809: Peter Blackwell/npl/Minden Pictures. 810: ©UNEP/The Image Works. 811: ©Antti Leinonen/Jupiter Images. 812: TR, ©Roger Steene/Image Quest Marine; BR, ©John F White/ SuperStock; BL, ©Larry West/Photo Researchers, Inc.; BM, David Scharf/Photo Researchers, Inc.; TL, ©Oxford Scientific/Photolibrary Group. 813: ©Dale C. Spartas/CORBIS. 814: BL, ©Dwight Kuhn; BR, ©Dwight Kuhn; T, ©David Tipling/Minden Pictures. 815: ©Thomas Marent/Minden Pictures. 816: Editions Xavier Barral. Photo ©Patrick Gries. 818: BL, ©Stephen Dalton/Minden Pictures; BR, ©Greg Lasley Nature Photography; TR, ©Ingo Arndt, MINDEN PICTURES; TL, MC DONALD WILDLIFE PHOTOG./Animals Animals Enterprises. 819: B, ©DAVID M. DENNIS/Animals Animals - Earth Scenes; T, ©David Tipling/Minden Pictures. 820: T, ©2002 Masa Ushioda/Image Quest 3-D; B, ©Carlos Villoch 2004/Image Quest Marine. 821: ©2002 Masa Ushioda/Image Quest 3-D. 822: ©Nature Picture Library/Alamy. 824: T, ©Fabio Liverani, npl/Minden Pictures; B, Katherine Feng/Globio/Minden Pictures. 825: ©Mitsuaki Iwago/Minden Pictures. 826: T, ©Thomas Marent/Minden Pictures; B, ©Tom Brakefield/CORBIS. 827: B, ©Nigel J. Dennis; Gallo Images/CORBIS; T, ©David Tipling/Minden Pictures. 829: T, ©Michael & Patricia Fogden/Minden Pictures; B, ©Simon King/npl/Minden Pictures. 830: ©Stephen J. Krasemann/Photo Researchers, Inc. 831: B, ©David Bebber/Reuters/Corbis; TMR, ©SuperStock, Inc.; TML, ©Digital Vision Ltd./SuperStock; TR, ©fStop/SuperStock; TL, ©Digital Vision Ltd./SuperStock. 835: ©2002 Masa Ushioda/Image Quest 3-D. 838–839: ©TIM FITZHARRIS/Minden Pictures. 839: Ariadne Van Zandbergen/africanpictures.net. 840: T, ©Polka Dot Images/SuperStock; BL, Ariadne Van Zandbergen/africanpictures.net; TL, ©Dwight Kuhn. 841: ML, Jeff Lepore/Photo Researchers, Inc.; M, Jeff Lepore/Photo Researchers, Inc.; MR, ©Tim Davis/CORBIS. 842: ©INGO ARNDT/Minden Pictures. 844: TM, ©LAZAR, TOM/Animals Animals Enterprises; TL, ©Markus Botzek/zefa/Corbis; TR, ©Konrad Wothe/Minden Pictures; Bkgrnd, ©Slawomir Jastrzebski/istockphoto.com. 845: TL, ©Thomas Wiewandt; TM, ©www.operationmigration.org; TR, ©2005 Jason Hahn Photography; Bkgrnd, ©Slawomir Jastrzebski/istockphoto.com. 846: B, ©Flip Nicklin/Minden Pictures; TMR, ©SuperStock, Inc.; TML, ©Digital Vision Ltd./SuperStock; TR, ©fStop/SuperStock; TL, ©Digital Vision Ltd./SuperStock. 847: ©Dwight Kuhn. 848: T, M. Delpho/Photolibrary Group; B, ©Corbis/SuperStock. 849: Ariadne Van Zandbergen/africanpictures.net. 850: ©Dwight Kuhn. 851: ©Flip Nicklin/Minden Pictures. 853: BL, ©INGO ARNDT/Minden Pictures; MR, ©Dwight Kuhn. 855: Ariadne Van Zandbergen/africanpictures.net. 859: ©PNC/Blend Images/Corbis. 860–861: ©Reuters/Corbis. 861: TR, Walter Smith/Workbook Stock/Jupiter Images. 862: R, DennisMacDonald/PhotoEdit, Inc.; L, ©Reuters/Corbis. 