bioRxiv preprint doi: https://doi.org/10.1101/860882; this version posted May 5, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Females don’t always sing in response to male song, but 2 when they do, they sing to males with higher pitched songs 3 4 Alexander N. G. Kirschel1,2,3*, Zacharo Zanti1, Zachary T. Harlow3, Edgar E. 5 Vallejo4†, and Martin L. Cody3, and Charles E. Taylor3. 6 †Deceased 19th June 2019 7 1Department of Biological Sciences, University of Cyprus, P.O. Box 20537, Nicosia 8 1678, Cyprus 9 2Edward Grey Institute, Department of Zoology, University of Oxford, South Parks 10 Road, Oxford OX1 3PS, United Kingdom 11 3Department of Ecology and Evolutionary Biology, University of California, 621 12 Charles E. Young Dr. South, Los Angeles, CA 90095–1606 13 4Department of Information Technologies and Computer Science, ITESM-Campus 14 Estado de México, Estado de México, Mexico 15 16 *Corresponding author:
[email protected]; Tel: +35722892660 17 18 Abstract 19 The long-held view that bird song is exclusively a male trait has been challenged 20 recently by a number of studies and reviews highlighting the prevalence of female 21 song. In spite of that, there remains a lack of knowledge on the function of female 22 song, with most evidence thus far focusing on females performing duets with males in 23 courtship displays, typically for joint territory defence or mate guarding purposes.