Re: sequoia groves recording August 8-10

["Dan Dugan" dandugan_1999]

Bill Rainey, you wrote,

> In those areas in Yosemite, you are likely to record a couple of bat  
> species that call in the
> audible. There are spotted bats with short (5ms) chirp sweeping from  
> 20 KHz to 6-8 KHz
> at maybe 125 ms interval. These hunt in less cluttered situations in  
> the groves. You could
> also pickup mastiff bats above the canopy which are very loud and  
> produce ca  20 ms
> pulses at longer intervals.
>
> Social calls of many predominantly ultrasonic bats also drop well  
> into the audible, so it
> may not be an aliasing issue, but you can see quickly whether bat  
> calls are aliased or not
> from the way the pattern frequency change in the calls.

Thanks for this very helpful information. When I can get to it I'll  
extract the best bit I can find to share. I look forward to expert  
opinions.
>


-Dan Dugan