Acknowledgments & Disclaimer Author: Cheryl Morrissette

Photo Credits in order of appearance: Tobias Bernhard/zefa/Corbis, Scott B. Rosen/Bill Smith Studio (9), Purestock/Getty Images, Tom Brakefield/Photodisc Blue/Getty Images, Matthew Oldfield, ScubaZoo/Photo Researchers, Inc., W. Gregory Brown/Animals Animals - Earth Scenes, Phillip Colla/Oceanlight.com, Fred McConnaughey/Photo Researchers, Inc., Tyler Fox/Shutterstock, Fred McConnaughey/Photo Researchers, Inc. (2), Mary Beth Angelo/Photo Researchers, Inc., Norbert Wu/Minden Pictures, Neil G. McDaniel/Photo Researchers, Inc., David Hall/Photo Researchers, Inc., Dynamic Graphics Group/Creatas/Alamy, Norbert Wu/Minden Pictures, Mark Smith/Photo Researchers, Inc. Illustrations by Precision Graphics.

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