aardvark Aardvarks are large African mammals that eat ants. The name means "Earth pig."	Acrocanthosaurus Acrocanthosaurus was huge, spine-backed, meat-eating dinosaur.	African elephant The African elephant is the biggest land animal. It has large ears and a long trunk.	African penguin The African penguin is a small, flightless bird that lives on islands off the coast of southern Africa.	African wild cat The African wild cat is a fierce cat and a fast hunters.
African wild dog The African wild dog hunts in packs in Africa.	agouti The agouti is a large, short-tailed rodent from rainforests in the Americas.	Airedale terrier The Airedale terrier is a dog that was originally bred in England.	Alamosaurus Alamosaurus was a huge, long-necked, plant-eating dinosaur that had a whip-like tail. Fossils have been found in Texas.	Alaskan malamute The Alaskan malamute is a powerful sled dog from Alaska.
albatross The albatross is web-footed bird that can fly for a long period of time.	Albertosaurus Albertosaurus was a large, meat-eating dinosaur, related to T. Rex.	alligator Alligators are large reptiles that have huge jaws and large teeth.	Allosaurus Allosaurus was a huge, meat-eating dinosaur.	alpaca The alpaca is a South American mammal related to and smaller than the llama.
amoeba An amoeba is a tiny, one-celled animal. Amoeba is also spelled ameba.	amphibian Amphibians are animals that live in the water during their early life, but usually live on land as adults. They include frogs, toads, newts, salamanders, and others.	anaconda The anaconda is the biggest snake in the world.	angelfish Angelfish are brightly-colored fish that live in warm water.
angelshark Angelsharks are sharks that have flat bodies and live on the ocean floor.	animals You can see lots of animals at the zoo.	animal tracks Animals make tracks when they walk or run.	Ankylosaurus Ankylosaurus was a plant-eating, armored dinosaur.	ant Ants are small, social insects that are found worldwide.
anteater Anteaters are mammals with very long snouts. They are from South and Central America.	antelope Antelopes are graceful mammals with beautiful horns.	antlers Antlers are hard, branch-like growths on the head of some mammals- they are shed yearly. Many animals, like reindeer, have antlers.	Apatosaurus Apatosaurus was a huge, plant-eating dinosaur. It used to be called Brontosaurus.	ape Chimpanzees, orangutans, and gorillas are apes.

aquarium You can look at fish in an aquarium.	arachnid Arachnids are animals that have eight jointed legs, an exoskeleton, and a two-part body. Spiders, scorpions, and ticks are arachnids.	Archelon Archelon was a marine turtle that was the size of a car. It lived during the time of the dinosaurs.	Arctic animals Animals that live in the Arctic have adapted to withstand very cold temperatures.
Arctic hare This white hare lives in the Arctic and has huge hindfeet.	Arctic tern The Arctic tern is a small bird that flies from the Arctic to the Antarctic and back again each year.	Arctic wolf Arctic wolves are meat-eaters that live in northern Canada.	armadillo An armadillo is a small, burrowing, armored mammal.
assassin bug Assassin bugs are a type of insect that eats other insects.	Avimimus Avimimus was a bird-like dinosaur that ate meat and had a long beak.	aye-aye The aye-aye is an unusual, nocturnal primate (a type of mammal) that lives in Madagascar (an island off the coast of Africa).	baboon The baboon is a large monkey with a long snout and large cheek pouches.	bacterium A bacterium (plural bacteria) is a primitive, single-celled organism.
badger The badger is a nocturnal mammal with a black-and-white striped face.	bald eagle The bald eagle is a large bird of prey. It is the symbol of the USA.	bandicoot Bandicoots are marsupials with pointy snouts. It lives in Australia and New Guinea.	Barosaurus A huge, long-necked, whip-tailed, plant-eating dinosaur that lived the Jurassic period.
basilisk The basilisk is a South American lizard that can walk on water.	basking shark The basking shark is huge and eats very tiny animals that float in the ocean.	basset hound The Basset Hound is a lively and devoted dog that has short legs and long, droopy ears. It was originally bred to hunt rabbits and hares.	bassoon The bassoon is a large woodwind instrument with a double reed. It can play very low notes	bat Bats are the only flying mammal.
beagle The beagle is a friendly, playful dog. It was originally bred as a rabbit hunter.	beak A beak is the hard, outer part of a some animal's mouth. Birds, octopuses, squid, and other animals have beaks. Some dinosaurs had them too.	bear A bear is a big, furry mammal.	beaver The beaver is a large rodent that builds dams and dens.

bee Bees are flying insects that live in a hive. Some bees make honey. Bees are important plant pollinators; they fertilize seeds when they fly from flower to flower, collecting nectar.	beetle A beetle is an insect.	beluga whale The beluga is a small, white, toothed whale that lives mostly in cold, arctic waters.	bighorn sheep The bighorn sheep is a wild brown sheep from mountains and deserts of North America.	bilby The bilby (also known as the rabbit-eared bandicoot) is a small marsupial with long ears. It lives in Australia and New Guinea.
binturong The binturong is a dark, furry mammal from southeast Asia.	biome A biome is the natural place in a particular climate where many plants and animals live. Some biomes include the rainforest, tundra, and desert.	biped A biped is an animal that walks on two legs. People are bipeds. Tyrannosaurus rex was a biped.	bird Birds have feathers and wings. Most birds can fly.

bison The Bison (also called the American Buffalo) is the heaviest land animal in North America.

black bear The black bear is a big bear that can be black or brown colored.

black bear hamster The black bear hamster is a docile, black, short-haired hamster.

blackbird Blackbirds are black!

black widow spider The black widow is a very poisonous black spider with a red hourglass marking.

bloodhound The bloodhound is the heaviest hound dog and is an incredible scent tracker.

bluebird The bluebird is a beautiful song bird that is the symbol of many of the states in the USA.

blue jay The blue jay is a beautiful, noisy blue bird.

blue shark The blue shark is a sleek, fast-swimming shark with blue skin.

blue-tongued skink The blue-tongued skink is an Australian lizard that has a long, blue tongue.

blue whale The blue whale is the biggest animal that ever lived. It eats tiny food that it sieves through baleen.

boa constrictor The boa constrictor is a large snake from South and Central America.

bobcat The bobcat is a fierce, short-tailed wild cat from North America.

body Everyone has a body.

bones Bones are hard, structural parts of the body of many animals. We have 206 bones in our skeleton.

bongo The bongo is a large, striped antelope from African forests.	Boston terrier The Boston Terrier is an intelligent, lively, short-haired dog.	bowhead whale The bowhead whale is a large whale that eats tiny food that it sieves through baleen.	Brachiosaurus Brachiosaurus was a huge, plant-eating dinosaur. It had a very long neck.	breaching Breaching is when whales jump high out of the water. Sometimes whales spin around while they are breaching.
Brontosaurus Brontosaurus was a huge, long-necked, plant-eating dinosaur. It is now called Apatosaurus.	brown bear The brown bear is a large bear with a muscular hump on its shoulders.	buffalo The American buffalo (which is actually a bison) is the heaviest land animal in North America.	bug There are lots of bugs in the world. Insects and spiders are bugs.	bull A bull is a male cow.	bulldog The bulldog is a muscular, wrinkled, powerful dog that was originally bred in Britain.

bull shark The bull shark is a dangerous predator that has a flattened snout.

bull snake Also known as the gopher snake and the pine snake, this hissing constrictor lives in North America.

bunny A bunny is a young rabbit.

burrow Burrows are tunnels that some animals dig. Many animals live underground in burrows.

butterfly A butterfly is an insect that has beautiful wings. The butterfly begins its life as caterpillar, and later changes into a butterfly.

caiman The caiman is a meat-eating reptile from South and Central America.

cage Some people keep birds in cages.

calf A calf is a young cow.

