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The platypus (Ornithorhynchus anatinus) is one of only two mammals — the other is the echidna (spiny anteater) — that lays eggs. 鸭嘴兽(Ornithorhynchus anatinus)是仅有的两种卵生的哺乳动物之一，另一种为食蚁兽（spiny anteater）。