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Mammals are characterized by the following features:
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Mammals breathe air with lungs. |
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Mammals are "warm-blooded": they maintain a constant, high body temperature independent of their surroundings. |
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As a rule, mammals bear live young.
(Two primitive mammals are exceptions to this rule: the duckbilled
platypus and the spiny anteater both lay eggs.) |
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Mammals nurse their young with milk. |
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Mammals have hair, at least at some
stage in their development. Many baleen whales have sparse hairs on the
snout, jaws, and chin. |
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