Camarasaurus Camarasaurus was a long-necked dinosaur over 60 feet long.

camel Camels are large mammals that live in dry areas. The camel's hump is filled with fat.

Canada goose The Canada goose is a large North American bird that honks.

canary Canaries sing very well.

Cape buffalo The Cape Buffalo is a large, hoofed mammal that lives in African savannas (grasslands).

Cape hunting dog The Cape hunting dog hunts in packs in Africa.

capybara The capybara is the biggest rodent in the world.

cardinal The Northern Cardinal is a bird with a short, wide bill. The male is bright red; the female is brownish-red.

caribou Caribou live in Arctic regions.

carnivore Carnivores are organisms that eat meat.

Carnotaurus Carnotaurus was a meat-eating dinosaur with horns on its head.

cassowary A huge, flightless bird from Australia with a helmet-like crest on its head.

cat Cats are mammals and are great pets. Cats were revered by the ancient Egyptians.

caterpillar A caterpillar eats a lot and will turn into a butterfly or a moth. It is also called a larva.

cave bear The cave bear, Ursus spelæus, is a huge, extinct bear known only from fossils. It lived in Europe and was hunted by Stone Age people.

centipede A centipede is a small predatory animal with many legs.

Ceratosaurus Ceratosaurus was a meat-eating dinosaur from the Jurassic period. It had a small horn on its snout.

Centrosaurus Centrosaurus was plant-eating dinosaur with a long snout horn.

chameleon Chameleons are lizards that can change their skin color.

cheetah The cheetah is the fastest land animal.

chick A chick is a baby chicken. Some other baby birds are also called chicks.

chicken A chicken is a farm animal.

Chihuahua The Chihuahua is a small, alert dog from Mexico.

chimpanzee Chimpanzees are very intelligent animals. These mammals live in western and central Africa.

chinchilla Chinchillas are soft rodents that live high in the Andes Mountains of South America.

chipmunk Chipmunks are rodents that live in North America and Asia.

chrysalis A chrysalis is the stage in a butterfly's life when it is changing from a caterpillar into a butterfly. It is also called the pupa.

cicada A cicada is a flying insect with big eyes and clear wings. It has a very long life cycle and the males make a buzzing sound.

clam Clams are animals with two shells. They burrow under the sand.

claw A claw is a hard, sharp, curved nail on the feet of some animals. Bears, cats, birds, dinosaurs, and many other animals have claws.

clown fish The clown fish is a colorful fish that lives with sea anemones.

coati (pronounced ko-WAH-ti) Coati (also called coatimundi) are long-nosed, long-tailed mammals from the Americas.

cobra Cobras are venomous snakes.

cockatoo Cockatoos are birds that have a large, feathery crest and a hooked bill. They are from Australia and Indonesia.

cocker spaniel The cocker spaniel is a friendly, obedient dog that was originally bred to hunt birds.

cocoon A cocoon is a silky covering made by a caterpillar. The cocoon protects the developing moth.

Coelacanth The Coelacanth (pronounced SEE-la-canth) is a primitive fish that was thought to have been extinct for millions of years, but a living Coelacanth was caught in 1938.

collie The collie is a friendly, intelligent, and obedient dog

Compsognathus Compsognathus is the smallest dinosaur yet discovered.

conch The conch is a large, shelled animal from warm seas.

cookiecutter shark The cookiecutter shark is a small shark that takes circular bites out of its prey. Also known as the luminous or cigar shark.

coral Coral is a tiny ocean animal that lives in colonies. Some corals leave a hard, stony skeleton when they die.

coral reef Coral reefs are warm, clear, shallow ocean habitats that are rich in life.

Corythosaurus Corythosaurus was a plant-eating, duck-billed dinosaur that was about 30 feet long.

cougar A long-tailed wild cat with no spots. It is also known as the puma, panther, mountain lion, and catamont.

cow Most of the milk we drink comes from cows.

coyote Coyotes are meat-eating animals that are related to wolves.

coypu Coypus (also called nutrias) are semi-aquatic rodents that are originally from South America.

crab A crab has a hard shell and eyes on stalks on its head.

crane The crane is a wading bird with a long neck, a long bill, and long legs.

crayfish Crayfish are freshwater crustaceans with four pairs of walking legs.

cricket Crickets are noisy, jumping insects.

crocodile Crocodiles are meat-eating reptiles with a long, tapered snout.

crow A crow is a very smart black bird.

cuckoo Cuckoos are birds whose call sounds like coo-coo.

cuttlefish The cuttlefish is a close relative of the octopus and the squid.

dachshund The Dachshund is an active dog with a long body and short legs.

Dalmatian The Dalmatian is a white dog that has dark spots.

darkling beetle The mealworm is the larval stage of the darkling beetle.

deer Deer are long-legged mammals that have hoofed, two-toed feet.

Deinonychus Deinonychus was a killer dinosaur that was about 5 feet tall. It had a large, sickle-shaped claw on each foot.

Dilophosaurus Dilophosaurus was a meat-eating dinosaur that had two crests on its head.

Dimetrodon Dimetrodon was a prehistoric animal, but not a dinosaur. It had a large sail of skin on its back and was a meat-eater.

dingo The dingo is a wild dog from Australia.

dinosaur Dinosaurs are ancient reptiles that are now extinct. They lived during the Mesozoic Era, from about 230 million to 65 million years ago.

Diplodocus Diplodocus was a huge, plant-eating dinosaur that had a long neck, a small head, and a long, whip-like tail.

Doberman The Doberman is a loyal, intelligent dog.

dodo The dodo is an extinct, flightless bird that lived on an island in the Indian Ocean near Africa.

dog Dogs wag their tails when they're happy.

dogfish shark The dogfish shark is a small, very common shark that is found all over the world. It is not dangerous to people.

dolphin A dolphin is a marine mammal with a long nose and teeth. Dolphins are whales.

donkey Donkeys can be very stubborn.

dove The dove is a bird that is a symbol of peace.

dragon A dragon is a big, scary, fire-breathing, make-believe beast.

dragonfly A dragonfly is a beautiful, flying insect that can hover in the air.

