Tyrannosaurus Rex Essay

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Tyrannosaurus Rex

The name says it all. This group of huge carnivores ruled the land during the Cretaceous period. Short but deep jaws, long hind limbs (legs), beady eyes, a long muscular tail, and tiny forelimbs (arms) make up a tyrannosaur. The Tyrannosauridae included such similar animals as Albertosaurus, Gorgosaurus, Daspletosaurus, Tarbosaurus, and of course Tyrannosaurus Rex. A tremendous skeleton of Rex now stands guard in the Valley Life Sciences Building in Washington. Tyrannosaurs belong to the Saurischia, or "reptile-hipped" dinosaurs. Within the Saurischia, tyrannosaurs belong to the group of carnivorous dinosaurs known as theropods. Traditionally, the tyrannosaurs have been included within the Carnosauria. In this
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Tyrannosaurs are surprisingly common in many North American fossil beds, especially their large, serrated teeth, which they shed periodically like most archosaurs. The teeth of tyrannosaurs are very interesting. Rather than being the flat knifelike blades as in most other carnivorous dinosaurs, they are more like giant spikes than razor-edged blades. With a mouthful of these murderous weapons, tyrannosaurs had a whopping bite, which might have made up for their reduced forelimbs. The bite marks of these teeth are quite recognizable on some dinosaur bones. Some tyrannosaur fossils show evidence of bite marks from other tyrannosaurs, suggesting that there might have been fierce fighting between tyrannosaurs, and even cannibalism. The rarest tyrannosaur fossils are those of T. Rex, making studying that animal particularly difficult. Most known dinosaurs are represented by only one good specimen, if that much. So T. Rex is not nearly the rarest fossil find of all.

Tyrannosaurus, being the most ferocious of the dinosaurs, weighed over seven-tons. Tyrannosaurus actually means "king of the tyrant lizards." Tyrannosaurus was probably the largest land predator ever. It stood almost 20 feet tall on it's rear legs. It had a massive tail, puny front legs, powerful jaws, and sharp seven-inch-long saw-edged teeth for tearing its prey. From nose to tail Tyrannosaurus measured up to 45 feet in length. It's skull alone was nearly four feet long.

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