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The platypus is considered to be a primitive mammal which still has some reptilian characteristics, but it does have fur, and it does secrete milk to feed its offspring, and those are key mammalian characteristics that no reptile has.

Correction:

In recent decades, scientists have debunked the theory that platypuses and their egg-laying relatives, echidnas, are primitive. Egg-laying mammals are called monotremes, and it is no longer believed that monotremes are primitive mammals.

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13y ago

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