每当白嘴鸦丢下一根香烟或一小块垃圾的时候，人们就会用一个装了鸟食的小盒子来鼓励鸟儿们打扫公园。

The birds will be encouraged to clean the park through the use of a small box that delivers a small amount of bird food each time the rook deposits a cigaret and/or a small piece of rubbish.

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黑鸢离去后，分别来了三只白颈鸦、喜鹊与八哥。

When Kites gone, three Collared Crows, Magpie and Crested Myna occupied the tree.

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现在，科学家报道说乌鸦亲戚白嘴鸦能用同样的扔石技巧来够到浮动的蠕虫。

Now, scientists report that some relatives of crows called rooks used the same stone-dropping strategy to get at a floating worm.

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现在，科学家报道说乌鸦亲戚白嘴鸦能用同样的扔石技巧来够到浮动的蠕虫。

Now, scientists report that some relatives of crows called rooks used the same stone-dropping strategy to get at a floating worm.

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