【科学60秒】蚂蚁"捍"大树_英语听力练习mp3下载-自然-沪江听力酷

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【科学60秒】蚂蚁"捍"大树

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We all know that elephants aren’t really scared of mice. But a new study shows that they’re really not crazy about something even smaller: ants. In fact, elephants dislike ants so much that they avoid acacia trees that ___1___ the tiny, six-legged nectar-suckers.
On the savanna, acacia trees growing in regions that get a lot of elephant traffic tend to get eaten. But researchers noticed that one species of acacia was not much ___2___ by elephants. And that the untouched acacia was a favorite ant habitat.
So the scientists ___3___ the ant-covered acacia of their bodyguard bugs, and sure enough, the elephants chowed down. In addition, when the insects were placed on previously ant-free acacias, the elephants took a pass.
But how can teeny, tiny ants ___4___ a big old elephant, which is, after all, about a billion times more massive? The answer is in the trunk. Or rather, not in the trunk. Because, as you can probably relate, elephants really hate to have ants up their noses.
The research is published in the journal Current Biology. And it suggests that adding ants could help ___5___ wooded areas on the savanna. Because ants will ruin any picnic, even for pachyderms.