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why cant we hear the sound made by bats ?

As we know, a bat emits ultrasonic waves of high pitch to avoid from obstacles or for hunting their preys.
Frequencies higher than 20 kHz are called ultrasonic sound. ​The audible range of sound for human beings extends from about 20 Hz to 20 KHz.
Hence, we are unable to hear the sound made by them.

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Bats use echolocation to sense movement and their surroundings. We cannot hear the high pitched noise they emit because it is of a higher frequency than the human ear can register. There are some sounds of a bat that we can hear, but the sounds that we can't hear is because the squeaks are so high that you really need ultrasound to hear it.
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