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members of the subclass Prototheria of the class Mammalia; the egg-laying mammals.
Egg-laying mammals. The only living monotremes are the platypus and the echidna.
the egg-laying mammals that produce milk.
Egg-laying mammals; e.g., the spiny anteater and the duck-billed platypus.
egg-laying mammals with reptilian features, comprising the Platypus and Echidna
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