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Platypuses are easy to classify. They are mammals. Platypuses are mammals because, like all mammals, they feed their young on mothers' milk. The defining trait of a mammal is to have mammary glands, to produce milk for its young. The platypus produces its milk from numerous glands over its underside, unlike other mammals which have teats.

There are other reasons why platypuses are classified as mammals, such as having skin, hair or fur, being warm blooded and breathing via lungs (not gills).

It just happens that platypuses, like echidnas, are egg-laying mammals, or monotremes. But they are still mammals.

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13y ago

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