在冬天，你可以观察洞穴，里面会有许多鸟儿筑巢。

There is an opportunity to inspect a cave and scare numerous birds nesting there even in winter.

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特别在地震前，动物也会受到影响，蛇被观察到从冬眠中醒来，老鼠从洞穴中逃走，狗会狂吠，猫会莫名其妙地跳来跳去。

Animals are also affected, particularly before earthquakes, snakes have been observed to come out of hibernation, rats to flee from their burrows, dogs howl and cats jump about unaccountably.

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这个数据可以回溯到对洞穴绘画的研究，人们观察猎人们用哪只手拿武器，以及考古学上对文物的分析。

And this goes back to studies of cave paintings, looking at which hands hunters are using to hold their spears, and to archaeological analyses of ancient artifacts.

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