ABOUT THE AUTHOR
Rebecca E. Hirsch is a PhD-trained scientist and the award-winning author of dozens of books
about science for children. She lives in Pennsylvania with her family and assorted pets.
Copyright © by Focus Readers, Lake Elmo, MN
. All rights reserved. No part
of this book may be reproduced or utilized in any form or by any means without written
permission from the publisher.
Focus Readers is distributed by North Star Editions:
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Produced for Focus Readers by Red Line Editorial.
Content Consultant: Dr. David B. Weishampel, Professor Emeritus, Center for Functional
Anatomy and Evolution, Johns Hopkins University School of Medicine
Photographs ©: Corey Ford/iStockphoto, cover, ; LadyofHats, –
; Paul Fearn/Alamy, ;
Roberto Nistri/Alamy, ; Uwe Lein/AP Images, –; Red Line Editorial, ; Qiu Ju Song/
Shutterstock Images,
; World History Archive/Alamy, ; Pictorum Ikon Images/Newscom,
; Andreas Meyer/Shutterstock Images, –; paocca/iStockphoto, ; De Agostini Picture
Library Universal Images Group/Newscom, ; Akkharat Jarusilawong/Shutterstock Images,
–; Norbert Michalke/ImageBroker/Alamy,
ISBN
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(paperback)
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Library of Congress Control Number:
Printed in the United States of America
Mankato, MN
November,
