Interesting note on Portland website about thrushes giving strange noises. See: http://www.portlandbirdobs.org.uk/aa_latestnews.htm
I noticed a small group of 3 Song Thrushes on a beach yesterday giving thin, high-pitched calls - quite different to the usual tics and chaks.
This calls are presumably stress-related as a result of cold weather.
Anybody noticed any other species giving odd noises of late?