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Mammals:

Are Warm-blooded (i.e. with an internal heat source and regulation),

Are Viviparous - the Duck-billed Platypus and one or two other animals are warm-blooded but lay eggs, and strictly speaking belong to their own group, the monotremes, not mammals.

Lactate - to feed their own young directly.

Have hair, to greater or lesser extent depending on species and (in our species at least) sex.

The birds are warm-blooded but are all oviparous, do not lactate and have feathers not hair - and are closer to reptiles than to mammals.

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7y ago

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