863: L, Image Source/Photolibrary; ML, Manfred Kage/Peter Arnold; MR, Thomas Deerinck, NCMIR/Photo Researchers, Inc.; R, Ed Reschke/PhotoLibrary Group, Inc. 866: T, ©Greg Ceo/Taxi/Getty Images; B, Caroline Woodham/Stock Connection. 867: Walter Smith/Workbook Stock/Jupiter Images. 868: R, Jupiter Images/Pixland/Alamy Images; L, ©Reuters/Corbis. 869: BR, Corel Professional Photos CD-ROM™; MR, Photodisc/Getty Images; BL, ©Gord Horne/istockphoto.com; T, Walter Smith/Workbook Stock/Jupiter Images. 870: BL, Image Source Pink/Jupiter Images; TL, ©Elena Schweitzer/istockphoto.com; B, Emilio Ereza/Alamy. 871: B, ©Potapova Valeriya/istockphoto.com; T, FoodPix/Jupiter Images; M, ©Maximilian Stock Ltd/photocuisine/Corbis. 872: T, ©Diane Diederich/istockphoto.com; M, Leander/Alamy; B, ©James Steidl/istockphoto.com. 874: B, AP/Wide World Photos; TMR, ©SuperStock, Inc.; TL, ©Digital Vision Ltd./SuperStock; TR, ©fStop/SuperStock; TML, ©Digital Vision Ltd./SuperStock. 875: ©Reuters/Corbis. 877: Eye of Science/Photo Researchers, Inc. 879: B, Meckes/Otawa/SPL/Photo Researchers, Inc.; T, Dr. David M. Martin/Photo Researchers, Inc. 881: Photo Researchers, Inc. 882: ©Richard Hamilton Smith/CORBIS; L, ©Reuters/Corbis. 884: Walter Smith/Workbook Stock/Jupiter Images. 886: Walter Smith/Workbook Stock/Jupiter Images. 889: Jupiter Images/Pixland/Alamy Images. 891: Walter Smith/Workbook Stock/Jupiter Images. 894–895: Jonathan Daniel/Getty Images. 895: Private Collection/Bridgeman Art Library. 896: Jonathan Daniel/Getty Images. 897: Juergen Berger/Photo Researchers, Inc. 898: Private Collection/Bridgeman Art Library. 901: Jonathan Daniel/Getty Images. 902–903: BSIP/Photo Researchers, Inc. 904: MADD Canada. 905: NIH/NIDA. 906: T, Jonathan Daniel/Getty Images; B, Alessandro Della Bella/Keystone/Corbis. 907: Private Collection/Bridgeman Art Library. 909: B, Private Collection/Bridgeman Art Library; T, Jonathan Daniel/Getty Images. 910: T, Dr. Cecil H. Fox/Photo Researchers, Inc.; B, Red Chopsticks/Getty Images. 911: Susumu Nishinag/Photo Researchers, Inc. 912: Ralph C. Eagle Jr./Photo Researchers, Inc. 915: Alessandro Della Bella/Keystone/Corbis. 917: Private Collection/Bridgeman Art Library. 920–921: Joe McNally/Getty Images News. 921: TR, The Schlesinger Library/Radcliffe. 922: Joe McNally/Getty Images News. 924: ©Andrew Syred/Photo Researchers, Inc. 925: The Schlesinger Library/Radcliffe. 926: Photo Alto/Tips Images. 928: B, Jim McIsaac/Getty Images; T, Joe McNally/Getty Images News. 929: T, (c) Ed Reschke/PhotoLibrary Group, Inc.; M, Oxford Scientific Films/PhotoLibrary; B, Ed Reschke/Peter Arnold, Inc. 931: T, Don W. Fawcett/Photo Researchers, Inc.; B, The Schlesinger Library/Radcliffe. 933: NASA. 934: B, Allsport UK/Allsport/Getty Images; TMR, ©SuperStock, Inc.; TML, ©Digital Vision Ltd./SuperStock; TR, ©fStop/SuperStock; TL, ©Digital Vision Ltd./SuperStock. 