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This book has been optimized for viewing at a monitor setting of 1024 x 768 pixels. YOUR INNER FISH YOUR INNER FISH A J O U R N E Y I N T O T H E 3 . 5 - B I L L I O N - Y E A R H I S T O RY O F T H E H U M A N B O DY NEIL SHUBIN P A N T H E O N B O O K S , N E W Y O R K Copyright ? 2008 by Neil Shubin All rights reserved. Published in the United States by Pantheon Books, a division of Random House, Inc., New York, and in Canada by Random House of Canada Limited, Toronto. Pantheon Books and colophon are registered trademarks of Random House, Inc. All illustrations by Kalliopi Monoyios unless otherwise noted. Library of Congress Cataloging-in-Publication Data Shubin, Neil.