Question: Because the audible range in bats is about (10 mathrm{kHz}) to more than (120 mathrm{kHz}), these animals are oblivious to normal human conversation, which is

Because the audible range in bats is about $10 \mathrm{kHz}$ to more than $120 \mathrm{kHz}$, these animals are oblivious to normal human conversation, which is at frequencies of typically several hundred hertz. If you shout, though, you may in fact startle a bat. Why?

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