Merci Jean-Francois by all the info, you are definitely right.
Actually bat spectrograms (eg
http://www.mnhn.fr/museum/front/medias/publication/5194_m04n4a7.pdf)
look completely different from my recording.
Saludos
D
--- In "Jean-Francois Julien"
<> wrote:
>
> Hola,
>
> that's an insect for sure. Bats can emit a rapid succession of
> very frequency-modulated sounds (almost vertical on a sonagram) when
> capturing (or attempting to) an insect but the pattern is different
> and it does not sound the same at ear. It is that bat workers call a
> "buzz". Usually the very end of the buzz is emitted at frequencies
> lower than the usual echolocation calls of a given species.
> However, you can encounter in and around Sevilla a low
> frequency (11 to 16 kHz) emitting bat, the Greater Noctula (Nyctalus
> lasiopterus), now infamous after the demonstration by a Coto Do=EF=BF=BDa=
na
> based team of its bird-eating habits. Its calls are loud, with a low
> repetition rate (0.4s to 0.9s intervals) and it is fairly easy to
> record it with plain audio equipment. It roosts in Sevilla and uses
> to forage above Do=EF=BF=BDana.
>
> --- In "dobroide" <dobroide@> wrote:
> >
> >
> > noticed a series of ultrasonic calls in a recording I did the
other day
> > at dusk in a scrub/juniper area near Donana, S Spain.
> >
> > sound sample
> > <http://freesound.iua.upf.edu/samplesViewSingle.php?id=3D37231>
> >
> > spectral view
> > <http://farm2.static.flickr.com/1034/761823513_33cf92597c_o.jpg>
> >
> > 15-21 kHz (and above, obviously), they are strong and show a
pattern. At
> > first I thought of a bat, but maybe they were done by an insect (?).
> > Similar calls appear often during summer so I would appreciate any
> > hint. Just curious.
> >
> > Regards
> >
> > D.
> >
> >
> >
> >
> >
>
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