explain how bats use ultrasound to catch the prey

 Bats emit  ultrasonic waves from their mouth ( squeaks ). When these touch the prey, the waves get reflected back to the bat. the bat detects these waves and his brain estimates the distance and direction of the prey by the time taken, the loudness of the sound and the direction of the sound.

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Bats catches its prey by emitting and detecting reflections of ultrasound waves. These waves are then reflected by the prey and reaches the bat's ear. The nature of reflections tells the bat where is it located and also its nature.  

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