http://www.sciencedaily.com/news/fossils_ruins/tyrannosaurus_rex/ Tyrannosaurus Rex. Read about skeletons of the oldest T Rex ever found, gigantic meat-eating dinosaurs and more. Pictures too. en-us Wed, 15 Feb 2012 18:05:02 EST Wed, 15 Feb 2012 18:05:02 EST 60 http://www.sciencedaily.com/images/logosmall.gif http://www.sciencedaily.com/news/fossils_ruins/tyrannosaurus_rex/ For more science articles, visit ScienceDaily. http://www.sciencedaily.com/releases/2011/12/111207132918.htm New research has unveiled enormous bones from North America's biggest dinosaur. Researchers collected two gigantic vertebrae and a femur in New Mexico. The bones belong to the sauropod dinosaur Alamosaurus sanjuanensis: a long-necked plant eater related to Diplodocus. The Alamosaurus roamed what is now the southwestern United States and Mexico about 69 million years ago. Wed, 07 Dec 2011 13:29:29 EST http://www.sciencedaily.com/releases/2011/12/111207132918.htm http://www.sciencedaily.com/releases/2011/10/111014212405.htm A meat-eating dinosaur that terrorized its plant-eating neighbors in South America was a lot deadlier than first thought, a researcher has found. Carnotaurus was a seven-meter-long predator with a huge tail muscle that paleontologists say made it one of the fastest running hunters of its time. Fri, 14 Oct 2011 21:24:24 EDT http://www.sciencedaily.com/releases/2011/10/111014212405.htm http://www.sciencedaily.com/releases/2011/10/111012185634.htm A new study reveals that T. rex grew more quickly and reached significantly greater masses than previously estimated. In a departure from earlier methods, the new study uses mounted skeletons to generate body mass estimates. Wed, 12 Oct 2011 18:56:56 EDT http://www.sciencedaily.com/releases/2011/10/111012185634.htm http://www.sciencedaily.com/releases/2011/07/110712211016.htm A team of scientists has discovered the youngest dinosaur preserved in the fossil record before the catastrophic meteor impact 65 million years ago. The finding indicates that dinosaurs did not go extinct prior to the impact and provides further evidence as to whether the impact was in fact the cause of their extinction. Tue, 12 Jul 2011 21:10:10 EDT http://www.sciencedaily.com/releases/2011/07/110712211016.htm http://www.sciencedaily.com/releases/2011/06/110628132557.htm When dinosaurs were first discovered in the mid-19th century, paleontologists thought they were plodding beasts that relied on their environment to keep warm, like modern-day reptiles. Tue, 28 Jun 2011 13:25:25 EDT http://www.sciencedaily.com/releases/2011/06/110628132557.htm http://www.sciencedaily.com/releases/2011/06/110623141312.htm Were dinosaurs slow and lumbering, or quick and agile? It depends largely on whether they were cold or warm blooded. Now, a team of researchers has developed a new approach to take body temperatures of dinosaurs for the first time, providing new insights into whether dinosaurs were cold or warm blooded. Thu, 23 Jun 2011 14:13:13 EDT http://www.sciencedaily.com/releases/2011/06/110623141312.htm http://www.sciencedaily.com/releases/2011/06/110609174852.htm Some asteroids may have been like "molecular factories" cranking out life's ingredients and shipping them to Earth via meteorite impacts, according to scientists who've made discoveries of molecules essential for life in material from certain kinds of asteroids and comets. Now it appears that at least one may have been less like a rigid assembly line and more like a flexible diner that doesn't mind making changes to the menu. Thu, 09 Jun 2011 17:48:48 EDT http://www.sciencedaily.com/releases/2011/06/110609174852.htm http://www.sciencedaily.com/releases/2011/05/110509151236.htm While adult tyrannosaurs wielded power and size to kill large prey, youngsters used agility to hunt smaller game. Mon, 09 May 2011 15:12:12 EDT http://www.sciencedaily.com/releases/2011/05/110509151236.htm http://www.sciencedaily.com/releases/2011/04/110414141354.htm The movie Jurassic Park got one thing right: those velociraptors hunted by night while the big plant-eaters browsed around the clock, according to a new study of the eyes of fossil animals. Thu, 14 Apr 2011 14:13:13 EDT http://www.sciencedaily.com/releases/2011/04/110414141354.htm http://www.sciencedaily.com/releases/2011/04/110412201724.htm Birds are known more for their senses of vision and hearing than smell, but new research suggests that millions of years ago, the winged critters also boasted a