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Dinosaurs by Mason

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Bill Burns

on 3 January 2014

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Transcript of Dinosaurs by Mason

There were 3 periods of dinosaurs
What are dinosaurs?
Dinosaur means "terrible lizard" in Greek.
Dinosaurs by Mason
Dinosaurs are reptiles like...
a Turtle
a Lizard
a Crocodile
an Iguana
Or a snake!
When did the dinosaurs live?
They lived about 250 million to 65 million
years ago in the Mesozoic era.
Triassic Period
250 to 206 million years ago

This is when the first dinosaurs
appeared. The earth was mostly
dry and hot.
There was only one land mass. All the continents we know today were together.
This is one of the earliest known
dinosaurs, Herrerasaurus.
Jurassic Period
was the second period of dinosaurs,
from 206 to 144 million years ago
The land started to break apart forming the continents.
The earth became more mild. There were more rain forests and less deserts.
Dinosaurs of the Jurassic period included sauropods which were herbivores and some of the largest dinosaurs ever!
There were also carnivores like the Allosaurus that ate other dinosaurs!
Cretaceous Period
was the third and last period of dinosaurs, from 144 to 65 million years ago
The earth began to cool. There were more plants.
I like the cretaceous period because there were Deinonychus dinosaurs. This is the dinosaur I want to show you. Deinonychus means "terrible claw."
The Deinonychus was a raptor around 10 feet long and weighed 150 pounds. It was about the size of a small deer.
They were carnivores, and sometimes they stole eggs. I like them because they could run really fast. They hunted in packs.
When it was ready to kill, it pounced on its prey's back and used its claw to kill. Others grabbed the prey's legs and they surrounded it.
Deinonychus were cool, but I am glad they are no longer around today to eat us.
by Mason Burns
Broomfield Academy
1st Grade - Mrs. Parrill
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