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There are three species of mammals that lay eggs: the Platypus and two species of echidna, the long-beaked echidna of New Guinea and the short-beaked echidna of Australia.

The platypus tends to lay 1 to 3 eggs each breeding season, whereas the echidna lays a single egg into a rudimentary pouch that it develops during the breeding season.

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14y ago

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