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These are edits from an all-night drop-rig recording made next to a lake on Crete in June 2024. There is a short silence between each edit.
I have edited just the clearest brief appearances of a horseshoe bat. Other bats are heard but the horseshoe bat is the one that is producing the intermittent sustained tones.
The recording was made at 192 kHz but this has been changed to 8000 Hz to make the sounds of the bat audible. Playback is therefore 1/24 of normal speed. At normal speed, the sustained tone fundamentals are at around 40 kHz with an overtone captured at around 80 kHz. A short glissando up to and down from each tone is part of each utterance. These echolocative pulses are described as using 'constant frequency' (CF) and through this, the bat creates an understanding of its environment by analysing Doppler shift in reflections. This Doppler shift is audible in this example as a slight detuning or chorussing effect. More bats use frequency modulated (FM) pulses and instead analyse time delays in the echoes.
In the penultimate excerpt beginning at 1:15 there are two horseshoe bats.
I am not certain which type of horseshoe bat I have captured here as its sustaining frequency is lower than the ones I am familiar with. Any help with this is gratefully received!
Recording was made using a pair of Knowles ultrasonic MEMS capsules into a Zoom F3.
Type
Wave (.wav)
Duration
3:04.031
File size
8.4 MB
Sample rate
8000.0 Hz
Bit depth
24 bit
Channels
Stereo
2 months ago
thank you for this sound and the explainations also are quiet interesting. thanks for sharing