Written by Victoria St John
Dinosaurs – Big Brains,
Little Brains
24
Identifying Detail
Main Idea
Sequencing
Compare and Contrast
Fact and Opinion
Cause and Effect
The Prince and the Lion
Storm Chaser
The Long Life of Plastic
Dinosaurs – Big Brains, Little Brains
Hot Potatoes
The Rooftop Gardener
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Written by Victoria St John
Dinosaurs – Big Brains,
Little Brains
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . 2
Dinosaurs from Long Ago . . . . . . . . . . . . 6
Brain Size . . . . . . . . . . . . . . . . . . . . . . . . 8
Body Size . . . . . . . . . . . . . . . . . . . . . . . . 10
Movement . . . . . . . . . . . . . . . . . . . . . . . 12
Protection . . . . . . . . . . . . . . . . . . . . . . . .14
Slow Stegosaurus, Smart Troodon . . . . . 18
Smart Dinosaurs . . . . . . . . . . . . . . . . . . 22
Glossary . . . . . . . . . . . . . . . . . . . . . . . . 23
Index . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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2 3
Introduction
People often think dinosaurs were all big and
scary. They think dinosaurs all had small
brains. However, dinosaurs were not all the
same. Some were big. Some were small. Some
ate meat and some ate plants. They did not
have the same kinds of bodies. They did not
move in the same way.
Over millions of years, dinosaurs changed.
This process is called evolution. Dinosaurs
were reptiles. Many scientists think that some
may have changed into birds.
There were many kinds of dinosaurs of many different shapes and sizes.
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4 5
Scientists found dinosaur remains preserved in
rock, or fossils. They studied these fossils. They
learned there were many kinds of dinosaurs.
Some were smarter than others. Two kinds
scientists have found are Stegosaurus and
Troodon. They think Troodon was smarter than
Stegosaurus.Troodon means wounding tooth.
Stegosaurus means roofed lizard.
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200 million years ago
175
150
125
75
50
25
Present day
100
Stegosaurus lived during the Jurassic Period
Troodon lived during the Cretaceous Period
6 7
Dinosaurs from Long Ago All the dinosaurs lived a long time ago. But
some kinds lived longer ago than others.
Troodon lived a long time ago. It lived in a
time that lasted from 145 to 65 million years
ago. This is called the Cretaceous Period.
Stegosaurus, on the other hand, lived even
longer ago. It lived in a time that lasted from
200 to 145 million years ago. This is called the
Jurassic Period.
Time Line
Key
Jurassic Period 200 to 145 million years ago
Cretaceous Period 145 to 65 million years ago
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