better sense for scents. Tue, 12 Apr 2011 20:17:17 EDT http://www.sciencedaily.com/releases/2011/04/110412201724.htm http://www.sciencedaily.com/releases/2011/04/110412201715.htm Scientists have discovered a fossilized dinosaur skull and neck vertebrae that not only reveal a new species, but also an evolutionary link between two groups of dinosaurs. The new species, Daemonosaurus chauliodus, was discovered at Ghost Ranch, New Mexico. Tue, 12 Apr 2011 20:17:17 EDT http://www.sciencedaily.com/releases/2011/04/110412201715.htm http://www.sciencedaily.com/releases/2011/03/110331191528.htm Scientists have identified a new species of gigantic theropod dinosaur, a close relative of T. rex, from fossil skull and jaw bones discovered in China. Thu, 31 Mar 2011 19:15:15 EDT http://www.sciencedaily.com/releases/2011/03/110331191528.htm http://www.sciencedaily.com/releases/2011/02/110222140550.htm Was T. rex really the king of the forest? A new census of dinosaurs in Montana's Hell Creek Formation shows that T. rex was far too abundant to be a top predator. Paleontologists argue that T. rex probably subsisted on a broad variety of dead as well as live animals, much like today's hyena. Tue, 22 Feb 2011 14:05:05 EST http://www.sciencedaily.com/releases/2011/02/110222140550.htm http://www.sciencedaily.com/releases/2011/01/110127141707.htm Researchers have determined that a fossilized dinosaur bone found in New Mexico confounds the long established paradigm that the age of dinosaurs ended between 65.5 and 66 million years ago. Thu, 27 Jan 2011 14:17:17 EST http://www.sciencedaily.com/releases/2011/01/110127141707.htm http://www.sciencedaily.com/releases/2011/01/110126081714.htm Tyrannosaurus rex hunted like a lion, rather than regularly scavenging like a hyena, new research reveals. The findings end a long-running debate about the hunting behavior of this awesome predator. Wed, 26 Jan 2011 08:17:17 EST http://www.sciencedaily.com/releases/2011/01/110126081714.htm http://www.sciencedaily.com/releases/2011/01/110124151717.htm A new species of parrot-sized dinosaur, the first discovered with only one finger, has been unearthed in Inner Mongolia, China. Mon, 24 Jan 2011 15:17:17 EST http://www.sciencedaily.com/releases/2011/01/110124151717.htm http://www.sciencedaily.com/releases/2011/01/110113141611.htm A team of paleontologists and geologists from Argentina and the United States have discovered a lanky dinosaur that roamed South America in search of prey as the age of dinosaurs began, approximately 230 million years ago. Sporting a long neck and tail and weighing only 10 to 15 pounds, the new dinosaur has been named Eodromaeus -- the "dawn runner." Thu, 13 Jan 2011 14:16:16 EST http://www.sciencedaily.com/releases/2011/01/110113141611.htm http://www.sciencedaily.com/releases/2010/12/101222173039.htm New experiments have generated evidence that questions the common belief that the pterygotid eurypterids ("sea scorpions") were high-level predators in the Paleozoic oceans. Wed, 22 Dec 2010 17:30:30 EST http://www.sciencedaily.com/releases/2010/12/101222173039.htm http://www.sciencedaily.com/releases/2010/12/101220163052.htm Scientists used statistical analyses to determine the diet of 90 species of theropod dinosaurs. Their results challenge the conventional view that nearly all theropods hunted prey, especially those closest to the ancestors of birds. Mon, 20 Dec 2010 16:30:30 EST http://www.sciencedaily.com/releases/2010/12/101220163052.htm http://www.sciencedaily.com/releases/2010/11/101115131127.htm Tyrannosaurus rex was far from a plodding Cretaceous era scavenger whose long tail only served to counterbalance the up-front weight of its freakishly big head. T. rex's athleticism (and its rear end) has now been given a makeover. New research shows that powerful tail muscles made the giant carnivore one of the fastest moving hunters of its time. Mon, 15 Nov 2010 13:11:11 EST http://www.sciencedaily.com/releases/2010/11/101115131127.htm http://www.sciencedaily.com/releases/2010/10/101015185836.htm It turns out that the undisputed king of the dinosaurs, Tyrannosaurus rex, didn't just eat other dinosaurs but also each other. Paleontologists from the United States and Canada have found bite marks on the giants' bones that were made by other T. rex, according to a new study. Fri, 15 Oct 2010 18:58:58 EDT http://www.sciencedaily.com/releases/2010/10/101015185836.htm http://www.sciencedaily.com/releases/2010/10/101014160941.htm