Which mammalian lineage has two species of spiny anteaters (echidnas) and the duck-billed platypus as the only known living members?

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Monotremata is the only mammalian lineage that has two species of spiny anteaters (echidnas) and the duck-billed platypus as the only known living members. This group of mammals is unique in that they lay eggs instead of giving birth to live young, making them different from all other mammals.

Which Mammalian Lineage Has Two Species of Spiny Anteaters (Echidnas)