Animals are living things that can move, eat, and grow. Animals live all around the world—on land, in water, and in the air. Animal vocabulary is useful when talking about nature, daily life, and the world around us.
Animal Names | Classification of Animals
Animals are a diverse group of living organisms that inhabit the earth. The animal kingdom is divided into several groups based on shared characteristics.
Vertebrates
There are five main types of vertebrates: mammals, birds, reptiles, amphibians, and fish. Each group has features that help them survive in different environments.
Mammals
Mammals have hair or fur, are warm-blooded, and produce milk to feed their young. They live in many places, from forests and grasslands to oceans and deserts.
Example: A dolphin is a mammal. It breathes air.
Marsupials
Marsupials are mammals that carry their babies in a pouch. Many marsupials live in Australia, such as kangaroos and koalas. Some also live in the Americas, such as opossums.
Example: A kangaroo carries its baby in a pouch.
Birds
Birds have feathers, wings, and beaks. They are warm-blooded and lay eggs.
Example: An eagle has wings and can fly.
Reptiles
Reptiles have dry, scaly skin and lay eggs. They are cold-blooded, so their body temperature changes with the environment.
Example: A crocodile is a reptile. It has scaly skin.
Amphibians
Amphibians have moist, smooth skin and lay eggs in water. Many amphibians start life in water and later live on land.
Example: A frog can live in water and on land.
Fish
Fish live in water and breathe through gills. They are cold-blooded and usually have fins to help them swim.
Example: A shark is a fish. It swims using fins.
Invertebrates
Invertebrates do not have a backbone. There are many kinds of invertebrates, and they make up most animal species on Earth.
Arthropods
Arthropods have an exoskeleton (a hard outer body) and jointed legs. Major groups include insects, arachnids, crustaceans, and myriapods.
Insects
Insects have three body parts and six legs. Many insects also have wings.
Example: A butterfly is an insect with wings.
Crustaceans
Crustaceans include crabs, lobsters, shrimp, and barnacles. Many live in water.
Example: A crab is a crustacean with a hard shell.
Arachnids include spiders, scorpions, ticks, and mites. They have two main body parts and eight legs.
Example: A spider is an arachnid with eight legs.
Myriapods
Myriapods include centipedes and millipedes. They have long bodies and many legs.
Example: A centipede has many legs.
Echinoderms
Echinoderms live in the ocean. Common echinoderms include sea stars, sea urchins, and sea cucumbers.
- Brittle star
- Crinoid
- Sand dollar
- Sea cucumber
- Sea lily
- Sea urchin
- Starfish (sea star)
Mollusks
Mollusks have soft bodies. Some have shells, such as clams and snails, and some do not, such as octopuses and squid.
- Abalone
- Ark clam
- Basket clam
- Chiton
- Clam
- Cuttlefish
- Mussel
- Octopus
- Oyster
- Scallop
- Slug
- Snail
- Squid
- Sweet snail
- Tusk shell
Annelids
Annelids are segmented worms. Common examples include earthworms and leeches.
Example: Earthworms help keep the soil healthy.
- Earthworm
- Leech
- Polychaete worm
Cnidarians
Cnidarians include animals with stinging cells, such as jellyfish and corals.
Example: A jellyfish has a soft body and can sting.
- Jellyfish
- Coral
- Sea anemone
- Hydra
Animal Habitats
Animals can live in many habitats, such as forests, deserts, oceans, and tundras.
Forest Animals
Forests can be temperate or tropical. Many forest animals live in trees or use forests for shelter.
Core examples: Squirrel, Jaguar
Example:
- A squirrel hides nuts in the ground.
- The jaguar is a powerful cat from the rainforest.
Aquatic Animals
Aquatic animals live in water. Some live in the ocean (saltwater), and some live in rivers and lakes (freshwater).
Marine Animals (Saltwater)
Marine animals live in oceans and seas. A simple way to group them is fish, sharks, and marine mammals.
- Fish: Fish live in the sea and breathe through gills.
- Sharks: Sharks are fish with powerful jaws and sharp teeth.
- Marine mammals: Whales and dolphins are mammals. They breathe air and feed milk to their babies.
Example: A whale is a marine mammal. It breathes air.
Freshwater Animals
Freshwater animals live in rivers, lakes, and ponds.
- Frog
- Turtle
- Fish (trout, bass, catfish)
Example: A turtle can live in a lake.
Desert Animals
Deserts are dry and hot in the day, and many desert animals are active at night. Some of the animals that can be found in deserts include snakes, lizards, camels, and coyotes.
Note: A camel is also a mammal.
- Armadillo
- Bighorn sheep
- Black widow spider
- Camel
- Centipede
- Coati
- Cobra
- Coral snake
- Coyote
- Eagle
- Fennec fox
- Gecko
- Gila monster
- Iguana
- Jackrabbit
- Kangaroo rat
- Llama
- Long-nosed bat
- Meerkat
- Ostrich
- Rattlesnake
- Scorpion
- Tortoise
- Vulture
- Xerus
Grassland Animals
Grasslands are open spaces with few trees. Many grassland animals live in herds for protection.
Core examples: Cheetah, Prairie dog
Example:
- The cheetah is the fastest land animal.
- Prairie dogs live in underground burrows.
Farm Animals
Farm animals are domesticated animals raised on farms for food and products.
- Cow ★ – Cows provide milk for us to drink.
- Chicken ★ – Chickens lay eggs every morning.
- Sheep ★ – We use sheep’s wool to make warm clothes.
- Pig – Pigs are very intelligent farm animals.
Mountain Animals
Mountain animals live in high places with cold weather and thin air.
Core examples: Snow leopard, Mountain goat
Example:
- Snow leopards have thick fur to stay warm in the mountains.
- A mountain goat is an excellent climber.
Rainforest Animals
Rainforests are home to many species. One famous rainforest animal is the jaguar.
Tundra Animals
Tundra animals live in very cold regions and have thick fur or feathers.
- Arctic fox
- Caribou
- Polar bear
- Musk ox
- Arctic hare
- Snowy owl
- Lemming
- Arctic wolf
- Snow goose
- Ermine
Wild Animals
Wild animals live in nature and are not domesticated.
Zoo Animals
Zoo animals are animals people may see in zoos, such as big cats, monkeys, and reptiles.
Endangered Animals
The world is home to many animal species, but some are at risk of extinction. These are called endangered animals. Here are some endangered animals:
- African elephant
- Amur leopard
- Black rhino
- Bornean orangutan
- Cross River gorilla
- Hawksbill turtle
- Javan rhino
- Leatherback turtle
- Mountain gorilla
- Saola
- Sea otter
- Siberian tiger
- Sumatran elephant
- Sumatran orangutan
- Vaquita
- Western lowland gorilla
- Yangtze finless porpoise
- Blue whale ★ – The largest animal ever to live on Earth.
- Giant panda ★ – A symbol of wildlife conservation.
- Snow leopard – Often called the “Ghost of the Mountains.”
Last Updated on February 10, 2026