Dryosaurus Dryosaurus was an early, plant-eating dinosaur.

duck Ducks are birds that have webbed feet and a flattened bill. They swim well and live near the water.

duckling A duckling is a young duck.

duck-billed platypus The Duck-billed Platypus is a primitive mammal from Australia that lays eggs and has a poisonous spike on its leg.

dugong Dugongs are gentle, slow-swimming, aquatic mammals.

Dunkleosteus Dunkleosteus is an extinct, heavily armored fish that lived about 400 million years ago.

eagle The eagle is a large bird of prey. It has a hooked bill and sharp talons.

earthworm An earthworm is a little animal with a long, soft body and no legs.

earwig An earwig is an insect with long pincers at the tip of its abdomen.

echidna The echidna is a primitive, spiny, egg-laying mammal from Australia and New Guinea. It is also called the spiny anteater.

echolocation In echolocation (also called sonar), a high-pitched sound (usually clicks) is sent out. The sound bounces off the object and some returns. The returning echo is interpreted to determine the object's shape, direction, distance, and texture. Dolphins (and other toothed whales) and some bats use sonar to navigate and find prey.

Edmontonia An armored, plant-eating dinosaur from North America.

Edmontosaurus Edmontosaurus was a duck-billed dinosaur.

eel The eel is a long, snake-like fish.

egret The egret is a large wading bird.

Elasmosaurus Elasmosaurus was a huge marine reptile - a plesiosaur, not a dinosaur.

electric eel The electric eel is a fish that can generate electricity.

elephant The elephant is a big, gray animal with a trunk.

elephant seal The elephant seal is a huge seal that lives in the Pacific Ocean.

elk Elk are large mammals that are related to deer.

emerald tree boa The emerald tree boa is a tree-dwelling nocturnal snake from South American rain forests.

emperor angelfish The emperor angelfish is a brightly-colored, flattened fish that lives in shallow warm waters.

emperor penguin The emperor penguin is the largest penguin; it lives on ice packs in Antarctica.

emu The emu is a large Australian bird that cannot fly.

endangered species Endangered species are types of animals or plants that may become extinct soon.

Eohippus Eohippus was a tiny horse that lived 50 million years ago. It is extinct.

Eoraptor Eoraptor is the oldest known dinosaur.

Euoplocephalus Euoplocephalus was an armored, plant-eating dinosaur.

extinct When a group of animals or plants goes extinct, they are gone forever. Some extinct animals include dinosaurs, saber-toothed cats, and dodo birds.

Fabrosaurus Fabrosaurus was small, primitive plant-eating dinosaur from South Africa.

falcon The falcon is a fast-flying bird. It prey upon other birds.

fawn A fawn is a young deer.

feather Birds have feathers.

ferret Ferrets are a type of weasel.

fiddler crab The fiddler crab is small crab that lives on beaches. The male fiddler crab has one enlarged claw.

fin Fish use their fins to swim.

fin whale The fin whale is a very large baleen whale. It is the second largest animal in the world.

firefly The firefly (also known as the lightning bug) is a glowing, flying insect.

fish Fish live in the water and breathe with gills.

fish bowl Fish swim around and around a fish bowl.

flamingo The flamingo is a pink bird that eats shrimp.

flea A flea is a tiny insect that is a parasite on other animals. Many cats and dogs get fleas.

flipper Flippers are wide, flat limbs that many marine animals use for swimming. Seals and whales have flippers.

flukes The tail of whales and dolphins is called the flukes (each half of the tail is called a fluke). Flukes have no bones in them. Whales swim by moving their flukes up and down in the water (fish move their tail left to right).

fly The fly is a small, flying insect.

flying squirrel Flying squirrels glide from trees, using a loose flap of skin between their legs and arms.

foal A foal is a young horse.

food chain A food chain is is the sequence of who eats whom in a biological community (an ecosystem) to obtain nutrition. A food web is all of the interactions between predators and prey in which plants and animals obtain food in an ecoystem.

fossa The fossa is a meat-eating mammal from the island of Madagascar.

fossil Fossils are mineralized impressions or casts of ancient animals and plants.

fox The fox is a meat-eating mammal with a long, bushy tail.

frilled lizard A lizard with a huge neck frill that it can raise to scare its enemies.

frog Frogs are amphibians. They begin as eggs, hatch into tadpoles (who breathe with gills), and grow up to be frogs (who breathe with lungs and lose their tail).

fruit bat Fruit bats are large flying mammals that eat fruit and flowers.

fur Fur is soft, thick hair. Many animals have fur, including cats, seals, and bats.

gazelle Gazelles live in herds in Africa.

gecko Geckos are the only lizards that make noise.

gerbil Gerbils are small rodents that some people keep as pets.

Gerrothorax Gerrothorax was an ancient amphibian that lived over 200 million years ago - it is extinct.

giant anteater The Giant Anteater is the biggest anteater. It is about 7 feet long.

giant ground sloth A huge, extinct mammal that lived during the last Ice Ages. It is also called Megatherium. This plant-eater had hook-like claws.

giant panda The giant panda is a black and white bear from China.

giant squid Giant Squid swim deep in the oceans. They have ten arms and their eyes are the size of basketballs.

gibbon Gibbons are rare, small, slender, long-armed, tree-dwelling apes from Asia.

Giganotosaurus Giganotosaurus was the largest meat-eating dinosaur.

Gila monster The Gila monster is a venomous lizard from deserts of southwestern North America. It is nocturnal (most active at night).

gills Gills are organs that fish and amphibians use to breathe underwater.

giraffe The giraffe is the tallest land animal.

Glyptodon Glyptodon was a car-sized armadillo that lived during the Ice Ages.

gnat A gnat is a very small flying insect.

gnu The gnu is a fast-running grass-eater from Africa. It is also known as the wildebeest.

goat Goats are sure-footed, hoofed mammals.

goblin shark The Goblin shark has a very long snout.

golden retriever A friendly, intelligent, energetic, and very popular dog.

goldfinch The goldfinch is a small, seed-eating bird that lives in North America.

goldfish A goldfish is a type of carp that makes a nice pet.

goose Geese are migrating birds that honk!

gorilla Gorillas are intelligent mammals from Africa. They are in danger of extinction.

gosling A gosling is a baby goose.

grasshopper The grasshopper is an insect that hops and flies. It can make noises by rubbing its legs together.

gray whale The gray whale is a baleen whale that eats tiny organisms from the mud on the bottom on the ocean.

gray wolf Gray wolves are endangered meat-eaters from the North America.

