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Monotremes are remarkable mammals that lay eggs, have electrosensitive bills (Platypus) or beaks (echidnas), have spurs associated with a venom system, and feed their young on milk.

While they show regular mammalian features that include body hair and the ability to maintain a constant body temperature, they have no nipples and the milk they produce must be lapped up by their young as it is secreted from ducts on the mother’s belly.

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