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  • 英语听力:自然百科 秋日黄石公园 Autumn—18

    his is a tree that needs a cold winter. Its now November and the elk have found their feeding grounds just in time, the snows of winter at their heels. Here they join other herds who come to this place every year, where the snow would be less deep an...

  • 英语听力:自然百科 秋日黄石公园 Autumn—17

    And for every dam, there is a new habitat for new life, and a richer, more diverse Yellowstone. But just as Yellowstone reveals the complexity of life, it also exposes its fragility. On its lofty ridges, there are signs that all is not well with the...

  • 英语听力:自然百科 秋日黄石公园 Autumn—16

    The return of the wolf will always be controversial. But evidence is now emerging that wolves are far more important than anyone imagined, especially back in the heart of Yellowstone. It's nearly the end of October. The cold autumn nights have brough...

  • 英语听力:自然百科 秋日黄石公园 Autumn—15

    Ranchers will tolerate elk as long as they don't compete too much with their cattle. But as the elk move in, their old enemy follows them out of Yellowstone, an animal that's more difficult for ranchers to accept. In their minds, fear of the wolf run...

  • 英语听力:自然百科 秋日黄石公园 Autumn—14

    By now the pronghorn have pushed further than any of Yellowstones 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...

  • 英语听力:自然百科 秋日黄石公园 Autumn—13

    To stay is to face the certainty of snow and wolves. To go offers the chance of an easier life, but the uncertainty of the world beyond Yellowstone. Every autumn, thousands of elk do leave Yellowstone, and as they go, they cross an invisible line out...

  • 英语听力:自然百科 秋日黄石公园 Autumn—12

    Now he must gather the last of his strength. The rival wants to take him on. The aim is to get an antler point into his neck. But they are evenly matched. Neither can penetrate the other's guard. Now, it's all about power. A well-aimed thrust or a br...

  • 英语听力:自然百科 秋日黄石公园 Autumn—11

    Groves of aspen/ all turn at the same time, each grove descended from one tree interconnected by roots, color coordinated. As cold air sinks further down from the mountains, it brings autumn mist to Yellowstones valleys. It was in the autumn of 1870...

  • 英语听力:自然百科 秋日黄石公园 Autumn—10

    In just a few weeks, this lake will be frozen, and the beavers wont be able to cut and move trees, but they will be able to swim right under the ice to feed from this underwater larder. Moose also eat twigs and branches and often try to take advantag...

  • 英语听力:自然百科 秋日黄石公园 Autumn—9

    It cuts branches into more manageable lengths and then swims them down a network of purpose-built canals towards the dam. The pond to give this beaver protection from predators, and the canals allow it to forage far into the forest, carrying many tim...

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