Bill,
As I remember, back to 1994, the location was a bluff overlooking the
Rio Grande River in New Mexico where there were a lot of bat caves. I
don't remember being swarmed necessarily but rather dive bombed
repeatedly. It was a little unnerving so I kept the radio off.
I will ask this question to my VLF colleagues and see if there are any
similar experiences and report back if so.
Thomas
werainey wrote:
> 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
>>
>>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
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