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Our cities are always changing. Sometimes very swiftly.
我們的城市在不斷變化。有時極為迅速。
And animals must cope with the changes, or disappear.
動物們必須應對這些改變，否則就會消失。
One of the greatest changes in recent times has come from a single invention made less than 140 years ago.
近年來，最大的變化之一是由一項歷史還不到一百四十年的發(fā)明引起的。
Electric light. It has become more and more powerful, filling our streets with light.
電燈。它的影響力越來越大，點亮了我們的街道。
It's everywhere in the city. It even goes under ground.
城市燈光無處不在。甚至延伸到地下。
The difference between day and night is becoming less and less perceptible.
白天與黑夜的區(qū)別愈發(fā)難以分辨。
And that has a profound effect on the activities of wildlife.
這對野生動物產生了深遠的影響。
In the wilderness, light triggers all kinds of behaviour.
在野外，光引發(fā)動物的各種行為。