Great Dane The Great Dane is a large, short-haired dog that was originally bred to hunt large game.

great horned owl The great horned owl is a large bird of prey from North and South America.

great white shark The Great White shark is a large, meat-eating fish.

greyhound The greyhound is the fastest breed of dog for short distance runs.

grizzly bear The grizzly bear is a large bear with a muscular hump on its shoulders.

groundhog The groundhog is a rodent that is also called the woodchuck.

guinea pig The guinea pig is a small, tailless rodent that is sometimes kept as a pet.

gull Gulls are birds that live near oceans and lakes.

guppy Guppies are a type of small tropical fish.

habitat A habitat is the natural place where a plant or an animal lives. For example, a toucan's habitat is the rainforest.

Hadrosaurus A duck-billed, plant-eating dinosaur from the late Cretaceous period.

hamster A hamster is a small rodent that some people keep as pets.

hammerhead shark The hammerhead shark has a head shaped like a hammer.

hare Hares have very long hind legs and long ears. Unlike rabbits, the young are born fully haired.

harlequin bug This small agricultural pest is brightly-colored.

harp seal The harp seal is a marine mammal that lives in the North Atlantic and in the Arctic Ocean.

harpy eagle The harpy eagle is one of the largest eagles in the world. It lives in rainforests of Central America and South America.

hatchetfish Hatchetfish are oddly-shaped fish from South and Central America.

hawk The hawk is a bird of prey, a raptor.

hedgehog A hedgehog is a small mammal with a spiny coat.

hen A hen is a female chicken. Hens lay eggs.

hermit crab Hermit crabs are crabs that lack a hard shell; they use a discarded shell for protection.

heron A large wading bird with distinctive plumage and a long, sharp bill.

Heterodontosaurus Heterodontosaurus was a small dinosaur with three types of teeth.

hibernate Some animals hibernate during winter; they go into a very deep sleep-like state during freezing weather. They awaken only when the weather warms.

hippopotamus The hippopotamus (also called the hippo) is a large mammal that stays in the water a lot. This animal is nocturnal (most active at night).

hive A hive is a home for bees.

hoatzin (pronounced wat-sin) The hoatzin is a strong-smelling, crested bird from South America that has claws on its wings when it is young.

hobo spider The hobo spider is an aggressive, poisonous spider.

hog A hog is a hoofed mammal that is similar to a pig.

honey bee Honey bees are insects that live in a hive and make honey.

honeycomb Bees make honeycomb to store food and shelter their young.

hoof A hoof is a hard, protective covering on some animals' feet. Some animals that have hooves are pigs, horses, zebras, and deer.

horn Horns are bony, permanent, hollow that grow in pairs on the head of some animals. Many animals have horns, including antelopes, bulls, sheep, and Triceratops.

hornet A hornet is a kind of wasp, a flying, stinging insect.

horse Horses are very fast runners.

horseshoe A horseshoe is a metal protector for a horse's hoof.

horseshoe crab The horseshoe crab is a hard-shelled animal that lives in warm coastal waters on the sea floor.

hound Hounds are dogs that were originally bred to hunt animals.

house fly The common house fly is a small, flying insect.

howler monkey The howler monkey is the loudest monkey in the world.

hummingbird Hummingbirds are tiny birds that drink flower nectar. They can hover in the air and even fly backwards.

humpback whale Humpbacks are very acrobatic whales that sing beautiful, complex songs.

husky The husky is a hard-working, fast-running sled dog that was originally from Siberia.

hyena Hyenas are meat-eating animals that scavenge and hunt prey.

Hypsilophodon Hypsilophodon was a small, plant-eating dinosaur.

ichthyosaur Ichthyosaurs were prehistoric reptiles that lived in the sea.

Ichthyosaurus Ichthyosaurus was a dolphin-like marine reptile from the time of the dinosaurs.

iguana Iguanas are plant-eating lizards that often live in trees.

Iguanodon Iguanodon was a plant-eating dinosaur.

impala The impala is a high-jumping, lightly-built antelope from southern Africa.

insect Insect are animals that have six legs, a three-part body and a hard exoskeleton.

Irish setter The Irish setter is a friendly, energetic, and high-spirited dog that was originally bred in Ireland.

jack rabbit Jack rabbits are hares; they have very long legs and long ears.

Jack Russell terrier The Jack Russell terrier is a feisty dog that was originally bred to drive small animals from their burrows.

jaguar The jaguar is a large, spotted wild cat from South and Central America.

jaws Jaws let you open and close your mouth and take bites.

jay Jays are beautiful, noisy birds.

jellyfish Jellyfish are animals that have stinging tentacles.

jerboa The jerboa is a small, long-tailed rodent that hops.

joey A joey is a baby kangaroo.

jumping bean moth A jumping bean moth begins its life as an egg and a caterpillar living in a seed pod (called a jumping bean). This moth is from Mexico.

junco This junco is a small songbird from North America.

kakapo The kakapo is a large, flightless, nocturnal, solitary parrot from New Zealand.

kangaroo The kangaroo is a pouched mammal that hops and uses its muscular tail as a third leg. Its babies are called joeys.

kangaroo rat The kangaroo rat is a small rodent from North America.

Kentrosaurus Kentrosaurus was a spiked, plated dinosaur from the Jurassic period.

killer whale Killer whales are also known as orcas. These whales eats hundreds of pounds of fish and marine mammals every day.

king cobra The King Cobra is the largest venomous snake in the world. It lives in India, southern China, and southeast Asia.

kinkajou A long-tailed, nocturnal mammal from rainforests in the Americas.

kitten A kitten is a young cat.

kiwi The kiwi is a chicken-sized flightless bird from New Zealand. It is generally nocturnal (most active at night).

koala The koala is an Australian marsupial (a pouched mammal) that eats mostly eucalyptus leaves. It is not a bear. This animal is nocturnal (most active at night).

koi Koi are a beautiful type of carp.

Komodo dragon The Komodo dragon is the biggest lizard in the world and a fierce killer.

kookaburra The kookaburra is an Australian bird whose call sounds like laughing.

krill Krill are small marine animals that are eaten by many big animals, including some whales.

Kronosaurus Kronosaurus is a large extinct marine reptile that lived during the time of the dinosaurs.

Labrador retriever The Labrador retriever is an intelligent and even-tempered dog. It is the most popular dog breed in the USA.

ladybug Ladybugs are flying insects that are useful in a garden because they eat many plant-eating insects.

lamb A lamb is a baby sheep.

Lambeosaurus Lambeosaurus was a large, crested dinosaur.

lanternfish Lanternfish are fish that have light-producing organs and very large eyes.

larva A larva is an immature stage in the development of some animals. Larvae eat a lot and will eventually turn into adults. Butterfly larvae are called caterpillars.

Leaellynasaura An Australian plant-eating dinosaur with large eyes.

leafcutter ant Leafcutter ants are fungus farmers - they grow their own food.

lemming Lemmings are small, short-tailed rodents.

lemon shark The lemon shark is a yellowish shark.

lemur Lemurs are large-eyed mammals from Madagascar, an island off the coast of Africa.

leopard Leopards are widely-distributed, spotted wild cats.

