十万个为什么·科学阅读30篇（3）
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How Do Bats Find Their Way in the Dark?
蝙蝠如何在黑暗中找到路？
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Bats fly at night and never bump into trees.
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They use sound waves to 'see' their surroundings.
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This skill is called echolocation.
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A bat sends out high-pitched sounds we cannot hear.
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The sounds bounce off walls, insects, or branches.
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Then the bat listens for the echoes to know where things are.
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Its ears are very large and sensitive.
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This helps it hunt and avoid danger in total darkness.