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This group includes platypuses and echidnas. Monotremes are unique among mammals because they lay eggs rather than giving birth to live young.
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While marsupial young (joeys) do initially rely on their mother's milk, the milk they consume changes in composition as they grow.
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These subterranean rodents have a unique social structure where the queen produces milk for the colony.
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Although not mammals, it’s worth noting that many birds and reptiles do not drink milk.
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