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Re: 3032 capsules & bats

Subject: Re: 3032 capsules & bats
From: madl74
Date: Sat Jun 14, 2014 4:08 pm ((PDT))
> About silence, just recently I had a wonderful experience in the abandone=
> tunnels (a 12 km network) of a chalk cave. Absolute silence improved by
> soft sound absorbing chalk powder and very irregular tunnel surfaces. Nex=
> time I go there with my microphones and recorders for doing some tests. I=
> some larger tunnels we found bats colonies, their social calls were
> fascinating, but the most impressive noise was those of the wings of the
> bats flying when disturbed. I did some recording with a phonometer but it=
> noise floor was higher than the ambience noise, probably I'd need the GRA=
> microphone to make measures there.
> Next time I'll go there with my usual microphones and recorders for doing
> some recordings.


This afternoon I was back with the bat roost I have been monitoring with IR=

cameras and ultrasound for some time. Try to get hold of a cheap heterodyne=

bat detector to hear all the ultrasounds you are missing. It's a whole new=

world of sound.

These bats are a maternity roost of Lesser Horseshoe bats, and they are
surprisingly active in the daytime in a dark loft space. More fun will come=

later as the youngsters learn to fly.

It's not just bats that you can hear with a detector, but many insects and=

small mammals also emit ultrasound.

David Brinicombe

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