Not long ago, he found that the bluebirds were nesting in the dead trees which were often cut down, so he began to make bluebird boxes for the birds in order to save them.
不久前，他发现蓝知更鸟在枯树上筑巢，而这些枯树往往会被人们砍去，于是他开始为这些鸟制作蓝知更鸟箱，以拯救它们。
Animals such as cats, dogs and possibly other mammals can also become infected by eating infected dead birds; however, it is not yet known whether mammals can pass the virus back to live birds.
猫狗等动物可以应食用病死鸟类而感染该病，但哺乳动物是否会将该病毒传染给鸟类则不明确。
And of course dead trees do not provide habitats only for harmful insects. They are also used by birds and other insects that are important contributors to the long-term health of forests.
而且，死树不是仅仅为害虫提供栖息地，鸟类和其他昆虫也会居于与此，这些鸟类和昆虫对于森林的长期健康是有利的。
And of course dead trees do not provide habitats only for harmful insects. They are also used by birds and other insects that are important contributors to the long-term health of forests.
而且，死树不是仅仅为害虫提供栖息地，鸟类和其他昆虫也会居于与此，这些鸟类和昆虫对于森林的长期健康是有利的。
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