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Monotremes are mammals that lay eggs rather than giving birth. Examples of monotremes are the platypus and the echidna.

The literal definition of "monotreme" is "one holed". The name monotreme is derived from two Greek words meaning one-holed, because they have just one external opening, the cloaca, for both waste elimination and for reproduction. The cloaca leads to the urinary, faecal and reproductive tracks, all of which join internally, and it is the orifice by which the female monotreme lays her eggs.

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13y ago

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