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Sound emission in whales...

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Is the method to generate sound in cetaceans analog to a human vibrating lips as in playing a trumpet ?

 

Are the pressure waves in the melon organ direct result from 'lips' closed and opened obturing/releasing air many times per second ?

It does imply some air exiting past their 'lips' while vocalizing; is that right ?

The melon or spermaceti organs are to enhance volume by resonance, as a guitar body does, is that right ?

Is the animal sound emission omnidirectional and its echo reception directional ?

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