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No. Echidnas and platypuses are Mammals, not reptiles. They are unique egg-laying mammals known as moniemes. 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.
5. They have a flexible neck with seven cervical vertebrae.
6. Platypuses and echidnas show enhanced neocortex development.
7. Sound is produced by the larynx (a modified region of the trachea).
8. Limbs are oriented vertically
9. Like all mammals, they have a heart with 4 chambers.
10. Internal temperature is generally high.
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