Song sparrow giving soft songs and wing waves in response to a simulated intruder
Channel: Çağlar Akçay
Date: 2013-02-04

This video is from a trial in the experiment reported in Akçay, Ç., Tom, M., Campbell, S. E. & Beecher, M. D.  (2013)  Song type matching is an honest early threat signal in a hierarchical animal communication system.  Proceedings of the Royal Society of London, Series B.