Sept 4 The fish that hunts pigeons

BBC Earth｜捕食鸽子的巨鱼
The Fish That Hunts Pigeons
Planet Earth II | BBC Earth

Losing its fear of humans has enabled one animal to spread into cities everywhere and in huge numbers. Pigeons are by far the most successful urban bird.
失去对人类的恐惧，使一种动物能够大量地扩散到世界各地的城市。鸽子是迄今为止最成功的城市鸟类。

Here in Albi, in the south of France, the pigeons come to the river to bathe. They need to preen their flight feathers, clean off the city dust and cool themselves down.
在法国南部的阿尔比，鸽子们来到河边沐浴。它们需要梳理自己的飞行羽毛，洗去城市的灰尘，给自己降降温。


But death lies in wait. A predator that has taken advantage of the very thing that has led to the pigeon's success, their lack of fear. As the pigeons bathe, oil from their plumage flows downstream and is detected.
但是死亡正潜伏着。一种捕食者充分利用了鸽子成功之处——它们的无畏。当鸽子沐浴时，它们羽毛上的油流向下游，并被捕食者察觉。

A monstrous wels catfish. Introduced here just forty years ago, they have proliferated, virtually exterminated the local fish stocks, and they've now developed a taste for pigeon.
一条巨大的欧洲鲶鱼。四十年前它们才被引入这里，现在已经大量繁殖，几乎消灭了当地的鱼类种群，现在它们开始喜欢吃鸽子了。

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