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The platypus (Ornithorhynchus anatinus) is one of only two mammals — the other is the echidna (spiny anteater) — that lays eggs. 鴨嘴獸(Ornithorhynchus anatinus)是僅有的兩種卵生的哺乳動物之一，另一種爲食蟻獸（spiny anteater）。