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Of all the thousands of species of mammals, only three lay eggs. The two species of echidna and the platypus are the only egg-laying mammals (monotremes).

Echidnas lay their egg directly into a pouch (really just a flap of skin) which they develop only during breeding season.

Platypuses lay their eggs in a chamber at the end of a burrow dug into the side of a riverbank or creekbank.

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15y ago

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