英语听力：自然百科 秋日黄石公园 Autumn—14

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Their search for winter grazing takes them over a hundred miles to the south of Yellowstone, the longest migration¹ of any American mammal. They have made this journey every year since the last ice age. But nowadays, they have a problem. Their traditional winter refuges lie right above some of the richest natural gas deposits in America. The wells are no direct threat to pronghorn. But pronghorn are timid. At the slightest noise, they run. And when they run, they run at 60 miles per hour. They evolve to avoid cheetahs² not juggernauts. Trucks, fences and the disturbance³ from the wells have put pronghorn at risk. 

 

There are 1.2 million acres here. But 75% of it is now being earmarked for gas and oil. Back in the farmland, the elk⁴ have found food. But this grass is not meant for them.

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