Recording animal vocalizations from a UAV: bat echolocation during roost re-entry

Scientific Reports
Laura N Kloepper, Morgan Kinniry

Abstract

Unmanned aerial vehicles (UAVs) are rising in popularity for wildlife monitoring, but direct recordings of animal vocalizations have not yet been accomplished, likely due to the noise generated by the UAV. Echolocating bats, especially Tadarida brasiliensis, are good candidates for UAV recording due to their high-speed, high-altitude flight. Here, we use a UAV to record the signals of bats during morning roost re-entry. We designed a UAV to block the noise of the propellers from the receiving microphone, and report on the characteristics of bioacoustic recordings from a UAV. We report the first published characteristics of echolocation signals from bats during group flight and cave re-entry. We found changes in inter-individual time-frequency shape, suggesting that bats may use differences in call design when sensing in complex groups. Furthermore, our first documented successful recordings of animals in their natural habitat demonstrate that UAVs can be important tools for bioacoustic monitoring, and we discuss the ethical considerations for such monitoring.

References

Feb 1, 2003·The Journal of the Acoustical Society of America·Arjan M BoonmanGareth Jones
Aug 13, 2004·Proceedings. Biological Sciences·Nachum UlanovskyCarmi Korine
Feb 14, 2013·PloS One·Cédric VermeulenPhilippe Bouché
Mar 18, 2016·Scientific Reports·Jarrod C HodgsonRohan H Clarke
Apr 14, 2016·Royal Society Open Science·Laura N KloepperJames A Simmons
Dec 22, 2017·Scientific Reports·Émile Brisson-CuradeauKyle H Elliott
Mar 3, 2018·The Journal of the Acoustical Society of America·Yanqing Fu, Laura N Kloepper

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Citations

Jun 4, 2019·The Journal of the Acoustical Society of America·Charlotte RoemerYves Bas
Dec 18, 2020·Animals : an Open Access Journal From MDPI·Chang-Uk HyunWon Young Lee
Jun 3, 2021·Scientific Reports·Gabrielle EdnieKyle H Elliott

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Software Mentioned

SPSS
Audacity
MATLAB

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