As the birds gain more experience building nests, they drop grass less often, suggesting that they improve at their art.

由于鸟在筑巢过程中取得了更多的经验，经常只会掉下很少的草，表明它们正在不断地改善作巢技巧。

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The rooks have already courted with their mates, and are building nests in ash, elm and sycamore - a sign that never fails.

赌棍和他们的助手已经追求了，而且正在建造灰，榆木和大枫树的巢套-一个永不失败的标志。

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You cannot prevent the birds of sorrow from flying over your head, but you can prevent them from building nests in your hair.

你无法阻止鸟儿在你的头顶飞翔，但你可以阻止它们在你的头发上做窝。

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Joseph Garner, of Stanford University, thinks the answer is to keep the labs cool, but let mice cope with the low temperatures as they do in their natural habitat: not by eating more but by building nests.

ECONOMIST: ��and they may return the favour