935: B, The Schlesinger Library/Radcliffe; T, Joe McNally/Getty Images News. 936: Wendell Webber/Botanica/Jupiter Images. 937: Steve Gschmeissner/Science Photo Library/Photo Researchers, Inc. 939: R, JAMES STEVENSON/SCIENCE PHOTO LIB/Custom Medical Stock Photo; L, Dr. P. Marazzi/Science Photo Library/Photo Researchers, Inc.; M, Dr. P. Marazzi/Science Photo Library/Photo Researchers, Inc. 941: L, Photo Alto/Tips Images; T, NASA. 942: European Synchrotron Radiation Facility/CREATIS/Photo Researchers, Inc.; 943: The Schlesinger Library/Radcliffe. 944: ©Salisbury District Hospital/Science Photo Library/Photo Researchers, Inc. 946–947: ©Somos Images/Corbis.947: TR, ©Libby Chapman/istockphoto.com. 948: ©Somos Images/Corbis. 950: ©Libby Chapman/istockphoto.com. 953: Creatas/Jupiter Images. 954: BL, National Cancer Institute/Science Photo Library/Photo Researchers, Inc.; TL, ©Somos Images/Corbis. 955: David M. Phillips/Photo Researchers, Inc. 958: GJLP/Photo Researchers, Inc. 959: T, John Kelly/StockFood/Getty Images; B, ©Libby Chapman/istockphoto.com. 961: ©Libby Chapman/istockphoto.com. 962: BR, BSIP/Photo Researchers, Inc.; TR, Science Photo Library/Photo Researchers, Inc; BL, Science Photo Library/Photo Researchers, Inc. 963: B, Bob Peterson/Upper Cut Images/Getty Images; T, ©Somos Images/Corbis. 964: Susumu Nishinaga/Photo Researchers, Inc. 967: David Madison/Photodisc/Alamy. 968: Arthur Glauberman/Photo Researchers, Inc. 969: B, ©Libby Chapman/istockphoto.com; T, ©Simon Marcus/Photolibrary. 970: ©Gusto/Photo Researchers, Inc. 971: National Cancer Institute/Science Photo Library/Photo Researchers, Inc. 972: David M. Phillips/Photo Researchers, Inc. 973: ©Libby Chapman/istockphoto.com. 976–977: Michael J. Doolittle/The Image Works, Inc. 977: TR, ©Nicholas Monu/istockphoto.com. 978: TR, Alamy Images; TL, Michael J. Doolittle/The Image Works, Inc. 979: ©Nicholas Monu/istockphoto.com. 982: TL, Michael J. Doolittle/The Image Works, Inc. 983: ©Nicholas Monu/istockphoto.com. 984: Astrid & Hanns-Frieder Michler/Photo Researchers, Inc. 988: TL, Michael J. Doolittle/The Image Works, Inc. 989: ©David H. Phillips/Photo Researchers, Inc. 993: B, ©Nicholas Monu/istockphoto.com; T, Claude Edelman/Photo Researchers, Inc. 994: David M. Phillips/Photo Researchers, Inc. 995: BR, Yorgos Nikas/Stone/Getty Images; TL, Michael J. Doolittle/The Image Works, Inc. 996: Scurlock Studio Records, Archives Center, National Museum of American History, Behring Center, Smithsonian Institution. 999: TL, Petit Format/Photo Researchers, Inc.; TR, Claude Edelmann/Photo Researchers, Inc.; BL, ©Neil Bromhall/Photo Researchers, Inc.; BR, Petit Format/Photo Researchers, Inc. 1000: B, Peter Baxter/Shutterstock; T, Simon Puschmann/Bilderberg/Aurora Photos. 1005: ©Nicholas Monu/istockphoto.com. 1008–1009: AP Photo/Thomas Haentzschel. 