February 13, 2013
Song Sparrow Giving Soft Songs and Wing Waves
Song sparrow giving soft songs and wing waves in response to a simulated intruder. This is from a trial in the experiment reported in Akçay, Ç., Tom, M., Campbell, S. E. & Beecher, M. D. Song type matching is an honest early threat signal in a hierarchical animal communication system. Proceedings of the Royal Society of London, Series B.
credit: University of Washington