Animal Sciences Animal Sciences
animal sciences animal sciences V OLUME 4 Per–Zoo Allan B. Cobb, Editor in Chief EDITORIAL BOARD Editor in Chief Allan B. Cobb Science Educator, Austin, Texas Associate Editors Amy Bryan Science Educator, Walnut Creek Elementary, Austin, Texas Andrew Gluesenkamp Section of Integrative Biology, University of Texas, Austin Elliot Richmond Science Educator, Astronomy Department, Austin Community College EDITORIAL AND PRODUCTION STAFF Kate Millson, Project Editor Linda Hubbard, Editorial Director Shawn Beall, Alja Collar, Bernard Grunow, Gloria Lam, Matthew May, Mark Mikula, Nicole Watkins, Contributing Editors Michelle DiMercurio, Senior Art Director Rita Wimberley, Buyer David Salamie, Kenneth Shepherd, Proofreaders Ellen Davenport, Indexer Julie Juengling, Lori Hines, Permissions Associates Consulting Schools Pocatello High School, Pocatello, Idaho Teacher: Eric Rude Swiftwater High School, Swiftwater, Pennsylvania Teacher: Howard Piltz Douglas Middle School, Box Elder, South Dakota Teacher: Kelly Lane Medford Area Middle School, Medford, Wisconsin Teacher: Jeanine Staab Macmillan Reference USA Elly Dickason, Publisher Hélène G. Potter, Editor in Chief ii Copyright © 2002 by Macmillan Reference USA, an imprint of the Gale Group All rights reserved. No part of this book may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without per- mission in writing from the Publisher. Macmillan Reference USA The Gale Group 1633 Broadway 27500 Drake Rd. New York, NY 10019 Farmington Hills, 48331-3535 Printed in the United States of America 1 2 3 4 5 6 7 8 9 10 Library of Congress Cataloging-in-Publication Data Animal Sciences / Allan B. Cobb, editor in chief.
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