The cochlea is capable of exceptional sound analysis, in terms of both frequency and intensity. The human cochlea allows the perception of sounds between 20 Hz and 20 000 Hz. All sounds below 20 Hz are qualified as infrasounds, althought some animals (ex. mole-rat, or elephant) are hearing them. Similarly, all sounds above 20 kHz are qualified as ultrasounds, but their are sounds for a cat or a dog (up to 40 kHz) or for a dolphin or a bat (up to 160 kHz).
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