Food for thought ...
http://www.birdguides.com/webzine/article.asp?a=3847
Sonic Genitalia
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Mark Colvin
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- Location: West Sussex
Re: Sonic Genitalia
Fascinating! Presumably, the evolutionary story is that some moths that enjoyed rubbing their genitals 
survived bat predation better than those that did not and, hence, passed on the relevant genes.
Mike
survived bat predation better than those that did not and, hence, passed on the relevant genes.Mike