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we could record insects with hydrophone but a lot of them speak with ultrasonic frequency (up to 16000Hz), bats also use also this frequency as a sonar, and some others animals… this is recording made with special device that translate those communications.
19 juillet 2007 - Pommerie
Recording made at the exit of the gouffre when the bats goes out to hunt
we catched 4 species :
le grand rinolophe
le minioptére de schreibers
le grand murin