Birds feed on worms. A bird will go hungry if it cannot catch worms. The bird that gets up early is sure to get some food, so the early bird catches the worm.

鸟以虫为食。鸟捉不到虫就会饿。早起的鸟儿定能得到食物，因此早起的鸟儿有虫吃。

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I bought a bag of bird feed.

我买了一袋鸟食。

《新英汉大辞典》

As birders observe new species, they not only learn about different birds, but they also learn about migration, bird behavior, feed preferences, courtship and bird territories.

观鸟者观察各种新的物种，从中他们不止能认识不同的鸟种，还能学到关于迁徙、鸟类行为学、食性、求爱还有鸟类领地的知识。

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