1009: TR, Christopher Wheeler. 1010: BM, SPL/Photo Researchers, Inc.; BL, NIBSC/SPL/Photo Researchers, Inc; BR, Biophoto Associates/Photo Researchers, Inc.; T, AP Photo/Thomas Haentzschel. 1011: L, Science Photo Library/Photo Researchers, Inc.; R, Eye of Science/Photo Researchers, Inc. 1012: Wood/Custom Medical Stock Photo. 1013: BR, Biophoto Associates/Photo Researchers, Inc.; TR, Christopher Wheeler; BL, HUGH MAYNARD/naturepl.com/NaturePL. 1014: B, Steve Gschmeissner/Photo Researchers, Inc.; T, AP Photo/Thomas Haentzschel. 1019: Steve Gschmeissner/Photo Researchers, Inc. 1020: B, Mary Evan Picture Library/Photo Researchers, Inc.; T, AP Photo/Thomas Haentzschel. 1021: T, Peter Vinten-Johansen, et al., Cholera, Chloroform, and the Science of Medicine: A Life of John Snow (2003), 289; and www.matrix.msu.edu/~johnsnow; BR, Christopher Wheeler. 1022: T, Frank Greenaway/DK/Getty Images; B, Wang Haiyan/China Features/Corbis. 1023: BR, Travel Ink/Gallo Images/Getty Images; L, CAMR/A. Barry Dowswtt/Photo Researchers, Inc.; TR, ©Kevin P. Casey/Corbis. 1024: BL, ©Eric Isselée/istockphoto.com; BR, Volker Steger/Photo Researchers, Inc.; T, AP Photo/Thomas Haentzschel. 1031: Science Source/Photo Researchers, Inc. 1032: Royal Geographic Society Picture Library. DOL•1: Header Bar, ©Harald Theissen/Photolibrary Group; ©2003 James D. Watt/Image Quest 3-D. DOL•2: Header Bar, ©Harald Theissen/Photolibrary Group; FRED BAVENDAM/Minden Pictures. DOL•6: T, ©Science Source/Photo Researchers, Inc.; B, ©Science Pictures Ltd./Photo Researchers, Inc. DOL•6–DOL•7: Header Bar, Scimat/Photo Researchers, Inc. DOL•7: T, ©BIOMEDICAL IMAGING UNIT, SOUTHAMPTON/Photo Researchers, Inc. GENERAL HOSPITAL/SCIENCE PHOTO LIBRARY; Upper ML, ©Science Source/Photo Researchers, Inc.; MR, ©Microfield Scientific Ltd/Photo Researchers, Inc.; Lower ML, ©Microfield Scientific Ltd/Photo Researchers, Inc.; B, CDC. DOL•8: T, ©Stephen & Donna O'Meara/Photo Researchers, Inc.; B, Eye of Science/Photo Researchers, Inc. DOL•8–DOL•9: Header Bar, Dr. Gerhard Wanner/Ludwig-Maximilans Universitat, Munich. DOL•9: T, ©EYE OF SCIENCE/SCIENCE PHOTO LIBRARY/Photo Researchers, Inc.; B, Eye of Science/Photo Researchers, Inc.; ML, Dr. Gerhard Wanner/Ludwig - Maximilans Universitat, Munich; MR, ©Karl Stetter, University of Regensberg. DOL•10–DOL•11: Header Bar, Scenics & Science/Alamy Images. DOL•10: M. I. Walker/Photo Researchers, Inc. DOL•11: L, Eye of Science/Photo Researchers, Inc.; B, Eye of Science/Photo Researchers, Inc.; T, Roland Birke/Peter Arnold Images/PhotoLibrary Group, Inc. DOL•12: ML, M. I. Walker/Photo Researchers, Inc.; T, Steve Gschmeissner/Photo Researchers, Inc.; BL, ©Daniel Clem; BR, Noble Proctor/Photo Researchers, Inc.; MR, Susumu Nishinaga/Photo Researchers, Inc. DOL•12–DOL•13: Header Bar, Scenics & Science/Alamy