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| Introduction | |
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| Classification | |
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| Simple Animals | |
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| Cnidarians | |
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| Flatworms and Roundworms | |
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| Segmented Worms | |
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| Mollusks | |
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| Chitons and Tooth Shells | |
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| Gastropods | |
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| Bivalves | |
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| Cephalopods | |
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| Arachnids | |
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| Spiders | |
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| Scorpions, Ticks, and Mites | |
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| Sea Spiders and Horseshoe Crabs | |
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| Crustaceans | |
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| Crabs | |
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| Centipedes and Millipedes | |
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| Insects | |
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| Wingless Insects | |
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| Lice, Thrips, and Webspinners | |
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| Dragonflies, Mayflies, and Stoneflies | |
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| Grasshoppers, Katydids, and Crickets | |
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| Stick Insects, Mantises, and Cockroaches | |
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| Termites and Earwigs | |
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| True Bugs | |
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| Lacewings, Caddisflies, and Fleas | |
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| Beetles | |
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| Flies | |
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| Butterflies | |
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| Moths | |
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| Ants, Bees, and Wasps | |
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| Echinoderms | |
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| Chordates | |
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| Simple Chordates | |
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| Jawless Fish | |
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| Cartilaginous Fish | |
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| Sharks | |
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| Skates, Rays, and Ratfish | |
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| Bony Fish | |
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| Lungfish, Bichirs, and Bonytongues | |
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| Herring and Their Relatives | |
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| Salmon and Their Relatives | |
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| Bristlemouths and Hatchetfish | |
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| Eels | |
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| Carp and Their Relatives | |
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| Characins and Their Relatives | |
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| Catfish and Electric Eels | |
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| Toadfish and Anglerfish | |
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| Codfish and Their Relatives | |
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| Lionfish, Dories, and Oarfish | |
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| Flyingfish, Grunions, and Seahorses | |
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| Perch and Their Relatives | |
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| Triggerfish | |
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| Flatfish | |
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| Amphibians | |
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| Frogs and Toads | |
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| Salamanders and Caecilians | |
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| Reptiles | |
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| Crocodiles and Alligators | |
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| Lizards and Tuataras | |
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| Snakes | |
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| Turtles and Tortoises | |
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| Birds | |
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| Flightless Birds | |
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| Loons, Grebes, and Petrels | |
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| Pelicans and Their Relatives | |
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| Herons and Their Relatives | |
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| Swans, Geese, and Ducks | |
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| Birds of Prey | |
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| Gamebirds | |
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| Cranes and Their Relatives | |
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| Shorebirds | |
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| Jaegers, Gulls, and Terns | |
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| Auks | |
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| Pigeons and Doves | |
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| Parrots | |
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| Owls | |
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| Nightjars and Frogmouths | |
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| Cuckoos and Their Relatives | |
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| Swifts and Hummingbirds | |
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| Trogons and Mousebirds | |
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| Kingfishers and Their Relatives | |
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| Woodpeckers and Toucans | |
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| Perching Birds | |
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| Mammals | |
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| Egg-Laying Mammals | |
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| Marsupials | |
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| Anteaters, Armadillos, Sloths, Pangolins, and Aardvarks | |
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| Moles, Hedgehogs, and Shrews | |
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| Flying Lemurs and Tree Shrews | |
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| Bats | |
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| Primates | |
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| Rabbits, Hares, and Pikas | |
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| Rodents | |
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| Whales, Dolphins, and Porpoises | |
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| Dogs and Foxes | |
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| Bears | |
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| Pandas and Raccoons | |
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| Mustelids | |
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| Genets, Civets, and Mongooses | |
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| Hyenas and Aardwolves | |
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| Cats | |
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| Seals, Sea Lions, and Manatees | |
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| Elephants | |
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| Hyraxes | |
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| Horses, Rhinoceroses, and Tapirs | |
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| Pigs, Peccaries, and Hippopotamuses | |
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| Camels and Their Relatives | |
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| Deer | |
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| Giraffes and Okapis | |
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| Pronghorns | |
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| Antelope, Cattle, and Their Relatives | |
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| Glossary | |
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| Index | |