Buffy Silverman - Can You Tell a Tyrannosaurus from an Allosaurus?

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12

Can You Tell a

Tyrannosaurus

from an

Allosaurus?

Buffy Silverman

To JKC,

King of my heart

Love, BGS

Copyright 2014 by Lerner Publishing Group, Inc.

All rights reserved. International copyright secured. No part of this book may be reproduced,
stored in a retrieval system, or transmitted in any form or by any meanselectronic, mechanical,
photocopying, recording, or otherwisewithout the prior written permission of Lerner Publishing
Group, Inc., except for the inclusion of brief quotations in an acknowledged review.

Lerner Publications Company
A division of Lerner Publishing Group, Inc.
241 First Avenue North
Minneapolis, MN 55401 U.S.A.

Website address: www.lernerbooks.com

Library of Congress Cataloging-in-Publication Data

Silverman, Buffy.

Can you tell a tyrannosaurus from an allosaurus? / by Buffy Silverman.
pages cm. (Lightning bolt booksTMDinosaur look-alikes)
Includes index.
ISBN 9781467713559 (library binding : alkaline paper)
ISBN 9781467717595 (eBook)
1. TyrannosaurusJuvenile literature. 2. AllosaurusJuvenile literature. 3. Dinosaurs
Juvenile literature. I. Title.
QE862.S3S4836 2014
567.912dc23

2013003024

Manufactured in the United States of America
1 BP 7/15/13

Table of Contents

Two Fingers
or Three?

Millions of years ago, huge
dinosaurs walked on two legs.
Their arms looked tiny on
their giant bodies.

TyrannosaurusandAllosaurusweretwoofthesegiants.

Tyrannosaurus and
Allosaurus were both
meat eaters.

Their sharp
teeth and claws gripped and
tore food. They belonged to
a group called theropods.

Theropods stood
on two legs. The
birds in your yard
are related to
them!

They held their heads low
to the ground. Strong, short
necks supported their huge
heads. Long tails balanced the
weight of their heads. But you
can tell these dinosaurs apart.

Two children balance on a seesaw if
they are the same weight. A heavy
tail balances a heavy head in the
same way.

Count the fingers on a
Tyrannosaurus hand.
Each hand had two fingers
with hook- shaped claws.

A Tyrannosaurus
claw was about the
length of your hand.

Look at an Allosaurus skeleton.
Allosaurus had three fingers.
Its hands and claws were
larger than Tyrannosaurus
hands and claws.

Each finger ended in
a hooked claw. Sharp,
strong claws helped
Allosaurus hunt.

Finding
Food

Some scientists think
Tyrannosaurus was a scavenger.
Scavengers find and
eat dead animals.
These scientists
dont think
Tyrannosaurus
could have held
live prey with only
two fingers.

Animals that are hunted
for food are called prey.

Other scientists think
Tyrannosaurus hunted. They
studied animal fossils with bite
marks from Tyrannosaurus.
Some of the bite marks had
healed. That means an animal
escaped from
the hunter!

You can see bite marks
from Tyrannosaurus
teeth on these fossils.

Allosaurushuntedliveprey.

Scientists dont know if these
dinos hunted alone or in
packs. They might have
battled one another for food.

Allosaurus hunted small
dinosaurs. It probably hunted
other larger animals too.

Allosaurus might have hunted and
fought with Stegosaurus.

Teeth: Long
or Short?

Tyrannosaurus teeth were as
big as bananas. They were
shaped like ice- cream cones.
They tore through flesh.

Allosaurus teeth were flatter
and shorter. They were about
the size of your fingers.

Their
sharp edges cut like knives.

Allosaurus could open its
jaws very wide. Its top teeth
worked like a hatchet.

They
sliced off chunks of flesh.

Tyrannosaurus bit much
harder than Allosaurus.
It had superstrong jaws.
Its teeth sunk deep into
flesh and crushed bones.

Body Size:
Big or Bigger?

Imagine standing on the
ground and
peeking into
a second-
story window.
Allosaurus
was tall
enough to do
that! It grew
as long as
a school bus.

Tyrannosaurus was even
bigger.

Its head could almost
reach the roof of a two- story
house. Its body stretched
longer than Allosaurus.

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