To avoid hurting the thousands of crested ibises that fly near one part of the railway, protective nets have been set up along the tracks to make sure the birds will not fly into a train.

为了避免伤害在铁路附近飞行的数千只朱鹮，铁路沿线已经设置了防护网，以确保这些鸟儿不会飞进火车。

youdao

Some birds will fly away to the south, other birds will fly north.

一些鸟会往南飞，其他的鸟往北飞。

youdao

Some birds fly in groups for safety, while others fly alone.

有些鸟类会为了安全而成群地飞行，而其它鸟类则独自飞行。

youdao

And the other part about it is if feathers were twice as heavy, or half as strong, then birds couldn't fly."

VOA: special.2010.06.01

Why,if there was two birds setting on a fence, he would want you to decide which one would fly first so he could win money.

VOA: special.2009.08.29

And hundreds of kinds of birds have been sighted in the park which serves as a stopping area for birds as they fly to other places.

VOA: special.2009.10.30

Unlike shooting partridge in Spain, where the birds fly low due to the landscape, here they are much higher.

WSJ: Scotland's Cawdor Estate

Breeders of homing pigeons have been prevented from letting their birds fly freely.

NPR: China's Bird Flu Response Shows New Openness

According to a 1998 study by Louisiana State University, more than 500 million birds fly over the Gulf and enter the United States along coastal areas in Louisiana and Texas each spring.

CNN: Oil spill could be disaster for animals, experts say