Echidnas are part of a very rare group of egg-laying mammals called monotremes.
There are only 5 monotremes on Earth: four species of echidnas, plus platypuses.
Science fact of the day: Echidnas are egg-laying mammals
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Echidnas are part of a very rare group of egg-laying mammals called monotremes.
There are only 5 monotremes on Earth: four species of echidnas, plus platypuses.
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