she's the more experienced one. and we've got... back in this area... and we always end up when we're working with a group of birds like this that we end up with a backstop The backstop stays behind in case the rabbit decides to double back on itself. Go on hawk In goes the first bird. There is... The second flies in to cut off the rabbit. Go on... And they've got it. So co-operative hunting pays off for Harris Hawks and perhaps also paid off for some predatory dinosaurs. Working together, the turkey-sized Velociraptors would have had a much better chance of bringing down one, rather sturdy, Protoceratops. And there is fossil evidence that suggests that they did just this. In the 1960, s, palaeontologists were digging in the side of a hill in Montana USA when they found the remains of 4 raptors, lying alongside their victim. The evidence was undeniable. These raptors were hunting together. In prehistoric Mongolia, a Velociraptor gets into position up on the high ground. While a second one sets off down onto the low ground. And they're off. Velociraptor most certainly lived up to its billing: a ruthless hunter and a vicious killer It might not have been six foot tall, and it couldn't actually disembowel its victims. But Velociraptor could most certainly use its sickle shaped claw as a lethal killing weapon. a whole pack of these ravenous predators could attack and kill whatever they wanted to eat? Or could they? The biggest potential meal for Velociraptor that lived out on the desert was one of these - an Ankylosaur. This huge dinosaur was a vegetarian with a very small brain. Surely this docile, and probably dozey, animal was destined to be made mincemeat of by a hungry Velociraptor? Or perhaps it could look after itself. The tail is suspiciously lumpy and the animal is covered in thick armour. So what would have happened if a gang of Velociraptors set out to attack an Ankylosaur... This is a question that's been intriguing Ken Carpenter. Ken is curator of the Denver Museum, USA and a world expert on Ankylosaurs. I like Ankylosaurs because they are so different among dinosaurs - they have very low, squat bodies - in one sense they are almost built like me so I can kind of relate to them. They probably had a short temper, they weren't very bright, but they were plant eaters and so they might have been rather gentle animals. Gentle animals maybe - but what about that tail? The bulbous club on the end looks like a weapon - and palaeontologists have often described it as a weapon but did it really pose a threat to Velociraptor? It's time for another dinosaur experiment. The special effects team embark on a new challenge - to build a fully working, replica tail from aluminium. To date fossil hunters have only found 8 Ankylosaur tails. But Ken has tracked down a cast of one of them so that he can advise the team. The tail has two parts: the flexible bendy bit and the solid club on the end. This is the tail club, this is the business end of an ankylosaur. It's made by vertebrae which are fused together to form a handle - the true working end are these plates of armour that are fused together - forms almost a battle axe. When Ken takes a really close look at the fossil cast, he makes an amazing new discovery. We're very fortunate with this, something that we've never seen before is the damage that occurred on this tail club where the bone had broken off and that could only have happened if the tail club had hit something really hard. It hit with such force that the bone just popped off here. It didn't only do it once but it did it twice which suggests that the animal had struck something really hard in both directions... This provides us with the best evidence that this was indeed used as a weapon. If this is a weapon, what kind of damage could it inflict? And what would it do to a Velociraptor? Back in London the special effects team sets about building a replica aluminium tail. This has an equivalent weight and the same strength as the original tail. Before they can test it, they need to know exactly how much force an Ankylosaur could put behind its tail swing. While the team are busy building their scale model in the UK, Ken is busy in the US - doing maths. Here in front of me I have the tail that we used in our analysis. We have all these structures on the side and along the bottom - this is where the muscles attach. So we could determine the volume of muscle all around the tail. And from that volume we could then calculate the amount of force that the tail club could generate and it turned out it the tail club could generate about two and a half tons per square inch which is about the weight of a car on a very, very small area. You can imagine a predator coming nearby and Ankylosaur swinging this club - its going to do a lot of damage if it hit a vital area. Two and a half tons is an awful lot of pressure on a small spot on any carnivorous dinosaur. Up until now, scientists could only guess as to what kind of damage the club-shaped Ankylosaur tail could inflict. But with Ken's calculations and the special effects team's replica tail, they are finally able to put a 75 million year old weapon of war through its paces. Ken has flown to London to witness the experiment. Here's our tail, what do you think? Wow this is marvellous - looks just like the real thing. We're pretty pleased with it Its very impressive. So how much force did you calculate for this. Two tons a square inch, like your figures. OK so that's about the weight of a large American car on a pretty small area. a pretty large car. Explain