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By definition, mammals have live young, with the exception of the three species of monotremes.

These include the platypus and the short-beaked echidna, native to Australia, and the long-beaked echidna, native to New Guinea (there are three sub-species of the long-beaked echidna). These animals lay eggs, but still feed their young on mother's milk.

Eutheria (placental mammals) and marsupials do not lay eggs.

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8y ago

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