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"Utrasound cannot be detedted by humans ...

"Utrasound cannot be detedted by humans but can be by other animals". Elaborate this statement.

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The audible range for dogs extends to about `40 kHz`. Cats and bats have even higher audible ranges upto `70 kHz and 100 kHz` respectively.
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(a) Many animals can move the pinna (or ear flap) in order to focus their hearing in a particular direction. What do the humans do for the same purpose ? (b) What is tinnitus ? ( c) "The hair cells of cochlea are very critical to hearing." Elaborate this statement.

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