|Photo by Dendroica cerulea|
After doing some research, it appears that it is a territorial response. He and his mrs are obviously building a nest close by - and we've heard some knocking on the roof near the window too. However, the male sees his reflection in the window and thinks another male is in his territory so raises his head feathers to try and warn his off. Unfortunately the other robin - ie his reflection - raise his feathers too - and so the robin tries to attack the other bird and send him away. Obviously the other bird does the same thing and so Mr Robin spends all his day attacking his reflection instead of nest building, singing and eating which he should be doing.
|Photo by ibm4381|
We've put up a cover on the one window so he can't see himself in it and hopefully he will get back to his normal spring time activities instead - and get rid of his headache!
Poor little thing. We'll be keeping an eye out for him.