People also should make indoor plants less visible to passing birds.

人们也需要隐藏室内植物，避免路过的鸟类看到。

Also, it does not create noise and-even more important for many environmentalists-it does not present a threat to passing birds.

另外它不会产生噪音，而且对环保人士而言更重要的是不会对路过的鸟类构成威胁。

If a pupfish doesn't fart this gas out, it becomes buoyant— making it easy prey for passing birds.

如果一条鳉鱼不把这种气体放出去，它就会浮起来——很容易成为路过的鸟类的猎物。

For 40 years Mr Jin has used a net, simple decoy birds and a bamboo whistle to lure passing birds towards his nets.

四十年来，金先生使用渔网，简单的假鸟与竹哨来诱使路过的鸟儿飞向他的网。

Now onto the mountains of western Iran, where a spider crawls across a rock, making easy prey for a passing bird — or not.

现在攀上伊朗西部的山区，那儿有蜘蛛正在岩石上爬行，让经过的鸟轻松猎捕——或者相反。