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Believe it or not, the glands that produce milk are mutated sweat glands. In the monotremes, or egg-laying mammals (platypus and echidna), milk oozes out over a wide patch of skin (the mother platypus flexes her belly muscles to make a sort of trough to catch it). In more advanced mammals, it's excreted at specific sites, called teats.
Believe it or not, the glands that produce milk are mutated sweat glands. In the most primitive mammals (platypus and echidna), milk oozes out over a wide patch of skin (the mother platypus flexes her belly muscles to make a sort of trough to catch it). In more advanced mammals, it's excreted at specific sites, called teats.

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13y ago

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