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Platypuses and echidnas are both 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 montreme lays her eggs.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoMonotremes have hair; reptiles do not.
Female monotremes produce milk; female reptiles do not.
Monotremes have a single lower jaw bone; reptiles have three lower jaw bones.
monotremes are warm blooded where as reptiles cold blooded.
Wiki User
∙ 12y agoMonotremes are mammals, even though they lay eggs. Unlike reptiles they are warm-blooded, have hair, and nurse their young after they hatch.
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