BBC听力 | 奇幻沙漠 15
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As the day warms up, the lizards move away from their cracks
随着白天气温的升高，蜥蜴离开它们藏身的岩缝
and head down to the bottom of the gorge.
奔向峡谷底部
Their goal is the river.
它们的目标是这条小河
There is no food at the edge, but this desert river holds a secret.
河边没有一点食物，但是这条沙漠河流却藏着一个秘密。
Each day, black fly rise from turbulent stretches of the river.
每天，成千上万的蚋从奔腾的河水中羽化
This is what the lizards have come for.
这就是蜥蜴到此的目的
The black fly never land, so the lizards have to leap for their food.
蚋不会降落，所以蜥蜴必须跳起来捕食。
In one day, each of these acrobatic little lizards may catch 50 flies.
每只身怀绝技的小蜥蜴一天能吃掉50多只小虫
There are plenty of flies to go around, even with hundreds of lizards competing for them.
尽管已有几百只蜥蜴在此捕猎，这里仍聚集着无数飞虫
Away from these rapids, flat lizard populations are found in much smaller numbers.
在远离这些急流的地方，扁石蜥的数量则要少得多
But here, one unusual abundance has produced another.
但在这里，一种特别的资源带动了另一物种的兴起。
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