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Tuesday, 12 April 2016
鸟儿长着牙齿吗?
距离观察你会发现,它们上下喙的外部边缘是锯齿状的,这样的构造能让鸟轻松地咬断嫩枝和青草。不过,这可不是真正意义上的牙齿,科学家们称之为齿状喙。
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