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Mammalia

By Laura Klappenbach, About.com

Definition:

n. Mammals, as a group of animals, belong to the Class Mammalia. The Class Mammalia, in turn, belongs to the larger group known as the vertebrates (animals with backbones; also called the Phylum Chordata). Mammals are endothermic, have hair, have specialized teeth, and whose young are nursed from mammary glands.

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