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Our cities are always changing. Sometimes very swiftly.
我们的城市在不断变化。有时极为迅速。
And animals must cope with the changes, or disappear.
动物们必须应对这些改变，否则就会消失。
One of the greatest changes in recent times has come from a single invention made less than 140 years ago.
近年来，最大的变化之一是由一项历史还不到一百四十年的发明引起的。
Electric light. It has become more and more powerful, filling our streets with light.
电灯。它的影响力越来越大，点亮了我们的街道。
It's everywhere in the city. It even goes under ground.
城市灯光无处不在。甚至延伸到地下。
The difference between day and night is becoming less and less perceptible.
白天与黑夜的区别愈发难以分辨。
And that has a profound effect on the activities of wildlife.
这对野生动物产生了深远的影响。
In the wilderness, light triggers all kinds of behaviour.
在野外，光引发动物的各种行为。
