They found the space in the cage too small to stay in.

他们发现笼子的空间太小，无法待在里面。

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The bird fluttered its wings in the cage.

鸟在笼子里扇翅膀。

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He noticed that as they fluttered around in the cage, they often launched themselves in the direction of their normal migratory route.

他注意到，当它们在笼子里到处飞的时候，通常会朝着常规的迁徙路线的方向。

youdao

The experiment was, he would put--the pigeon was in a cage and he'd let the pigeon get pretty hungry -hungry pigeons are not happy pigeons.

实验过程是,他把鸽子困在笼子里,还不给鸽子喂食,饥饿的鸽子怒火中烧

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