I don't know if anyone will be able to help me with this, but I thought I w=
ould give it ia shot. =0D
=0D
=0D
I was our recording some frogs for the Texas Amphibian Monitoring program =
last night and I once again recorded something strange that I have recorded=
before on occasion. Once in a while when recordings Anurans at night here=
in Texas, I will record a high pitched downward slurring call that is clea=
rly not an amphibian. It is also not audible to me while recording but sho=
ws up clearly in the spectrogram.=0D
=0D
=0D
It is usually a series of descending calls somewhere from around 14 Khz do=
wn to about 11 Khz. I don't believe it is an insect because it is too spo=
radic. I will only record it once or twice in a 5 minute recording sample =
at most.=0D
=0D
=0D
I know the calls of all the local amphibians so I know it isn't that. I a=
m just wondering if anyone has any ideas what it could be.=0D
=0D
=0D
You can see the sample spectrograph here http://www.pbase.com/sandboa/imag=
e/152879059 http://www.pbase.com/sandboa/image/152879059.jpg. The frogs ar=
e Spotted Chorus Frogs whose calls are focused around 3Khz. But above this=
I captured the descending call.=0D
=0D
=0D
And in case you wanted to hear it, I brought it down a more audible range =
of around 3-4Khz and you can hear that transposed version here - http://www=
.birdsandherps.com/sounds/high_pitched_sound.mp3 http://www.birdsandherps.c=
om/sounds/high_pitched_sound.mp3=0D
=0D
=0D
Anyone have any ideas? Bat?=0D
=0D
=0D
Thanks,=0D
=0D
=0D
Chris=0D
=0D
=0D
=0D
=0D
"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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