On three different occasions on july 2007 I could record this day-light sound, that could be either produced by a cricket, a cicada, another insect, or maybe a chick (young bird).
The recordings were made with the microphone of a digital camera, which only registers below 8kHz, and the quality is rather bat, so the discrete sounds are confused. The frequency spectra seems to be high, mainly over 6 kHz. They are now joined in one excerpt with three parts:
a) 7.vii.2007, 30ºC, with Cicada orni in the background. Echemes last 220-280 ms, repeated at a rate of 1.7 e/s.
b) 15.vii.2007, 29ºC, with Cicada orni and Tettigettalna argentata in the background. Echemes of 140-170 ms, repeated at a rate of 2.1.
c) 22.vii.2007, 23ºC, with Cicada orni and Ephippiger ephippiger in the background. Echemes of 380-420 ms, repeated at a rate of 1.5.
It was recorded the three occasions in the same place (picture above), in an abandoned field with some scattered trees. That's why I think it must be the same species, which I have not heard again. It seems the sound came from the canopy of a tree, but is not sure.
Click here to listen (also download is possible by registering):
http://yourlisten.com/channel/content/16951004/Unknown_stridulation
[Iberian peninsula: Catalonia: Girona province: Sales de Llierca: Cal Boc, 260 m][ICC map]
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