Re: impact of noise on bats

["werainey" werainey]

Very interesting! Was more than one bat approaching the receiver at a time? 
What sort of 
sounds were produced by the speaker? AFAIK there aren't many reports  of 
foraging NAm 
bats attracted by audio range sound. There is an expensive ultrasonic bat 
social call 
synthesizer used in netting surveys for an  uncommon species in the UK. 

Bill R.
--  
> For what it's worth, one time I was monitoring for meteors and fireballs 
> with a handheld McGreevy WR-3 ELF/VLF radio receiver which operates at 
> between 0.2 - 11 kHz. Whenever I switched on the radio bats would go 
> into a frenzy and dive right down to the radio.  I'm not sure if they 
> were attracted to the sound or if it was annoying them.  After a few 
> moments of bats diving at my handheld radio I got the message to switch 
> the radio off.
> 
> Thomas Ashcraft
> New Mexico
>