By examining the type of rock in which dinosaur fossils were embedded, an often unappreciated part of the remains, scientists have determined that different species of North American dinosaurs from the Late Cretaceous period 65 million years ago occupied different environments separated by just a few miles. Thu, 14 Oct 2010 16:09:09 EDT http://www.sciencedaily.com/releases/2010/10/101014160941.htm http://www.sciencedaily.com/releases/2010/09/100930171418.htm It might seem obvious that a dinosaur's leg bone connects to the hip bone, but what came between the bones has been less obvious. Now, researchers have found that dinosaurs had thick layers of cartilage in their joints, which means they may have been considerably taller than previously thought. Thu, 30 Sep 2010 17:14:14 EDT http://www.sciencedaily.com/releases/2010/09/100930171418.htm http://www.sciencedaily.com/releases/2010/09/100922121943.htm Discovery of two new horned dinosaurs in southern Utah are part of an entirely new assemblage of dinosaurs found in the Grand Staircase-Escalante Monument, and which confirm that dinosaurs living in the area called Laramidia were divided into at least northern and southern provinces. Wed, 22 Sep 2010 12:19:19 EDT http://www.sciencedaily.com/releases/2010/09/100922121943.htm http://www.sciencedaily.com/releases/2010/09/100916145131.htm A new research paper highlights recent tyrannosaur discoveries and complex analyses of the biology of certain species. The paper includes a new family tree for T. rex and its relatives. Thu, 16 Sep 2010 14:51:51 EDT http://www.sciencedaily.com/releases/2010/09/100916145131.htm http://www.sciencedaily.com/releases/2010/08/100831190028.htm Palaeontologists are forever claiming that their latest fossil discovery will "rewrite evolutionary history." Is this just boasting or does our "knowledge" of evolution radically change every time we find a new fossil? Tue, 31 Aug 2010 19:00:00 EDT http://www.sciencedaily.com/releases/2010/08/100831190028.htm http://www.sciencedaily.com/releases/2010/08/100830152523.htm Paleontologists have discovered that a close relative of Velociraptor hunted the dwarfed inhabitants of Late Cretaceous Europe, an island landscape largely isolated from nearby continents. While island animals tend to be smaller and more primitive than their continental cousins, the theropod Balaur bondoc was as large as its relatives on other parts of the globe and demonstrated advanced adaptations including fused bones and two terrifyingly large claws on each hind foot. Mon, 30 Aug 2010 15:25:25 EDT http://www.sciencedaily.com/releases/2010/08/100830152523.htm http://www.sciencedaily.com/releases/2010/08/100823131743.htm Archaeologists have found a Utah site occupied by humans 11,000 years ago. The researchers documented a variety of dishes the people dined on back then. Grind stones for milling small seeds appeared 10,000 years ago. Mon, 23 Aug 2010 13:17:17 EDT http://www.sciencedaily.com/releases/2010/08/100823131743.htm http://www.sciencedaily.com/releases/2010/05/100528124513.htm A new species of horned dinosaur unearthed in Mexico has larger horns that any other species -- up to 4 feet long -- and has given scientists fresh insights into the ancient history of western North America, according to paleontologists. Fri, 28 May 2010 12:45:45 EDT http://www.sciencedaily.com/releases/2010/05/100528124513.htm http://www.sciencedaily.com/releases/2010/05/100528113914.htm A new horned dinosaur, Medusaceratops lokii, has been discovered. Approximately 20 feet long and weighing more than 2 tons, the newly identified plant-eating dinosaur lived nearly 78 million years ago during the Late Cretaceous period in what is now Montana. Its identification marks the discovery of a new genus of horned dinosaur. Fri, 28 May 2010 11:39:39 EDT http://www.sciencedaily.com/releases/2010/05/100528113914.htm http://www.sciencedaily.com/releases/2010/05/100524151428.htm Questions about when, why, and how vertebrates stopped relying on external factors to regulate their body temperatures and began heating themselves internally have long intrigued scientists. Now, a team of researchers has taken a critical step toward providing some answers. They have developed the first method for the direct measurement of the body temperatures of large extinct vertebrates -- through the analysis of rare isotopes in the animals' bones, teeth, and eggshells. Mon, 24 May 2010 15:14:14 EDT