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Hedgehogs give with birth to live young and echidas lay eggs. Echidas are not related to hedgehogs. Usually, echidas are compared to (but not closely related to) porcupines and anteaters. Echidas are close cousins to the platypus, the only other egg laying mammal. Both the echidas and the platypus (they are called monotremes) are found only in Australia. Monotremes have milk ducts (pores) that allow them to feed their young. Monotremes do not have nipples like other mammals.

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16y ago

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