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A platypus is a mammal. Like other mammals, it feeds its young on mother's milk. It just so happens that it is a mammal which lays eggs. Therefore, it is a monotreme.

Both platypuses and echidnas are monotremes. 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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16y ago

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