Images. DOL•13: B, Karen Gowlett-Holmes/Photolibrary New York; M, Biophoto Associates/Photo Researchers, Inc.; TL, Michael Abbey/Photo Researchers, Inc.; TR, Eye of Science/Photo Researchers, Inc. DOL•14: B, Eric V. Grav/Photo Researchers, Inc.; TR, Eye of Science/Photo Researchers, Inc. DOL•14–DOL•15: Header Bar, Scenics & Science/Alamy Images. DOL•15: T, Alain Le Toquin/PhotoLibrary Group, Inc.; MR, Eye of Science/Photo Researchers, Inc.; BL, M. I. Walker/Photo Researchers, Inc.; DOL•16: T, ©Glen Threlfo/Minden Pictures, Inc.; B, ©Jaime Plaza Van Roon/Minden Pictures, Inc. DOL•16–DOL•17: Header Bar, Biophoto Associates/Photo Researchers, Inc. DOL•17: L, Fletcher & Baylis/Photo Researchers, Inc.; R, Bartomeu Borrell/PhotoLibrary Group, Inc. DOL•18: L, Scott Camazine/Photo Researchers, Inc.; M, ©Thomas Marent/Minden Pictures, Inc.; R, Custom Medical Stock Photo, Inc. DOL•18–DOL•19: Header Bar, Biophoto Associates/Photo Researchers, Inc. DOL•19: TR, Biophoto Associates/Photo Researchers, Inc.; TL, Eye of Science/Photo Researchers, Inc.; MR, Biophoto Associates/Photo Researchers, Inc.; B, ©Carr Clifton/Minden Pictures, Inc. DOL•20: TR, ©Naturfoto Honal/Corbis; BR, A. Barry Dowsett/Photo Researchers, Inc. DOL•20–DOL•21: header bar, ©Creatas/Photolibrary Group. DOL•21: M, ©Dr. Richard Kessel/Visual Unlimited/Getty Images; BL, ©Lee W. Wilcox; BR, ©LAURIE CAMPBELL/NHPA/Photoshot; TR, ©Dr. Jeremy Burgess/Photo Researchers, Inc. DOL•22: BL, ©Peter Chadwick/DK Images; BM, ©B. RUNK/S. SCHOENBERGER/Grant Heilman Photography; BR, ©Lee W. Wilcox; TR, ©Craig Tuttle/CORBIS. DOL•23: BM, ©B. RUNK/S. SCHOENBERGER/Grant Heilman Photography; BL, ©GARDENWORLD IMAGES/L THOMAS; BR, ©Dwight Kuhn; Near BL, ©GardenWorldImages/DR GARY BROWN. DOL•24: T, ©Rob Blakers/Photolibrary; BR, ©Jim Brandenburg/Minden Pictures; Near BR, ©Bettmann/CORBIS. DOL•25: BR, ©Gerald Hoberman/Photolibrary Group; ML, ©Alan and Linda Detrick/Photo Researchers, Inc.; MR, ©G. R. Roberts/Omni-Photo Communications, Inc.; TR, ©Peter Chadwick/Dorling Kindersley. DOL•26: T, ©Dr. Merlin D. Tuttle/Photo Researchers, Inc. DOL•27: MR, Sangtae Kim. Sangtae Kim, Mi-Jeong Yoo, Victor A. Albert, James S. Farris, Pamela S. Soltis and Douglas E. Soltis. 2004. Phylogeny and diversification of B-function MADS-box genes in angiosperms; evolutionary and functional implications of a 260-million-year-old duplication. American Journal of Botany 91:2102-2118. Used by permission of the Botanical Society of America; T, ©xyno6/istockphoto.com; BR, ©Florida Images/Alamy; BL, ©HUBAUT Damien/Age Fotostock. DOL•28: Near ML, Mafuta/istockphoto.com; TR, ©Trevor Sims/GardenWorld Images; ML, ©LARRY LEFEVER/Grant Heilman; Near MR, ©HOWARD BUFFETT/Grant Heilman Photography; BL, ©KirsanovV/istockphoto.com; BR, ©Kim Taylor/npl/Minden Pictures. DOL•29: