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Is a platypus a mammal or reptile?

Best Answers

They're mammals, but not placental or marsupial mammals like most we're familiar with. There are two competing theories about exactly how the three extant mammalian orders relate to each other. read more

The Platypus is a MAMMAL,more precisely an egg-laying (oviparous) mammal which is a species of Monotremes (although some people wrongly believe it to be a hybrid of an otter,a beaver and a duck!). read more

However, platypuses (as well as echidnas, the only other monotreme still around) are still very much mammals. The “missing link” between reptiles and mammals was around before the dinosaurs were and probably looked a lot more like a reptile than a mammal. If you’re interested in missing links between reptiles and mammals look up synapsids. read more

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