A research team led by the Museum für Naturkunde presents the first evidence that several bat species produce courtship songs in the immediate rotor-swept zone of wind turbines while circling around the nacelle. Data from over 80,000 audio recordings at nacelle height from six German sites, together with stereo-thermal 3D reconstructions of bat flight trajectories, document both bat song and elevated bat density in the rotor-swept zone. Both lines of evidence suggest that, under certain circumstances, bats actively approach wind turbines and provide an explanation for why collision risk may increase during the mating season.
Male bats sing in the rotor-swept zone of wind turbines, potentially raising collision risk
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