十万个为什么·科学阅读30篇（5）
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How Do Bats Find Their Way in Total Darkness?
蝙蝠怎样在完全黑暗中找到路？
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Bats send out high-pitched sounds we cannot hear.蝙蝠发出人类听不见的高音。
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These sound waves bounce off walls, trees, and insects.这些声波会从墙壁、树木和昆虫身上反弹。
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Bats listen for the echoes with large, sensitive ears.蝙蝠用大而灵敏的耳朵接收回声。
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Their brains measure echo timing and direction quickly.它们的大脑迅速判断回声的时间和方向。
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This skill is called echolocation, like natural sonar.这种能力叫回声定位，类似天然声呐。
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Most bats use it more than their eyes at night.多数蝙蝠夜间更依赖回声定位而非视力。
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Some moths can hear bat calls and fly away fast.有些蛾子能听见蝙蝠叫声并迅速逃开。
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Echolocation helps bats catch food and avoid danger safely.回声定位帮助蝙蝠安全捕食并避开危险。