The spiny anteater, more correctly known as the echidna, and the platypus are both monotremes. Monotremes are egg-laying mammals.
There are several reasons why platypuses and echidnas are classified as mammals.
1. Platypuses and echidnas have fur (all mammals have fur, skin or hair).
2. They breathe using lungs (not gills).
3. They are warm blooded.
4. The main reason is that they suckle their young on mothers' milk.
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