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Monotremes are egg-laying mammals. The only monotremes in the world are the echidna and the platypus, both native only to Australia and New Guinea. There is one species of platypus, and two species of echidna: the short-beaked echidna of Australia and the long-beaked echidna of New Guinea. There are three sub-species of long-beaked echidna.

Monotreme means "one opening" as they have only one opening for faeces, urine and the laying of eggs. They are also the only mammals to lay eggs.

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8y ago

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