Senior Acquisitions Editor: Willem Knibbe

Development Editor: Dick Margulis

Technical Editor: Adam Audette

Production Editor: Dassi Zeidel

Copy Editor: Liz Welch

Editorial Manager: Pete Gaughan

Production Manager: Tim Tate

Vice President and Executive Group Publisher: Richard Swadley

Vice President and Publisher: Neil Edde

Book Designer: Franz Baumhackl

Compositor: Maureen Forys, Happenstance Type-O-Rama

Proofreader: Rebecca Rider

Indexer: Ted Laux

Project Coordinator, Cover: Katie Crocker

Cover Designer: Ryan Sneed

Cover Image: © Tom Merton / OJO Images / Getty Images

Illustrations used with permission by Gradiva Couzin. Copyright © Gradiva Couzin.

Copyright © 2011 by Wiley Publishing, Inc., Indianapolis, Indiana

Published simultaneously in Canada