Dinosaurs
Tyrannosaurus
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Tyrannosaurus rex, or T. rex for short, was a dinosaur that lived on Earth about 65 to
70 million years ago, during the Cretaceous period. T. rex is one of the largest
carnivorous (meat-eating) dinosaurs ever discovered.

What was their body shape?
Tyrannosaurus rex was up to 13 meters (42 feet) long, 5 meters (16 feet) tall, and
weighed 4 to 6 tons (8,820 lb to 13,220 lbs.)- longer then a bus, and heavier then an
elephant. It had a forward tilt, deep jaws, huge teeth, long tail, and tiny arms (also
known as forelimbs). T. red’s jaw alone was about 1.3 meters long and had fifty to
sixty bone-crunching teeth that were up to 10 centimetres long. Its arms were very
stubby, no longer then a human being's. They were very strong, able to lift up to
two hundred kilograms, but were not long enough to touch each other! T. rex stood
on two powerful hind legs, each ending with a three toed foot, resembling a bird's
foot, only much larger.

What did they eat?
T. rex was a very big meat-eating dinosaur. It would have been at the top of the
food chain. It is known to have fed on other large dinosaurs, such as
Edmontosaurus, Anatotitan, and Triceratops, and probably could have swallowed
smaller dinosaurs in a single bite.
One scientist believes that T. rex was a scavenger (an animal that eats already
dead animals). He argues that it might not have been fast enough to catch prey.
Other scientists believe that T. rex probably scavenged and hunted, like most
living meat-eaters (such as tigers and lions). T. rex bite marks found on the bones of
Edmontosaurus and Triceratops that have healed show that Tyrannosaurus did hunt
at least some of the time - and also that its prey was sometimes lucky enough to
escape.

One thing that T. rex did not eat was people. People didn't appear on earth until
over 60 million years later, much too late for anyone to ever be afraid of being
hunted down by a T. rex.

When did they live?
Tyrannosaurus lived about 70 to 65 million years ago in the late Cretaceous Period.
T. rex was among the last of the big dinosaurs. Like all dinosaurs, T. rex lived in the
Mesozoic era.

What was their habitat?
Tyrannosaurus is believed to have lived in forests, near rivers, and in areas that
were open. Mild seasons also would have been most favourable to Tyrannosaurus
fossils have been found in western North America and possibly Asia.

How were they discovered?
The famous fossil hunter Barnum Brown found the first Tyrannosaurus fossil in 1905 .
Tyrannosaurus was not the dinosaur's name until 1905, when it was given that name
by Henry Fairfield Osborn. About 3,000 Tyrannosaurus fossils have been found, from
pieces of teeth to nearly complete skeletons. Only one possible Tyrannosaurus
footprint has been found.

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