Raymond,
Thank you, so it is Luscinia megharhincos only, and there is no frog. You a=
re absolutely shure that the files in xeno-canto you posted are only the Lu=
scinia megharincos call and no frog in it? The "croak" is in the Luscinia =
repertoir for shure?
Regards,
Jos=E9
--- In "Raimund" <> wrot=
e:
>
> Jose, listen to this:
>
> http://www.xeno-canto.org/80308
> http://www.xeno-canto.org/72695
>
> The impression that the frog-like second part of the alam call comes from=
a different direction might simply be caused by its lower frequency (its a=
verage frequency is only about have of that of the whistle). This frequency=
difference alone will cause a different directionality. High-pitched sound=
s are generally emitted more directional than lower ones, depending on the =
physical size of the sound source.
>
> The effect could also be caused by the M/S microphone system itself becau=
se the polar pattern of any microphone always changes a bit with the signal=
frequency.
>
> Regards,
> Raimund
>
>
>
> --- In "freitojos" <josefreitas81@> wro=
te:
> >
> > John,
> > I think that it is a bird and a frog, the bird I don't know ( I have pr=
esumed luscinia megarhincos but it can be other bird, the frog I think is H=
yla meridionalis, but it can also be, hyla arborea or rana perezi. the plac=
e is well studied by scientists because it is a place that is part of the U=
niversity of Lisbon,and in the papers there are only these tree frogs and t=
he sound seems to me hyla meridionalis.
> > Jose
> >
> >
> > --- In "hartogj" <hartogj_1999@> wrot=
e:
> > >
> > > Hi Jos=E9,
> > > I listened to it after balancing the M and S, and I will agree with D=
avid that it does sound like the calls are coming from two different positi=
ons. I am not familiar with the specific species, but I could surmise a few=
possibilities. It could be a bird and a frog. It could be two birds. It co=
uld be one bird projecting calls in two directions.
> > >
> > > John Hartog
> > > rockscallop.org
> > >
>
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