Lesothosaurus Lesothosaurus was a small, plant-eating dinosaur that lived in what is now Africa.

Lhasa apso The Lhasa apso is a small, long-haired dog that was originally bred in Tibet.

lice Lice are tiny insects that live on the skin of other animals; a single one of these insects is called a louse. Lice sometimes live on people's hair.

lightning bug The lightning bug (also known as the firefly) is a glowing, flying insect.

limpet The limpet is a marine animal with a soft body and a flattened, cone-shaped shell.

lion The lion is a meat-eating African mammal. Lions are nocturnal (most active at night). A group of lions is called a pride.

lizard Lizards are a type of reptile.

llama Llamas are domesticated animals that are related to camels.

lobster A lobster lives on the ocean floor and has five pairs of legs. Lobsters have blue blood.

lobtailing Lobtailing is when a whale sticks its tail out of the water into the air, swings the tail around, and then slaps the tail on the water's surface. Lobtailing makes a very loud noise.

longhorn A longhorn is a type of cattle with very long horns.

loris Large-eyed primates from Southeast Asia.

louse A louse is a tiny insect; the plural of louse is lice. They live on the skin of other animals. Lice sometimes live on people's hair.

luna moth The luna moth is a green moth with long hindwing tails and eyespots.

lynx A powerful wild cat from Europe, Eurasia, and North America.

macaroni penguin The macaroni penguin is a penguin from the Antarctic that has a yellow, feathery crest on its head.

macaw Macaws are parrots from rainforests in the Americas.

Maiasaura Maiasauras were dinosaurs that cared for their eggs and young.

mako shark The mako shark is a very fast shark with bluish skin.

mallard The Mallard is a common wild duck.

mammal Mammals are warm-blooded animals with hair that nourish their young with milk.

mammoth Mammoths were large, elephant-like animals that lived during the Ice Ages. They had long hair, long tusks, and finger-like projections on the long trunk.

manatee Manatees are gentle, slow-swimming, aquatic mammals.

mandrill Mandrills are large, brightly-colored monkeys from African rainforests.

man-of-war The Portuguese man-of-war is a floating colony of animals that has very long, stinging tentacles. It lives in warm ocean waters.

manta ray Manta rays are harmless fish and are related to sharks. Mantas are the biggest rays.

marine mammals Marine mammals live in the sea and breathe air. Seals, sea lions, whales, and others are marine mammals.

marsupials Marsupials are mammals whose young are born very immature. Most female marsupials have a pouch in which the young lives. Koalas and kangaroos are marsupials.

mastiff The mastiff is a huge, intelligent, and powerful dog that is often used as a guard dog.

mastodon Mastodons were shaggy, tusked mammals that are now extinct. Mastodons evolved earlier than mammoths and were smaller than mammoths.

meadowlark The meadowlark is a brightly-colored songbird that lives in meadows and grasslands.

mealworm The mealworm is the larval stage of the darkling beetle.

meerkat Meerkats are a type of mongoose that can stand upright. They live in Africa.

Megalodon Megalodon was a giant shark that lived from 25 million to 1.6 million years ago; it is extinct. It may have been over 40 feet (12 m) long. Only fossilized teeth have been found.

Megalosaurus This large meat-eating dinosaur was the first dinosaur named.

megamouth The megamouth is a large, filter-feeding shark that was only discovered in 1976.

Megaraptor Megaraptor was a giant, meat-eating dinosaur with long, sharp toe claws.

metamorphosis Metamorphosis is the transformation of an animal during its life cycle (from larva to adult). For example, the larval stage of butterflies and moths (called the caterpillar) metamorphoses into a winged, flying adult (the adult butterfly or moth).

millipede Millipedes are segmented, plant-eating animals that have many legs.

mink The mink is a small, short-legged member of the weasel family. It lives in wet environments.

moa The moa were huge, extinct, flightless birds from New Zealand.

mockingbird The mockingbird is a North American bird that can mimic the songs of many other birds.

mole Moles are burrowing mammals that are almost-blind.

mongoose Mongooses are sleek, meat-eating mammals.

monkey Monkeys are furry mammals with long, strong tails.

moose A moose is a large type of deer from northern forests.

monarch butterfly The monarch butterfly is a common, poisonous butterfly. Some monarchs migrate long distances.

moray eel The moray eel is a long, snake-like fish that has circular gills.

Morpho butterfly The Morpho butterfly is a bright blue buttterfly from rainforests in South and Central America.

mosquito A mosquito is a small, flying insect that can spread disease as it feeds on blood.

moth Moths are beautiful flying insects that are generally more active at night. They are related to butterflies.

mountain lion A long-tailed wild cat with no spots. It is also known as the puma, panther, cougar, and catamont.

mouse Mice are cute, small rodents with long tails.

musk ox Musk oxen are large, hairy mammals that live in the far north.

muskrat Muskrats are rodents that often build dome-shaped houses.

Mussaurus Mussaurus was a tiny, plant-eating dinosaur from South America. Its eggs were only about an inch long.

mustang Mustangs are wild horses from western North America.

Muttaburrasaurus Muttaburrasaurus was a plant-eating dinosaur with thumb spikes. Its fossils have been found in Australia.

nabarlek The nabarlek is a small wallaby from northern Australia.

naked mole-rat Naked mole-rats are small, almost hairless rodents who live in underground colonies in Africa.

narwhal The narwhal is an Arctic whale; the male has a huge tooth.

nautilus The nautilus is a sea animal related to the squid and octopus!

nene The nene is Hawaii's state bird. It is an endangered goose that lives on volcanic slopes.

nest Some animals make nests to hold their babies - even some dinosaurs built nests for their eggs.

newt Newts are brightly-colored salamanders, a type of amphibian.

nightingale The nightingale is a bird that sings beautiful songs.

nocturnal Nocturnal animals are more active at night. Bats are nocturnal.

Nothosaurus Nothosaurus was a fish-eating reptile from the Mesozoic Era. It is extinct.

numbat The numbat is a pouchless marsupial from Australia. It eats termites.

nurse shark The nurse shark is a large predator that lives in warm water in coral reefs.

nuthatch The nuthatch is a small perching bird that can climb down trees and opens nuts using its bill like a hatchet.

nutria Nutrias (also called coypus) are semi-aquatic rodents that are originally from South America.

ocelot Ocelots are wild cats from rainforests and grasslands in the Americas.

octopus The octopus is an ocean animal (a cephalopod) that has eight arms and lives on the sea floor. The plural of octopus is octopuses.

okapi The okapi is a nocturnal, giraffe-like mammal from African rainforests.

old English sheepdog The old English sheepdog is an affectionate, long-haired dog that was originally bred in Great Britain.

opossum The Virginia opossum is the only marsupial from North America.

orangutan Orangutans are large, tree-dwelling apes from rainforests in southeast Asia.

orb weaver The orb weaver is a type of spider that builds a loosely-woven web.

orca Orcas are also known as killer whales. An orca eats hundreds of pounds of fish and marine mammals every day.

oriole The oriole is a black and orange bird that eats fruit and nectar. It builds a hanging nest.

