while some whales can hear infrasonic sounds as low as 7 Hz.

Physiology

The 'hairs' in hair cells in the inner ear, stereocilia, range in height from 1 um, for auditory detection of very high frequencies, to 50 um or more in some vestibular systems.

Measurement

A basic measure of hearing is afforded by an audiogram, a graph of the absolute threshold of hearing

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