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THEY ARE GOOD HUNTERS
keagan

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t rex lives in forests, rivers and places where there’s lots of prey

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keagan

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chases its prey

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T-Rex lived in the forest

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they died a million years ago

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t rex has a massive body a mouth full of 60 inch long

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it is cute

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although a baby t-rex would be a size of a small turkey adults grew way beyond these feathered creaturs sue's skull weighs 600 pounds

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trex has super sharp teeth and the strongest bite of any land animal

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the t rex’s name comes from the greek words meaning tyrant lizard king

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A 40-foot-long predator stomps through a forested valley in what’s now western North America, following its nose: The animal sniffs a tasty Triceratops nearby. Moving quickly—about 12 miles an hour—the carnivore catches up to its prey. With one powerful bite, it rips off a hundred pounds of meat. Then it throws its head back, tosses the flesh 15 feet into the air, and catches it to swallow it whole.

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If cars had been around in Tyrannosaurus rex's day, its bite could have dented the metal

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Scientists have known about T. Rex for more than a hundred years, but it wasn’t until the 1980s that the most complete fossil was discovered in South Dakota. Named Sue after the fossil hunter who found it, the 13-foot-tall dino measures 42 feet from end to end.

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Although a baby T. rex would be about the size of a small turkey, adults grew way beyond these feathered creatures. Sue’s skull weighs 600 pounds; when it was alive, the dino probably weighed about 18,000 pounds—about as much as an RV. Want to see for yourself? You can visit Sue at the Field Museum of Natural History in Chicago, Illinois.

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Other species of tyrannosaurs existed for a hundred million years before T. rex appeared, but these dinos were puny compared to other giant predators at the time, like allosaurs, ceratosaurs, and spinosaurs.

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Other species of tyrannosaurs existed for a hundred million years before T. rex appeared, but these dinos were puny compared to other giant predators at the time, like allosaurs, ceratosaurs, and spinosaurs. (The smallest tyrannosaur, Dilong, was only about five feet long and weighed about 11 pounds.) But Tyrannosaurus rex was one of the fiercest predators of all time.

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The new research got its start as discussions between co-authors Thomas Cullen, Kirstin Brink, and Derek Larson while all three were graduate students at the University of Toronto. Each had developed different expertise on dinosaurs and their anatomy, which began to meld together into tangible evidence for how dinosaurs like T. rex would have looked. (Read how billions of T. rex likely roamed Earth.)

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T. rex has a brain about twice as large as other dinosaur noodles, suggesting that it might have been more intelligent, with better vision and sense of smell, than its fellow dinosaurs.

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Its name comes from the Greek words meaning “tyrant lizard king.” This “king” ruled over what’s now North America and Asia some 68 million years ago, during the Cretaceous period. But T. rex was no match for the giant asteroid that slammed into Earth 66 million years ago, causing the extinction of the dinosaurs.

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Scientists have known about T. Rex for more than a hundred years, but it wasn’t until the 1980s that the most complete fossil was discovered in South Dakota. Named Sue after the fossil hunter who found it, the 13-foot-tall dino measures 42 feet from end to end.

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To determine whether dinosaurs like T. rex had exceptionally long teeth, Cullen, now at Auburn University; Brink; and colleagues examined the anatomy of living lizards and crocodiles, the microscopic structure of dinosaur teeth, and how tooth size compares with skull dimensions in species from T. rex to smaller carnivores such as Velociraptor and Coelophysis.

The star specimen, however, was the T. rex nicknamed Sue, the largest and most complete representative of the storied species (and on display at Chicago’s Field Museum). Despite Sue seeming to have extra-long chompers, the paleontologists found its teeth had the same relationship to skull size as seen in today’s monitor lizards, and therefore wouldn’t require any extraordinary lips to cover.

A critical part of the research was finding modern analogs. Today’s birds—descendants of dinosaurs—lack teeth, and crocodiles are specialized reptiles that live in water. Even though they’re not as closely related, however, reptiles such as monitor lizards are more useful in their relatedness to dinosaur anatomy. (Learn why T. rex couldn’t waggle its tongue.)

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Adding lips to T. rex and other dinosaurs creatures a fuller image of their anatomy and how they interacted with their environments, the scientists say.

“I’m very interested in the role soft tissues play when interpreting tooth pathologies,” Brink says, as gums, lips, and other tissues could experience many of the same injuries and diseases that affect living animals.

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More than 66 million years ago, a “tyrant lizard king” ruled western North America: the fearsome predatory dinosaur Tyrannosaurus rex. But how large was this monarch’s royal family? Could what we call T. rex today be composed of multiple species?

In a controversial new study in the journal Evolutionary Biology, three paleontologists argue that the fossils assigned to T. rex cluster into three different body types, which they further contend represent three separate species. In addition to T. rex, the researchers propose two new species names: T. regina and T. imperator, from the Latin for “queen” and “emperor.”

“For Tyrannosaurus, all the specimens from North America have been put into the same species, T. rex … and that’s become something of a problem because nobody was testing whether that was really true or not,” says study leader Gregory Paul, a paleoartist and independent researcher who wrote The Princeton Field Guide to Dinosaurs.

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Paleontologists have batted around the notion of multiple Tyrannosaurusspecies for decades. The predator lived for more than a million years across a swath of ancient North America from western Canada to New Mexico. That’s a large area, and a long time—possibly enough for populations to drift apart and form multiple species. (Find out why paleontologists think billions of T. rexmay have roamed the Earth.)

If anatomical traits in a given creature’s fossils clearly change over time, the creature may warrant multiple species names to distinguish earlier forms from later ones. In the last few decades, paleontologists have gained a better understanding of the way that such “chronospecies” may succeed one another.

Perhaps the most famous and well-established chronospecies come from western North America’s Hell Creek Formation, where Tyrannosaurus is found. Older sediments from the formation preserve one species of Triceratops, T. horridus, while younger rocks farther up the formation preserve a different species, T. prorsus. Some researchers have suggested a similar evolution for other Hell Creek dinosaurs.