Ornithomimus Ornithomimus was an ostrich-like dinosaur.

oropendola The crested oropendola is a tropical black bird that makes long, pendulous nests.

oryx Oryx are long-horned antelopes from dry areas in Africa and Asia.

ostrich The ostrich is the largest bird. It can't fly, but it runs very fast.

otter An otter is a playful aquatic mammal.

Ouranosaurus Ouranosaurus was a sail-backed, plant-eating dinosaur.

Oviraptor Oviraptor was a small, omnivorous dinosaur.

owl Owls are birds of prey that have large eyes and very good eyesight. Most owls hunt at night.

ox Oxen are large, hairy mammals that live in the far north.

oyster The oyster is a soft-bodied marine animal that is protected by two hard shells.

Pachycephalosaurus Pachycephalosaurus was a plant-eating, dome-headed dinosaur.

painted lady The painted lady is a common and brightly-colored butterfly.

painted turtle The painted turtle is a common turtle that lives in ponds, marshes and slow-running rivers in North America.

paleontologist A paleontologist is a scientist who studies ancient life (like dinosaurs), mostly by looking at fossils.

paleontology Paleontology is the study of ancient life, mostly through fossil evidence.

panda Pandas are black and white bears from China.

pangolin The pangolin is an insect-eating mammal that has protective scales on its body.

panther A long-tailed wild cat with no spots. It is also known as the puma, cougar, mountain lion, and catamont.

Parasaurolophus Parasaurolophus was a plant-eating, duck-billed dinosaur.

parrot The parrot is a beautiful bird that can imitate sounds very well.

peacock The peacock is a beautiful bird from india. The male has a large train of feathers.

Pekingese The Pekingese is a small, long-haired dog with a flattened face. It was originally bred in China as a royal companion dog.

pelican The pelican is fish-eating bird with a huge, pouched bill.

penguin Penguins are birds that cannot fly but swim very well.

Pentaceratops A plant-eating dinosaur with horns and a big frill.

peregrine falcon The peregrine falcon is the fastest-flying bird. It prey upon other birds.

pets Pets are animals that live with us.

pig Pigs are hoofed mammals that oink!

pigeon There are a lot of pigeons in cities.

piglet A piglet is a young pig.

pika Pikas are small, furry mammals who stockpile food for the winter.

pill bug The pill bug (also called the roly-poly bug) is a small isopod that curls into an armored ball when it is threatened.

piranha Piranhas are meat-eating, freshwater fish that are native to eastern South America.

plankton Plankton are tiny organisms that float in the seas and other bodies of water. Plankton is the base of the oceanic food web.

platypus The duck-billed platypus is a primitive, egg-laying mammal from Australia.

plesiosaur Plesiosaurs are extinct marine reptiles that lived during the time of the dinosaurs.

pod A group of whales is called a pod.

poison arrow frog Poison arrow frogs are poisonous frogs from rainforests of South and Central America. Some South American Indians apply the poison to the tips of their hunting arrows and blow-gun darts.

polar bear Polar bears are large meat-eaters live in the far north. They have clear-colored hair and black skin.

polliwog A polliwog is another name for a tadpole, a baby frog or toad.

Pomeranian The Pomeranian is a small, friendly, intelligent companion dog.

pond skater The pond skater is a bug that walks on water.

poodle The poodle is a lively, intelligent dog that was originally bred to retrieve game from the water.

porcupine Porcupines are mammals with protective, needle-like quills on their body.

porpoise A porpoise is a marine mammal with a long nose and teeth. They are also known as dolphins; they are a type of toothed whales.

Portuguese Water Dog The Portuguese water dog is an active, intelligent dog. It was originally bred to help fishermen.

prairie chicken The prairie chicken is a bird that lives in grasslands of North America.

prairie dog The prairie dog is a ground squirrel; it is not a dog.

praying mantid The praying mantid (also called the praying mantis) is a predatory insect that eats garden pests.

pronghorn Pronghorns are the fastest moving mammals in North America.

Protoceratops Protoceratops was a small, frilled, plant-eating dinosaur.

Pteranodon Pteranodon was a flying, prehistoric reptile (a pterosaur) with a large head crest and no teeth. It was related to the dinosaurs, but was not a dinosaur. Pteranodon means "winged and toothless."

Pterodactyl Pterodactyls were a group of flying, prehistoric reptiles with short tails (pterosaurs). They were related to the dinosaurs. Pterodactyl means "wing finger."

pterosaur Pterosaurs were flying, prehistoric reptiles. They were related to the dinosaurs. Pterosaur means "winged lizard." Pterosaurs ranged in size from a few inches long to over 40 feet long.

pufferfish Also called blowfish, this poisonous fish can swallow water to double its size.

puffin The puffin is an Arctic sea bird.

pug The Pug is a loyal, affectionate dog that has a squarely-built body and a flat, wrinkled face. It was originally bred in China.

puma A long-tailed wild cat with no spots. It is also known as the cougar, panther, mountain lion, and catamont.

pupa A pupa is the stage in a butterfly's life when it is changing from a a caterpillar into a butterfly. It is also called the chrysalis.

puppy A puppy is a young dog.

python A python is a large, constricting snake.

Quaesitosaurus Quaesitosaurus was plant-eating dinosaur with a long neck and a long tail.

quagga The quagga is a recently-extinct relative of the zebra.

quail A quail is a bird; it spends a lot of time on the ground.

Queen Alexandra's birdwing butterfly Queen Alexandra's Birdwing is the biggest butterfly in the world. Its wingspan is about 1 foot (30 cm) wide.

queen conch The queen conch is a large, shelled animal from warm seas. It is in danger of extinction.

quetzal The quetzal is a beautiful rain forest bird with very long tail feathers.