http://www.sciencedaily.com/releases/2010/05/100524151428.htm http://www.sciencedaily.com/releases/2010/03/100325143045.htm Scientists have found the first ever evidence that tyrannosaur dinosaurs existed in the southern continents. They identified a hip bone found at Dinosaur Cove in Victoria, Australia, as belonging to an ancestor of Tyrannosaurus rex. Thu, 25 Mar 2010 14:30:30 EDT http://www.sciencedaily.com/releases/2010/03/100325143045.htm http://www.sciencedaily.com/releases/2010/03/100322153947.htm How did dinosaurs become rulers of Earth more than 200 million years ago? Widespread volcanism and a spike in atmospheric carbon dioxide wiped out half of all plant species, and extinguished early crocodile relatives that had competed with the earliest dinosaurs, according to experts. Mon, 22 Mar 2010 15:39:39 EDT http://www.sciencedaily.com/releases/2010/03/100322153947.htm http://www.sciencedaily.com/releases/2010/03/100322113832.htm Ancient bite marks and fossilized feces discovered in Georgia are providing new details about a giant crocodile that roamed the Southeast United States about 79 million years ago. Mon, 22 Mar 2010 11:38:38 EDT http://www.sciencedaily.com/releases/2010/03/100322113832.htm http://www.sciencedaily.com/releases/2010/03/100319085257.htm A new species of dinosaur, a relative of the famous Velociraptor, has been discovered in Inner Mongolia by two Ph.D. students. The exceptionally well preserved dinosaur, named Linheraptor exquisitus, is the first near complete skeleton of its kind to be found in the Gobi desert since 1972, and will help scientists work out the appearance of other closely related dinosaur species. Fri, 19 Mar 2010 08:52:52 EDT http://www.sciencedaily.com/releases/2010/03/100319085257.htm http://www.sciencedaily.com/releases/2010/02/100209183335.htm A new study provides yet more evidence that birds did not descend from ground-dwelling theropod dinosaurs, experts say, and continues to challenge decades of accepted theories about the evolution of flight. Tue, 09 Feb 2010 18:33:33 EST http://www.sciencedaily.com/releases/2010/02/100209183335.htm http://www.sciencedaily.com/releases/2010/01/100131220341.htm A new species of tyrannosaur has been discovered in the Bisti/De-na-zin Wilderness of New Mexico. Bistahieversor was different from other tyrannosauroids in having an extra opening above its eye, a complex joint at its "forehead," and a keel along its lower jaw; it also had more teeth than its distant relative T. rex. Sun, 31 Jan 2010 22:03:03 EST http://www.sciencedaily.com/releases/2010/01/100131220341.htm http://www.sciencedaily.com/releases/2010/01/100128142135.htm An expedition to the Gobi Desert has enabled researchers to solve the puzzle of how one group of dinosaurs came to look like birds independent of birds. Until now, there was no direct evidence that dinosaurs of the Alvarezsauridae family lived during the Late Jurassic, approximately 160 million years ago. The newly discovered species of dinosaur was named Haplocheirus sollers (meaning simple, skillful hand). Thu, 28 Jan 2010 14:21:21 EST http://www.sciencedaily.com/releases/2010/01/100128142135.htm http://www.sciencedaily.com/releases/2010/01/100105195246.htm Animals produce a tremendous diversity of sounds for communication to perform life's basic functions, from courtship and parental care to defense and foraging. Explaining this diversity in sound production is important for understanding the ecology, evolution and behavior of species. Scientists have presented a theory of acoustic communication that shows that much of the diversity in animal vocal signals can be explained based on the energetic constraints of sound production. Tue, 05 Jan 2010 19:52:52 EST http://www.sciencedaily.com/releases/2010/01/100105195246.htm http://www.sciencedaily.com/releases/2009/12/091222122021.htm Now that an early carnivore fossil has been fully removed from its matrix (this after spending over a century on a shelf because of the associated crushed teeth), scientists are able to re-interpret the evolutionary tree of this group of mammals. Tue, 22 Dec 2009 12:20:20 EST http://www.sciencedaily.com/releases/2009/12/091222122021.htm http://www.sciencedaily.com/releases/2009/12/091210153532.htm Discovery of a new species of 213-million-year-old meat-eating dinosaur in New Mexico suggests the first dinosaurs wandered between parts of the Pangea supercontinent that later became North and South America, according to a team of