EPISODE · Sep 16, 2025 · 17 MIN
290. 啮齿动物的秘密武器：拇指甲
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《Popular Science》上的一篇文章探讨了啮齿动物的进化成功，重点关注了它们拇指上的指甲。这篇文章解释了这些被称为“缩略指甲”的平坦指甲，而非尖锐的爪子，如何帮助松鼠、老鼠等啮齿动物更灵活地操作和食用食物，特别是坚果。研究人员通过检查博物馆藏品和分析不同啮齿动物物种的手部结构和饮食习惯，发现拥有缩略指甲的祖先在大约6000万年前促进了啮齿动物的多样化。这项研究强调了博物馆藏品的重要性，并指出这些不起眼的指甲可能是啮齿动物在地球上广泛分布的关键因素。内容来源：https://www.popsci.com/environment/squirrel-thumbnails/
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290. 啮齿动物的秘密武器：拇指甲
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