Quetzalcoatlus Quetzalcoatlus was a giant pterosaur and the largest flying animal ever. It went extinct millions of years ago.

quokka The Quokka is a plant-eating marsupial from Australia, a small wallaby (a type of kangaroo).

quoll The Quoll is a cat-sized carnivorous marsupial from the island of Tasmania and mainland Australia.

rabbit A rabbit is a small, cute mammal with big ears.

raccoon The raccoon is a mammal with mask-like markings on its face and a ringed tail.

rainbow lorikeet A small, colorful, brush-tongued parrot from Australia.

rat A rat is a rodent with a long tail and a pointed snout.

rattlesnake Rattlesnakes are poisonous snakes that have a rattle at the end of their tail.

ray A ray is a flat fish that is related to the sharks. Many have a long tail that stings.

red-eyed tree frog The red-eyed tree frog is a rain forest frog with bright red eyes.

red panda Red Pandas are bear-like mammals from mountains in Asia.

red wolf Red wolves are endangered meat-eaters from the eastern USA.

reindeer Reindeer live in the far north.

reptile Reptiles are a group of scaly, egg-laying animals. Lizards, snakes, turtles and dinosaurs are reptiles.

rhea The rhea is a large, flightless bird from South America.

rhinoceros A rhinoceros is a huge animal that has one or two horn-like spikes on its head. This mammal is also called a rhino.

right whale Right whales are baleen whales with a huge head and an arched mouth. They were almost hunted to extinction.

river otter River otters are aquatic mammals from North America that have a streamlined shape.

roach A roach is a type of insect. It has six legs and white blood.

roadrunner The roadrunner is a bird is a fast running bird that rarely flies.

robin The robin is a common bird with red-colored feathers on its breast.

rockhopper penguin The rockhopper penguin is a small, aggressive, crested bird that cannot fly.

rodent Rodents are mammals whose two front teeth continue to grow throughout their lives. Rats, mice, beavers, squirrels, hamsters, and gerbils are rodents.

Rottweiler The Rottweiler is a powerful, muscular, determined dog that was originally bred in Germany to guard and herd cattle.

saber-toothed cat The saber-toothed cats (also called saber-toothed tigers) were large meat eaters that lived during the last ice age.

sailfish The sailfish is a deep-sea fish. It is the fastest fish in the sea and can swim up to 68 miles per hour (110 kph).

Saint Bernard A large, muscular, heroic dog originally from Switzerland.

salamander Salamanders are amphibians that retain their tail as an adult.

salmon Salmon are fish that live in the sea and spawn in fresh water.

sand dollar Sand Dollars are coin-shaped spiny-skinned sea bed animals that have 5-part radial symmetry.

Saurornithoides Saurornithoides was a small, fast-moving, meat-eating dinosaur.

scales Scales are thin, hard, overlapping plates on some animals. Fish are covered with scales. Butterfly wings are made of scales.

scallop Scallops are animals that have two shells and live on the ocean floor.

scorpion The scorpion is a venomous arachnid with a large stinger on its tail. Scorpions are found on all the continents except Antarctica.

Scottish terrier The Scottish terrier (also known as the Scotty) is a small dog that was originally bred to hunt foxes and badgers.

sea anemone A sea snemone is a predatory sea animal that looks like a flower and lives on the ocean floor.

sea cow Sea cows (also called manatees) are gentle, slow-swimming, aquatic mammals.

sea cucumber Sea cucumbers are cylinder-shaped animals that live on the sea floor.

sea gull The sea gull is the common name for some birds that live near oceans and lakes.

sea horse The sea horse is a very strange type of fish - it has a long snout and a curled tail.

seal Seals are animals that live in the ocean but breathe air. They are marine mammals.

sea lion Sea lions are eared seals that live off the coast of western North America.

sea otter Sea otters are marine mammals with very dense, waterproof fur.

sea star Sea stars, another name for starfish, are animals that live on the ocean floor.

sea urchin The sea urchin is a spiny, globular animal that lives on the ocean floor.

Segisaurus Segisaurus was a fast-moving, goose-sized dinosaur.

Segnosaurus Segnosaurus was meat-eating dinosaur that lived in what is now Mongolia.

Seismosaurus Seismosaurus was a long-necked, plant-eating dinosaur that was over 130 feet long. Its name means "earthquake lizard."

serpent A serpent is a reptile with scaly skin and no legs or arms.

serval The serval is a long-legged African wild cat.

shark Sharks are meat-eaters that have no bones, only cartilage (which is softer than bone) in their skeleton.

sheep Sheep are farm animals that are raised for wool and meat.

sheepdog, old English The old English sheepdog is an affectionate, long-haired dog that was originally bred in Great Britain.

shell Some animals grow a shell for protection.

shrew Shrews are the tiniest mammals. They are ferocious meat-eaters.

shrimp Shrimp are small animals that live in the water.

siamang The siamang is a rare, black, long-armed ape from rainforests in southeast Asia.

silkworm The silkworm moth is an insect (not a worm) that produces a silken cocoon. This cocoon is harvested to make silk thread.

skink A skink is a type of lizard that has a long body and short legs.

skunk Skunks are mammals that can produce a terrible smell.

sloth The sloth is a slow-moving, nocturnal, rainforest mammal that lives hanging upside-down from trees.

slow worm The slow worm is a legless lizard that looks like a snake (it is not a worm at all).

slug The slug is an animal that lives in moist areas.

Smilodon Smilodon was the largest saber-toothed cat. It was a meat eater that lived during the last Ice Age.

snail A snail is a small, slow animal with its own shell.

snake A snake is a reptile with a long, narrow body and no legs. It has skin with scales.

snow goose The snow goose is a migratory bird from North America.

snowy owl The snowy owl is a white owl that lives in the North American tundra (a cold, snowy environment).

sparrow The sparrow is a small, common songbird.

spectacled bear The spectacled bear is the only South American bear. It has markings around its eyes that look like glasses.

spider A spider is an arachnid (and not an insect). It has eight jointed legs, a two-part body, and an exoskeleton.

spiderling A spiderling is a young spider. Spiderlings hatch from eggs.

Spinosaurus Spinosaurus was a sail-backed, meat-eating dinosaur.

sponge A sponge is a primitive animal that lives in the water.

spotted owl The spotted owl is an owl from the Pacific coast of North America.

spyhopping Spyhopping is when a whale pokes its head up out of the water and turns around, perhaps to look around.

squid Squids swim in the oceans. They have ten arms and an ink sac.

squirrel Squirrels are rodents.

starfish Starfish (also known as sea stars) are animals that live on the ocean floor.

St. Bernard A large, muscular, heroic dog originally from Switzerland.

Stegosaurus Stegosaurus was a plant-eating dinosaur that had armored plates along its back.

stick insect The stick insect (also called the walkingstick) is a long, slow-moving, plant-eating insect that looks like a twig.

stingray A stingray is a flat fish with cartilage instead of bones. Its sting is in its tail.

Styracosaurus Styracosaurus was a plant-eating dinosaur that had a big nose horn and a horned frill.

sugar glider This small marsupial (also known as the lesser flying phalanger) glides from tree to tree in Australia and nearby islands.

sun bear The sun bear is the smallest bear. It lives in Asia and is quite ferocious. This mammal is also known as the honey bear and the Malay bear.

sunfish The sunfish is a large fish with an almost circular, flattened body.

Supersaurus Supersaurus was a long-necked, plant-eating dinosaur that was about 100 feet long. Its name means "super lizard."

swan Swans are long-necked water birds.

swarm A swarm is a group of flying insects, like bees.

swordfish The swordfish is a large fish with a long, sharp bill.

