Dinosaurs!: A Supplement to Childcraft - The How and Why Library 0716606682, 9780716606680

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y

Dinosaurs!

_

Dinosaurs! A supplement

to

Childcraft-The

World Book,

How and Why

Inc.

a Scott Fetzer company

Chicago London Sydney Toronto

Library

Copyright c 1987

World Book. Inc

Merchandise Mart All

Plaza. Chicago. Illinois

60654

rights reserved

Printed

m

the United States of America

ISBN 0-7166-0687-9 Library of Congress Catalog Card

No 65-25105

J

—

Contents 7 9

Preface Learning About Dinosaurs dinosaurs were discovered

—what a dinosaur was —a dinosaur dictionary—how we learned about dinosaurs from their bones, teeth, footprints, eggs, and the earth —seeing how big or how small a How

itself

dinosaur was.

55

Dinosaurs of the Triassic Period What the world was like between 245 million and 208 million years ago when dinosaurs began to appear the

ways of

Period

95

life

of typical dinosaurs of the Triassic

—other animals of the Triassic Period.

Dinosaurs of the Jurassic Period What the world was like between 208 million and 144 million years ago when dinosaurs were spreading out

—the ways of of typical dinosaurs of the Jurassic Period —other animals of the Jurassic Period. life

1

59

Dinosaurs of the Cretaceous Period What the world was like between 144 million and 65 million years

ago during the heyday of the dinosaurs

—the ways of of typical dinosaurs of the Cretaceous Period —other animals of the Cretaceous Period — what happened to the dinosaurs? — a time life

line

for the dinosaurs and

Read

294

Books

296

New Words

298

Acknowledgments

299

Index

to

some other animals.

Advisory Board

Editorial

Product Production

Staff

Executive Director

for Childcraft

The How and Why Library

H

Nault.

Ed D

Pre-Press Services J J Stack.

Chairman, William H Naull. A B

.

MA. Ed D

Editorial

Lilian

G

Katz.

BA, Ph D

Director,

Lori Frankel.

BA

Illinois,

Urbana-Champaign

Dominic J Miccolis.

Managing Editor Harry R Snowden,

Joseph

MA

Keith Osborn.

.

MA

.

Jr

,

M

S

Kay E Vandergnfl. B S

.

MA

.

Ed D

John

Clark.

Mary Norton.

BS

of Communication, and Library Studies.

School

Information,

Rutgers University

Director

.

Janet T Peterson. B A

Richard Bready.

Indei Services

Susan Butz Clendenin, B A Frances Lee Fu. MS Karen McCormack. M A

George T Couston,

MS

in

L

S Head BA ,

MD

Head. Division of General Pediatrics.

M.S.. Director

Researchers

Claire Bolton.

M

Phil

Cheryl Pnhoda.

MLS

David Shannon.

BS

Loranne K Shields. B S

Art

Kristina Vaicikonis.

Executive Art Director

Library Services

MA.

College of Medicine,

Illinois.

Chicago

William

Hammond

Mary S Kayaian.

Art Director

Special Editorial Advisor Alfred

de Simone.

MA

Belisle

Ecole de Bibhotheconomie

de Montreal

Assistant Art Director

Wilma Stevens. B

FA

Artist

Valerie Nelson-Metlay.

Special Consultant for Dinosaurs!

Contributing Artists

Leigh Van Valen. Ph D

Mary-Ann Lupa Ann Tomasic Don Walkoe

Professor of Biology. University of

BA

Permissions Editor Assistant Professor.

Universite

Henry Koval.

Library Services

Start Editor Katie

University of Georgia

Aivme

LaCount. Director

Research and

Ph D

Professor of Child Development.

University of

C

Senior Editor

BA

Steven Waskerwitz.

B.S

Research and Development

Tom McGowen

D

Director

Manufacturing

ERIC Clearing House on

Elementary and Early Childhood Education. University of

Zeleny,

Executive Editor

Professor ol Early Childhood Education

and

O

.

Randi Park, Manager

Editor in Chief

Robert

AB

Production Control

General Chairman. Editorial Advisory Boards. World Book. Inc

BA

Peter Mollman.

Publisher William

Chicago

Photography Director

John S Marshall Photographs Editor Carol Parden

B FA

MLS.

Head

Preface Less than two hundred years ago, no one ever

dreamed there was such a thing as

a dinosaur.

Today, everyone knows about dinosaurs. They are especially popular with children.

children

who can

Even young

barely write their

often familiar with such dinosaur

own names

names

are

as

Tyrannosaurus, Stegosaurus, and Triceratops. In recent years,

we have

learned more and more

about dinosaurs. At one time,

we thought

most dinosaurs plodded along, dragging

We now know

that most of

off the ground, and that quickly. It

now

warm-blooded,

new

many

was once thought

were cold-blooded, scientists

them held

like

think

like birds

ideas about

that

modern

many

could all

that

their tails.

their tails

up

move very dinosaurs

reptiles,

but most

dinosaurs were

and mammals. There are

what caused the

extinction of the

dinosaurs, and even an idea that birds are

descendants of the dinosaurs. This book presents the latest available scientific

information about dinosaurs. Here, then, scientists

believe,

now know

for sure, and

is

what

what they

about more than seventy of those exciting

animals of long ago, the dinosaurs!

C

a