Thanks Bill--this bat was recorded at Upper Cora Lake, Ansel Adams
Wilderness bordering southern Yosemite NP, August 08.
I am grateful for the (likely) ID of Western Mastiff!--this is an
area I've known all my life, and have mompiled a list of birds and
mammals over many backpack trips. Wonderful to get to add a mammal
species--this will be two mammals in one trip if the sound I posted a
while back proves to be a tail-slapping Beaver.
David
--- In "werainey" <>
wrote:
>
> David,
> Nice recording, From the frequency range and how it sounds
downconverted 10X it is
> almost certainly the Western Mastiff bat (Eumops perotis), North
America's largest bat.
> There are only a couple of other species in the region that reach
frequencies that low and
> they don't sound similar. The Interpulse interval with
such 'cruising calls' is usually around
> .5-.75 second, but may extend to a second. Between calls they are,
in essence, waiting for
> the echoes.
>
> Can you indicate more specifically where you made the recording?
The species seems to
> be less frequently encountered on the eastern slope of the Sierra
than on the west and, at
> this point, we have few recordings north of the latitude of Red
Bluff.
>
> Bill R.
> > Hi Naturerecordingists, here is an mp3 of a bat I recorded in the
Sierra at 8000 feet,
> Mkh 20 Mod SASS into SD 702. First 12 sec is as recorded, from 7 to
11 Khz; then the
> same sounds dropped in pitch to 700 to 1100 hz, using Audition's
Pitch Bender. In
> spectral view I cut out all but the target sounds. I think it is
quite a beautiful sound, with a
> lot of reverb, I had no idea. Is there an authoritative source for
identifying bat species by
> their sound?
> >
> > Thanks,
> > David
>
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