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. ‚ÄčThe 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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