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Before an eruption, the Earth's surface starts vibrating. This vibration causes infrasonic sound waves which are below the audible range of human hear (i.e. 20Hz-20kHz). But some animals can hear these infrasonic waves and are aware of the danger. So they start moving in a direction opposite to the source of these waves. Birds take to the air.

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Q: Why do animals often behave strangely before an eruption?
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