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Low Frequencies

Della Wrote:

>Also, I have read in several
>places now that low frequencies travel greater distances than high

Apparently  elephants use this form of communication for distances (I have 
quoted) of up  to 200 km.

Pigeons are supposed to be able to hgear very low frequencies as well, over 
great distances. They are supposed, for example, to be able to "hear" weather 
conditions in mountain ranges over which they must fly hundreds of kilometers 

Sorry, I don't have references but I'm sure our more knowledgeable readers will 
be able to give you some pointers.