I think the paper was by Kirchner et al from Germany.  They show that bees
do hear, but only sensing particle movement, instead of pressure changes
(as we do), so that the hearing is only very short distanced.
The old wisdom says bees can only feel substrate vibrations.
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Hope this helps.             Huang
 
>
>I'll have to sheaf thru to find the ref. but I recall a recent
>article showing evidence that bees indeed do hear.