B, ©Creatas/SuperStock; TM, ©WILLIAM MANNING/Grant Heilman Photography; TR, ©Martin Siepmann/Age Fotostock; ML, ©Michael Valdez/istockphoto.com; MR, ©Stephen Hayward/DK IMAGES. DOL•30: T, ©ZSSD/Minden Pictures; B, Stephen Fairclough, King Lab. DOL•30–DOL•31: header, ©Corbis/SuperStock. DOL•31: BL, Masa Ushioda/Image Quest Marine; TR, Masa Ushioda/Image Quest Marine; BR, ©Daniel L. Geiger/SNAP/Alamy. DOL•32: T, ©Michael Durham/Minden Pictures; B, Andrew J. Martinez/Photo Researchers, Inc. DOL•33: B, ©Michael Durham/Minden Pictures; M, Image by: Wernher Krutein/Photovault.com; TR, ©Hiroya Minakuchi/Minden Pictures. TL, Peter Parks/Image Quest Marine. DOL•34: T, ©AP Photo/Ed Andrieski; B, ©age fotostock/SuperStock. DOL•35: T, ©Justine Gecewicz/istockphoto.com; MR, ©Mark Moffett/Minden Pictures; BR, ©Kim Taylor/Minden Pictures; BL, ©Colin Keates/DK Images. DOL•36: T, ©Stephen Dalton/Minden Pictures; MR, Kim Taylor/npl/Minden Pictures; BR, ©Joke Stuurman-Huitema/Foto Natura/Minden Pictures; BL, ©Cisca Castelijns/Foto Natura/Minden Pictures. DOL•36–DOL•37: Bkgrnd, ©Stephen Dalton/Minden Pictures. DOL•37: Centipede, ©DAVID M. DENNIS/Animals Animals - Earth Scenes; T, ©Kim Taylor/npl/Minden Pictures; Ant, ©Piotr Naskrecki/Minden Picture; Bee, ©Kim Taylor/npl/Minden Pictures; Ladybug, Ingo Arndt/Minden Pictures; Fly, ©Heidi & Hans-Jurgen Koch/Minden Pictures; BR, ©Piotr Naskrecki, Minden Picture; Green Beetle, Kim Taylor/npl/Minden Pictures; Purple Beetle, Michael and Patricia Fogden/Minden Pictures. DOL•38: B, ©Sinclair Stammers/Photo Researchers, Inc.; T, ©Dr. Richard Kessel & Dr. Gene Shih/Getty Images. DOL•38–DOL•39: B, ©Sinclair Stammers/Photo Researchers, Inc. DOL•39: TR, ©2007 Jez Tryner/Image Quest Marine; BL, ©Volker Steger/Photo Researchers, Inc. DOL•40: BL, ©Leslie Newman & Andrew Flowers/Photo Researchers, Inc.; TR, ©Kåre Telnes/Image Quest Marine. DOL•41: T, ©Carlos Villoch 2004/Image Quest Marine; BL, John Anderson/Animals Animals/Earth Scenes; BR, ©FABIO COLOMBINI MEDEIROS/Animals Animals - Earth Scenes. DOL•42: R, ©2002 Peter Herring/Image Quest 3-D; Bkgrnd, Flip Nicklin/Minden Pictures. DOL•43: B, Roger Steene/Image Quest Marine; TL, ©Ingrid Visser/Foto Natura/Minden Pictures; TR, Flip Nicklin/Minden Pictures; TM, ©superclic/Alamy. DOL•44: B, Jeff Rotman/Nature Picture Library; TL, ©Kaj R. Svensson/Photo Researchers, Inc.; TR, Jez Tryner/Image Quest Marine. DOL•45: TR, ©FRANS LANTING/Minden Pictures; MR, Joe Dovala/PhotoLibrary Group, Inc.; ML, ©Fred Bavendam/Minden Pictures; BL, ©Roger Steene/Image Quest Marine; TL, Jez Tryner/Image Quest Marine; CR. DOL•46: TL, ©Jurgen Freund/npl/Minden Pictures; BL, ©age fotostock/SuperStock. DOL•47: B, ©T. Burnett-K. Palmer/V&W/Image Quest Marine; ML, ©Heather Angel/Natural Visions; TR, ©2002 Roger Steene/Image Quest 3-D. DOL•48–DOL•49: T, James D. Watt/Image