Hatchlings didn't leave the nest site immediately, but stayed in the area until they were at least double their hatching size.

幼仔不会立刻离开巢穴，而是一直在该区待到至少是孵化时两倍大小才离开。

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Within a few days of hatching, cygnets venture from the nest to forage for aquatic plants and insects.

刚刚孵化几天的小天鹅冒险走出巢穴，寻找可吃的水草和昆虫。

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The bird is monogamous, the female answers for nest building, hatching and brooding, the male answers for guarding home range and alerting.

该鸟为一夫一妻制，雌鸟担任筑巢、孵卵、育雏任务，雄鸟主要担任保卫领域及警戒任务。

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First, she showed that having extra eggs in a nest does indeed reduce hatching success.

ECONOMIST: Birds do it, bees do it | The