One day Bird said, "Now it is time to build nests. Please help me make a nest."

过了一段时间，有一天，鸟建议道：“现在到了该筑巢的时候了，请你帮助我一起来筑巢吧。”

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I make a nest of leaves to hibernate in when it gets cold. And even though it might be wintertime, I sometimes wake up to look for more food.

当天气变冷，我用叶子做成窝住在里面。即便是冬天，有时我也会醒来去寻找更多的食物。

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Jan Procter, a teacher, said: "We have a little outcrop in our playground and the seagull has spotted this and decided to make a nest and has laid two eggs."

教师简•普克特说：“我们学校操场上有一块突出的地儿，海鸥发现后就把巢筑在这里，它已经在这儿产了两个卵了。”

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Moreover, Mr. Scott adds, it is easier to plan to make a retirement nest egg last until these payments begin than it is to figure out how to stretch it over an uncertain lifetime.

WSJ: Should You Buy 'Longevity' Insurance?

Savings of as little as 0.5% a year of assets could make a big impact on workers' nest eggs.

WSJ: 401(k) Plans Step Into the Sunshine

When you destroy their nest and make them migrate to a new one, they manage it very efficiently, as you would expect.

BBC: NEWS | Science/Nature | Ants - learning from the collective