researchers. Thu, 10 Dec 2009 15:35:35 EST http://www.sciencedaily.com/releases/2009/12/091210153532.htm http://www.sciencedaily.com/releases/2009/11/091104122538.htm A long forgotten fossil skull in the collections of the Natural History Museum in London has now provided crucial clues to the early stages of the lengthy evolutionary history of Tyrannosaurus rex and related large carnivorous dinosaurs. Wed, 04 Nov 2009 12:25:25 EST http://www.sciencedaily.com/releases/2009/11/091104122538.htm http://www.sciencedaily.com/releases/2009/11/091102121454.htm Teenage tyrannosaurs got into some serious fights with their peers. The evidence can be found on Jane, a prized juvenile Tyrannosaurus rex, discovered in 2001 in Montana. The dinosaur's fossils show that it sustained a serious bite that punctured through the bone of its upper jaw and snout. The researchers determined that another juvenile tyrannosaur was responsible for the injury. Mon, 02 Nov 2009 12:14:14 EST http://www.sciencedaily.com/releases/2009/11/091102121454.htm http://www.sciencedaily.com/releases/2009/10/091031002314.htm Paleontologists Mark Goodwin and Jack Horner have dug for 11 years in Montana's Hell Creek Formation in search of every dinosaur fossil they can find, accumulating specimens of all stages of development. Their new report on the growth stages of dome-headed dinosaurs shows that two named species are really just young pachycephalosaurs. They say that perhaps one-third of all named dinosaurs may not be separate species, but juvenile or subadult stages of other known dinosaurs. Sat, 31 Oct 2009 00:23:23 EDT http://www.sciencedaily.com/releases/2009/10/091031002314.htm http://www.sciencedaily.com/releases/2009/10/091006155909.htm A Canadian researcher has found 70 million year old evidence of dinosaur cannibalism. The jawbone of what appears to be a Gorgosaurus was found in 1996 in southern Alberta. A technician at the Royal Tyrell Museum in Alberta found something unusual embedded in the jaw. It was the tip of a tooth from another meat-eating dinosaur. Tue, 06 Oct 2009 15:59:59 EDT http://www.sciencedaily.com/releases/2009/10/091006155909.htm http://www.sciencedaily.com/releases/2009/10/091005124831.htm Just a few weeks after tiny, early Raptorex kriegsteini was unveiled, a new wrench has been thrown into the family tree of the tyrannosaurs. The new Alioramus altai -- a horned, long-snouted, gracile cousin of Tyrannosaurus rex -- shared the same environment with larger, predatory relatives. Mon, 05 Oct 2009 12:48:48 EDT http://www.sciencedaily.com/releases/2009/10/091005124831.htm http://www.sciencedaily.com/releases/2009/09/090929133117.htm When pondering the demise of a famous dinosaur such as 'Sue,' the mighty Tyrannosaurus rex whose fossilized remains are a star attraction of the Field Museum in Chicago, it is hard to avoid the image of clashing Cretaceous titans engaged in bloody, mortal combat. But a new study provides evidence that Sue, perhaps the most famous dinosaur in the world, was felled in more mundane fashion by a lowly parasite that still afflicts modern birds. Tue, 29 Sep 2009 13:31:31 EDT http://www.sciencedaily.com/releases/2009/09/090929133117.htm http://www.sciencedaily.com/releases/2009/09/090928205415.htm A fossil of a bird-like dinosaur with four wings has been discovered in northeastern China. The specimen bridges a critical gap in the transition from dinosaurs to birds, and reveals new insights into the origin evolution of feathers. Mon, 28 Sep 2009 20:54:54 EDT http://www.sciencedaily.com/releases/2009/09/090928205415.htm http://www.sciencedaily.com/releases/2009/09/090917144115.htm When you think of Tyrannosaurus rex, a small set of striking physical traits comes to mind: an oversized skull with powerful jaws, tiny forearms and the muscular hind legs of a runner. But, researchers have just unearthed a much smaller tyrannosauroid in China, no more than three meters long, that displays all the same features -- and it predates the T. rex by tens of millions of years. Thu, 17 Sep 2009 14:41:41 EDT http://www.sciencedaily.com/releases/2009/09/090917144115.htm http://www.sciencedaily.com/releases/2009/08/090806112357.htm Tyrannosaurus rex and other predatory dinosaurs might not have been fearless hunters after all. Using new fossil evidence, researchers in Germany propose that the large carnivores hunted mainly juvenile dinosaurs instead of giant herbivorous adults. Thu, 06 Aug 2009 11:23:23 EDT