英语听力：自然百科 秋日黄石公园 Autumn—14
时间：2014-08-27 08:22:44
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（单词翻译）
By now the pronghorn have pushed further than any of Yellowstone’s animals, out of forests, through farmland and down into the wide prairies at the foot of the Rocky Mountains themselves.
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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