Syntarsus Syntarsus was a fast-moving, meat-eating dinosaur that lived during the Jurassic period.

tadpole Tadpoles are baby frogs or toads.

tail Some animals have a tail.

tapir A tapir is a plant-eating, hoofed mammal with a small trunk.

tarantula A tarantula is a large, hairy spider.

tarsier Tarsiers are small mammals with enormous eyes.

Tasmanian devil Tasmanian devils are nocturnal (most active at night), meat-eating marsupials from Tasmania, an island off mainland Australia.

Tasmanian tiger The Tasmanian tiger was a large, meat-eating marsupial from Tasmania, mainland Australia, and New Guinea. It is probably extinct.

tern Terns are birds that are sometimes called "sea swallows."

terrier Terriers are dogs that were originally bred to drive small animals from their burrows.

Thescelosaurus Thescelosaurus was a plant-eating dinosaur whose four-chambered, fossilized heart has been found.

three-toed sloth The sloth is a slow-moving mammal that lives hanging upside-down from trees.

thresher shark The thresher shark has a a greatly-elongated top part of the tail.

tiger Tigers are large, fierce cats that have stripes.

tiger shark Tiger sharks are large, fierce sharks that have faint stripes.

tiger swallowtail butterfly The tiger swallowtail is a butterfly with black and yellow markings, and elongated tails on its hind wings.

toad Toads are amphibians with poison glands and usually warty skin.

Torosaurus Torosaurus was a large, plant-eating dinosaur with three horns, a huge, bony frill, and a huge skull.

toucan The toucan is a rainforest bird that has a big, colorful beak.

Trachodon Trachodon was a duck-billed, plant-eating dinosaur. It is known only from its fossilized teeth.

T. rex T. rex is short for Tyrannosaurus rex. Tyrannosaurus rex was a huge, meat-eating dinosaur that had short arms and two-fingered hands.

Triceratops Triceratops was a large, plant-eating dinosaur that had three horns on its head.

trilobite Trilobites are extinct, hard-shelled marine animals that lived in the seas millions of years ago.

trout The trout is a torpedo-shaped fish that lives in lakes and streams.

trunk An elephant's trunk is its long nose.

tuatara The tuatara is an unusual reptile from islands off New Zealand.

tuna The tuna is a very large, bony fish that lives in the ocean. People eat a lot of tuna.

turkey Turkeys are large birds that nest on the ground.

turtle Turtles are slow animals that have a very hard shell.

Tyrannosaurus rex Tyrannosaurus rex was a huge, meat-eating dinosaur that had had short arms and two-fingered hands. It is also called T. rex.

Ultrasauros Ultrasauros was a huge, long-necked dinosaur.

Ulysses butterfly The Ulysses butterfly is a spectacular swallowtail butterfly found in Australian rainforests.

umbrellabird The Umbrellabird is a rain forest bird with a large tuft of feathers on its head.

Unenlagia Unenlagia was a bird-like dinosaur.

ungulate Ungulates are hoofed mammals.

urchin, sea The sea urchin is a spiny, globular animal that lives on the ocean floor.

Utahraptor Utahraptor was a fierce, meat-eating dinosaur.

vampire bat The vampire bat is the only bat that drinks blood.

Velociraptor Velociraptor was a very fast, small, meat-eating dinosaur.

veterinarian A veterinarian is a doctor who helps animals.

viceroy The viceroy butterfly is a brown and orange, non-poisonous butterfly that is very similar to the monarch butterfly. It can be distinguished from the monarch by the black line that crosses its wings.

vinegarroon The vinegarroon is a type of whip scorpion, an arachnid that emits a vinegar-like mist.

viper A viper is a poisonous snake.

Vulcanodon Vulcanodon was a long-necked plant-eating dinosaur.

vulture The vulture is a big, bald-headed bird that eats dead animals.

walkingstick The walkingstick (also called the stick insect) is a long, slow-moving, plant-eating insect that looks like a twig.

wallaby Wallabies are small to medium-sized marsupials that are similar to kangaroos.

walrus A walrus is a northern marine mammal with ivory tusks.

warthog The warthog is a wild pig from Africa.

wasp A wasp is a flying, stinging insect.

water strider The water strider is a bug that walks on water.

weasel Weasels are small, furry mammals with short legs.

Weddell seal The Weddell seal is a large, nocturnal marine mammal from Antarctica (near the South Pole).

whale Whales are large marine mammals. Whales breathe air using lungs.

whale shark The whale shark is the biggest shark and the biggest fish, but it eats tiny food that it sieves through its gills. It is not a whale; it is a shark.

whelk Whelks are ocean animals with a hard, spiral shell.

whippet The whippet is a confident, fast-running dog that was originally bred in Great Britain.

wild cat The African wild cat is a fierce cat and a fast hunters.

wildebeest The wildebeest is a fast-running grass-eater from Africa. It is also known as the gnu.

wolf The wolf is a furry, meat-eating mammal.

wolverine The wolverine is a ferocious type of weasel that lives in cold areas.

wombat The wombat is a large, burrowing marsupial from the islands of Australia and Tasmania. It is most active at night.

woodchuck The woodchuck is a rodent that is also called the groundhog.

wood louse The wood louse (also called the pill bug) is a small isopod that curls into an armored ball when it is threatened.

woodpecker The woodpecker is a bird that can peck holes in trees.

woolly bear caterpillar Woolly bear caterpillars grow up to be tiger moths.

woolly mammoth The woolly mammoth was a large elephant-like animal that lived during the ice ages.

woolly rhinoceros The Woolly Rhino is an extinct rhinoceros from the Ice Ages. This plant-eater had two "horns" on its head.

worm A worm is a little animal with a long, soft body. Worms don't have legs.

xenops Xenops is a rainforest bird from the Americas.

Xiaosaurus (pronounced sheow-SAWR-us) Xiaosaurus was a small, plant-eating dinosaur that lived during the Jurassic period. Xiaosaurus fossils were found in China.

Xiphias Xiphias is the group (genus) of swordfish, fast-swimming fish that have a long, sharp bill.

yak Yaks are large, strong, plant-eating mammals.

yellow jacket A yellow jacket is a type of wasp, a flying, stinging insect.

Yorkshire terrier The Yorkshire terrier is a small, intelligent, long-haired dog.

zebra Zebras have black and white stripes.

zebrafish Zebrafish are striped tropical fish.

zebra longwing butterfly The Zebra Longwing is a small, black-and-yellow striped butterfly from warm areas.

zebra swallowtail butterfly The Zebra Swallowtail is a butterfly with black and white markings and elongated tails on its hind wings.

zodiac moth The zodiac moth is a rainforest moth that lives in Australia.

zoo There are lots of animals at a zoo.

zoologist A zoologist is a scientist who studies animals.

zooplankton Zooplankton are tiny animals that float in the seas and other bodies of water.

zorilla The zorilla is a skunk-like mammal that lives in Africa.

zorro The zorro is a dog-like fox from South America.

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