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Monotremes include platypuses and echidnas. Of these, the platypus does not have a pouch of any type.

Female echidnas (and, occasionally, the males as well) develop a rudimentary pouch each breeding season. The pouch is really just a flap of skin into which the female echidna lays and incubates the egg. As soon as the young echidna begins to develop its spines, it is transferred into a burrow.

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14y ago

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