1. School of Biology, University of St. Andrews, Sir Harold Mitchell Building, St. Andrews, Fife KY16 9TH, United Kingdom
2. Helmholtz Centre for Environmental Research, Permoserstraße 15 Leipzig, 04318, Germany
3. K. Lisa Yang Center for Conservation Bioacoustics, Cornell Lab of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, New York 14850, USA