《太平广记·卷四百六十三·禽鸟四》
石首鱼，到秋天就变成冠凫鸟，冠凫鸟的头里面有石头。
石首鱼，至秋化为冠凫，冠凫头中有石也。
Yellow croakers become crested ducks in autumn, and the head of a crested duck contains a stone.
<s>[INST] For each of the following sets of Classical Chinese and Modern Chinese sentences, provide an English translation that captures the essence of both: Classical: 石首鱼，至秋化为冠凫，冠凫头中有石也。 Modern: 石首鱼，到秋天就变成冠凫鸟，冠凫鸟的头里面有石头。 [/INST] Yellow croakers become crested ducks in autumn, and the head of a crested duck contains a stone.</s>
For each of the following sets of Classical Chinese and Modern Chinese sentences, provide an English translation that captures the essence of both: Classical: 石首鱼，至秋化为冠凫，冠凫头中有石也。 Modern: 石首鱼，到秋天就变成冠凫鸟，冠凫鸟的头里面有石头。
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Yellow croakers become crested ducks in autumn, and the head of a crested duck contains a stone.
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