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There are six main classes of animals in this world: mammals, birds, fishes, reptiles, amphibians,and invertebrates.

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Animal Class Description (Which Class do you like most?) Details


Dogs, cats, horses, duckbill platypuses, kangaroos, dolphins and whales are all mammals. What do all these animals have in common? All of these animals drink milk when they are a baby and have hair on their body.
Class: Mammalia
Orders: 26
Families: 137
Genera: 1142
Species: 4785
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All birds have feathers and are born out of hard-shelled eggs. The feathers on a bird?s wings and tail overlap. Because they overlap, the feathers catch and hold the air. This helps the bird to fly, steer itself, and land.
Phylum: Chordata
Class: Aves
Orders: 29
Families: 194
Genera: 2161
Species: 9721
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Fish are vertebrates (animals with a backbone) that live in water and have gills, scales and fins on their body.
Phylum: Chordata
Orders: 62
Families: 504
Species: 25777
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Reptiles are a class of animal with scaly skin. They are cold blooded and are born on land.
Phylum: Chordata
Class: Reptilia
Orders: 4
Families: 60
Genera: 1012
Species: 8163
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Amphibians are born in the water. When they are born, they breath with gills like a fish. But when they grow up, they develop lungs and can live on land.
Phylum: Chordata
Class: Amphibia
Orders: 3
Families: 44
Genera: 434
Species: 5400
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Over 95 percent of all animals are invertebrates. They are characterized by a structure they all lack: A backbone or vertebal column.
Orders: 370
Species: 1300000
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