to me how this thing works? OK, we pull it back... and lock it into this release mechanism here and then when we release the tail the weight falls, pulls the tail round and applies the force to whatever we're going to hit. Well let's see this thing work... Great, that's marvellous, just like the real thing! With the tail working exactly as they planned, Ken and the team are about to find out what kind of damage an Ankylosaur tail could have inflicted on an attacker. The target is set in place - yet another piece of butcher's pork. This rib cage is designed to be strong enough to protect the animal's internal organs. Wow look at that... right through, that's amazing. Just shattered those ribs oh man... l, d sure hate to be hit by that thing! The experiment proves that the ankylosaur was brandishing a deadly weapon. But would it have used it against a turkey-sized Velociraptor? However scary Velociraptor was, it was only two and a half feet tall. Ankylosaur's tail force seems well over the top. Scientists have concluded that the gentle giant must have had to fend off something much more formidable. Velociraptor wasn't the only predator at large on the pre-historic plains of Mongolia. In the forests surrounding the open scrub of Ankylosaur's home lurked another even more impressive killer dinosaur: Tarbosaurus - a Mongolian equivalent of T rex with jaws that were just as powerful. As the special effects team prove, the bite of such an animal would have been devastatingly destructive. If Tarbosaurus could have crunched through metal Ankylosaurs armour would have been no problem. But would the Ankylosaur have been able to fight back? Phil Manning thinks there are clues in the fossil evidence that the vegetarian could successfully defend itself against Tarbosaurus. There are examples of lower legs on shins of predatory dinosaurs that have almighty blows kicked into the side of them. Now it's quite possible that such injuries could have been caused by the huge tail club on the end of an Ankylosaur. So what damage would an Ankylosaur tail do to a Tarbosaurus leg? The team use a piece of timber as a stand-in - it is the right size and has the same strength as bone... If an Ankylosaur tail club could have seen off a gigantic Tarbosaurus, what would it have done to a diminutive Velociraptor? Velociraptors were actually rather small. Probably about the size of a turkey. For the biomechanical test, Ken has provided an oven-ready version as a stand-in. And Dave is standing by to release the tail. So let it rip... Giggle... Look at that thing, oh my god. Poor thing, probably broke all of its ribs, ruptured the internal organs. If this had been a Velociraptor it would be dead. It's possible that a sprightly, feathered Velociraptor may have been agile enough to avoid being hit. But if did get close, it would have the been faced with the Ankylosaur's heavily armoured skin. Alligators and crocodiles are distant relatives of Ankylosaurs and they are similarly armoured. Their skin is incredibly tough and resilient to any kind of attack. So scientists have questioned whether Velociraptor's curved claw could have penetrated the heavily protected Ankylosaur. There was only one way to find out. Dave Payne, the biomechanic expert, constructs another Velociraptor claw test. First he secures the target - an imported piece of crocodile from a farm in Australia. Then he prepares the Velociraptor leg for action... This is what it did to a piece of pork... Now the croc skin... Amazingly the claw simply bounced off leaving hardly a scratch. Not only that - the force of the claw hitting the bony skin broke off its tip. The conclusion is that Ankylosaurs were impenetrable battle tanks. And Velociraptor didn't stand a chance against that thick armour. But there's one final twist to the tale... Dino Frey is an expert on alligator and crocodile armour and he's discovered that Ankylosaurs may well have had a weak spot after all. I am a biologist and I work with living animals. And these living animals help me to explain extinct animals. Today he is researching alligators and crocodiles in Florida. But before he can study them, he has to catch them. Now you can see... you see the amour. Dino's expert eye has noticed something intriguing about the crocodile skin. In all crocs there is this armour, but interestingly the babies don't have armour, and especially in the neck where you would expect protective armour against neck bites from other predators, the armour is reduced. On the young crocs, the defensive armour isn't yet fully developed. So the small crocs are much more vulnerable to predators and there is evidence that a heron can harpoon a little croc without any problem but it would break its beak if it tried to do the same with the big guys here. Ankylosaur armour was so similar to crocodile armour that scientists reckon its fair to assume that baby Ankyosaurs would have been just as vulnerable as baby crocodiles are. Sure enough, in Mongolia palaeontologists have found fossils of twelve young Ankylosaurs. And amongst the bones were the telltale and umistakeable teeth of... Velociraptor. These defenceless baby Ankylosaurs would have provided an ideal meal. Using all the evidence from the fossil bones, and from the bio-mechanical tests, its now possible to reveal Velociraptor at its most ruthless. The facts prove beyond doubt that Velociraptor does deserve its scary reputation. Quite different from how the movies depicted him, but an extremely vicious killer all the same. |
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