http://www.sciencedaily.com/releases/2009/08/090806112357.htm http://www.sciencedaily.com/releases/2009/07/090729103737.htm A new analysis of the remains of a Tyrannosaurus rex (T. rex) that roamed Earth 68 million years ago has confirmed traces of protein from blood and bone, tendons, or cartilage. The findings is the latest addition to an ongoing controversy over which biochemical remnants can be detected in the dinosaur. Wed, 29 Jul 2009 10:37:37 EDT http://www.sciencedaily.com/releases/2009/07/090729103737.htm http://www.sciencedaily.com/releases/2009/07/090703070846.htm Scientists have discovered three new species of Australian dinosaur discovered in a prehistoric billabong in Western Queensland: two giant, herbivorous sauropods and one carnivorous theropod. Fri, 03 Jul 2009 07:08:08 EDT http://www.sciencedaily.com/releases/2009/07/090703070846.htm http://www.sciencedaily.com/releases/2009/06/090617171816.htm Scientists have discovered a unique beaked, plant-eating dinosaur in China. The finding, they say, demonstrates that theropod, or bird-footed, dinosaurs were more ecologically diverse in the Jurassic period than previously thought, and offers important evidence about how the three-fingered hand of birds evolved from the hand of dinosaurs. Wed, 17 Jun 2009 17:18:18 EDT http://www.sciencedaily.com/releases/2009/06/090617171816.htm http://www.sciencedaily.com/releases/2009/06/090609092055.htm Researchers have made a fundamental new discovery about how birds breathe and have a lung capacity that allows for flight -- and the finding means it's unlikely that birds descended from any known theropod dinosaurs. Tue, 09 Jun 2009 09:20:20 EDT http://www.sciencedaily.com/releases/2009/06/090609092055.htm http://www.sciencedaily.com/releases/2009/04/090430144528.htm Ancient protein dating back 80 million years to the Cretaceous geologic period has been preserved in bone fragments and soft tissues of a hadrosaur, or duck-billed dinosaur. The new findings support earlier results suggesting that collagen protein survived in the bones of a well preserved Tyrannosaurus rex, and offer robust new evidence supporting previous conclusions that birds and dinosaurs are evolutionarily related. Thu, 30 Apr 2009 14:45:45 EDT http://www.sciencedaily.com/releases/2009/04/090430144528.htm http://www.sciencedaily.com/releases/2009/04/090422085144.htm A team of researchers from China and the US have excavated a treasure trove of dinosaur skeletons from Early Cretaceous rocks in the southern part of the Gobi Desert. Two of their discoveries represent new species of theropod dinosaurs, including one that represents a 'missing link' in the fossil record of tyrannosaurs. Wed, 22 Apr 2009 08:51:51 EDT http://www.sciencedaily.com/releases/2009/04/090422085144.htm http://www.sciencedaily.com/releases/2009/03/090316173218.htm Massive predators like Albertosaurus and Tyrannosaurus Rex may have been at the top of the food chain, but they were not the only meat-eating dinosaurs to roam North America, according to Canadian researchers who have discovered the smallest dinosaur species on the continent to date. Their work is also helping re-draw the picture of North America's ecosystem at the height of the dinosaur age 75 million years ago. Mon, 16 Mar 2009 17:32:32 EDT http://www.sciencedaily.com/releases/2009/03/090316173218.htm http://www.sciencedaily.com/releases/2009/02/090220110912.htm Scientists used laser imaging to investigate how fat -- or fit -- T. rex and his fellow dinosaurs were. Researchers found that a small T. rex could have weighed anywhere between 5.5 and 7 tonnes, while their larger specimen (Stan) might have weighed as much as 8 tonnes. Fri, 20 Feb 2009 11:09:09 EST http://www.sciencedaily.com/releases/2009/02/090220110912.htm http://www.sciencedaily.com/releases/2009/02/090204112217.htm The largest snake the world has ever known -- as long as a school bus and as heavy as a small car -- ruled tropical ecosystems only 6 million years after the demise of the fearsome Tyrannosaurus rex, according to a new discovery published in the journal Nature. Wed, 04 Feb 2009 11:22:22 EST http://www.sciencedaily.com/releases/2009/02/090204112217.htm http://www.sciencedaily.com/releases/2009/01/090126082351.htm A recent study by researchers in England has found that scientists' knowledge of the evolution of dinosaurs is remarkably complete. Mon, 26 Jan 2009 08:23:23 EST http://www.sciencedaily.com/releases/2009/01/090126082351.htm