Answer:
Bats search out prey and fly at night by emitting and detecting
reflections of ultrasonic waves.
Bats emit high-frequency ultrasonic squeaks while flying and
listen to the echoes produced by reflection of their squeaks from the obstacle,
prey or object in their path. From the time taken by the echo to be heard, bats
can determine the distance of the object and can avoid the object by changing
the direction without colliding with it.
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