Audiomoth recording of Rhinolophus ferrumequinum

Here is how sometimes it is difficult to assess at a glance the presence of this type of signal on files of a considerable length (in this example the total time of the file is 15 minutes). Only by gradually zooming in, you can adequately perceive the signal with the unmistakable characteristic shape “u upside down”, given the frequency around 80 Khz.

The Rhinolofus signal is pratically at the limit of the visualisation!
Here the signal after a slight zooming
Finally, the unmistakable Great Horse-shoe Bat signal!

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