Animals

Animals

Scientists have grouped animals into classes to make it easier to study them. There are many different animal classes and every animal in the world belongs to one of them. The five classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians.

Animals

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Mammals

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A mammal is an animal that breathes air, has a backbone, and grows hair at some point during its life. In addition, all female mammals have glands that can produce milk. Mammals are among the most intelligent of all living creatures. Mammals include a wide variety of animals, from cats to humans to whales.

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fun fact

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The biggest animal on earth is a mammal - the 30m long BLUE WHALE.

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Mammals

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Birds

Birds are a class of vertebrates, the Aves. They are warm-blooded and lay eggs. Their bodies are covered with feathers and they have wings. Feathers have three functions: flight, temperature regulation and display. Most birds have hollow main bones with air sacs in them. This makes them lighter and makes flight easier.

hollow bones

Birds

FIsh

A fish is an animal that lives in water and has fins for swimming and gills for breathing. Fish are cold-blooded animals with skeletons inside their bodies. Most fish have scales on their skin. There are many kinds of fish, including salmon, goldfish, tuna, and sharks.

Learn how to draw a Koi fish

FIsh

reptiles

A reptile is an air-breathing animal that has scales instead of hair or feathers. Reptiles have lived on Earth for more than 280 million years. Over the years many kinds of reptiles have become extinct, or died out. The dinosaurs are well-known reptiles that became extinct about 65 million years ago.. Today there are about 6,000 species, or types, of living reptiles. They include snakes, lizards, turtles, alligators, and crocodiles.