Photograph credits Artville (p. 16 left); Australian Picture Library: Corbis (pp. 1 left and centre, 2, 3 top left, 5 top, 7, 13 top left); Minden Pictures (p. 13 top right); Corbis Royalty Free: (pp. 1 second from left, 8, 10); Digital Vision (PP. 1 right, 3 top left); Getty Images (p. 12); Nature Focus (p. 13 bottom left); Nature Picture Library (p. 3 bottom left); Photodise (pp. 6, 16 second and third from left); Photolibrary.com (front cover, 3 top right, 5 bottom, 9, 13 bottom right, 15): Stock Photos: Zefa (p. 4); TRANZ: Corbis (pp. 1 second from right, 11, 14) Life in a Shell International Edition 2008 Exclusive rights by McGraw-Hill Education (Asia), for manufacture and export. This book cannot be re-exported from the country to which it is sold by McGraw-Hill. This International Edition is not to be sold or purchased in North America and contains content that is different from its North American version. © 2004 Mimosa Publications All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written consent of the publisher, including, but not limited to, in any network or other electronic storage or transmission, or broadcast for distance learning. Some ancillaries, including electronic and print components, may not be available to customers outside the United States. 10 09 08 07 06 05 24 23 22 21 20 MPM When ordering this title, use ISBN: 978-007-127565-1 or MHID: 007-127565-7 Printed in Singapore Copyright Page
Life in a Shell Contents Creatures in Shells 2 Snails 4 Turtles and Tortoises 6 Crabs and Lobsters 8 Hermit Crabs 10 Open and Shut 12 On the Beach 14 Index 16
Creatures in Shells Some creatures have shells. Their shells protect them.
Snails A snail has a shell on its back. When there is danger, a snail pulls its whole body inside its shell.
Turtles and Tortoises A turtle has a shell on its back and under its body. When there is danger, a turtle pulls its head and legs inside its shell.
Crabs and Lobsters Lobsters have shells that cover them all over. So do most crabs.
Hermit Crabs A hermit crab does not have a shell on its body. Hermit crabs live in other creatures' empty shells.
Open and Shut Some shellfish have shells that can open and shut. When the shellfish is in danger, it snaps its shell shut!
On the Beach Some shells on the beach still have creatures living in them. They need to be under water for several hours a day. This happens when the tide comes in.
Index clams 12-13 scallops 13 crabs 8-11 sea otters 12 exoskeleton 8 sea snails 5 hermit crabs 10-11 seashells 14:15 lobsters 8-9 snails 4-5 mussels 13 tortoises 6-7 oysters 13 turtles 6-7