Quest Marine. DOL•48: B, Nature Magazine. DOL•49: BM, ©B. RUNK/S. SCHOENBERGER/Grant Heilman Photography; BR, ©Gerald & Buff Corsi/Getty Images; BL, ©2003 Peter Batson/imagequestmarine. com. DOL•50: RT, Kelvin Aitken/V&W/Image Quest Marine; BL, ©Tui De Roy/Minden Pictures; BR, ©Georgette Douwma/npl/Minden Pictures; ML, EYE OF SCIENCE/SCIENCE PHOTO LIBRARY/Photo Researchers, Inc.; TL, ©James D. Watt/ImageQuest 3 D. DOL•51: B, ©Tom McHugh/Photo Researchers, Inc.; T, ©Tim Fitzharris/Minden Pictures. DOL•52: T, ©Pete Oxford/Minden Pictures; B, ©Michael Durham/Minden Pictures. DOL•53: TL, ©DAVID M. DENNIS/Animals Animals/Earth Scenes; TR, ©Kevin Snair/SuperStock; M, Peter Oxford/Minden Pictures; B, ©Rene Krekels/Foto Natura/Minden Pictures. DOL•54–DOL•55: Mike Parry. DOL•55: M, ©Michael Durham/Minden Pictures; BL, ©Winfried Wisniewski/Foto Natura/Minden Pictures; TR, ©Karl Shone/DK IMAGES; BR, ©Tui De Roy/Minden Pictures. DOL•56: T, ©BERNARD CASTELEIN/Nature Picture Library; B, Journal Nature/Portia Sloan/Getty Images. DOL•57: T, ©age fotostock/SuperStock; BL, ©Michael Durham/Minden Pictures; BR, ©Danny Ellinger/Foto Natura/Minden Pictures. DOL•58: T, ©Tui De Roy/Minden Pictures; BR, ©Michael & Patricia Fogden/Minden Pictures; BL, ©Duncan Usher/Foto Natura/Minden Pictures. DOL•59: LM, ©Tim Fitzharris/Minden Pictures; TL, ©Tom Vezo/Minden Pictures; MR, ©TomVezo.com / MINDEN PICTURES; TR, ©Tom Vezo/Minden Pictures; M, ©Tom Vezo/Minden Pictures; B, Tom Vezo/Minden Pictures. DOL•60–DOL•61: T, ©Suzi Eszterhas/Minden Pictures. DOL•60: B, ©Dave Watts/Nature Picture Library. DOL•61: BL, ©Mitsuaki Iwago/Minden Pictures; BR, ©Pete Oxford/Minden Pictures. DOL•62: TR, ©Gallo Images/CORBIS; BR, ©ZSSD/inden Pictures; TL, ©Ingo Arndt/Nature Picture Library; BL, Todd Pusser/npl. DOL•63: ML, ©Ingo Arndt/Minden Pictures; TR, ©ZSSD/Minden Pictures; Inset, TR, ©Richard Du Toit/Minden Pictures; B, ©Reinhard Dirscherl/age fotostock; TL, ©Creatas/ PhotolibraryGroup; Inset, ML, ©PETER BAUMANN/Animals Animals/Earth Scenes; Inset, TL, ©Jim Clare/Nature Picture Library. DOL•64: TM, ©Michael and Patricia Fogden/Minden Pictures; TR, ©Lockwood & Dattatri/Nature Picture Library; TL, ©Thomas Marent/Minden Pictures; BR, ©Creatas/Photolibrary; M, near L, ©Thomas Marent/Minden Picutres; BL, ©Gerry Ellis/Minden Pictures; MR, ©Elio Della Ferrera/Nature Picture Library; BM, ©Prisma/SuperStock; ML, ©Pete Oxford/Minden Pictures; M, near R, ©Anup Shah/npl/Minden Pictures. A-4: Flip Nicklin/Minden Pictures/Getty Images. A-5: Kenneth Eward/BioGrafx/Photo Researchers, Inc. A-9: Pearson Education/PH School Division. A-12: Peter Casolino/Alamy. A-16: Taunton Yachts. A-17: Richard Haynes. A-19: ©Kevin Fleming/CORBIS. A-20: B, DK Image Library; T, Tom Pantages. A-21: Richard Haynes.
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