If you can see my reflection in our bedroom window as I'm taking this picture, you can be assured that the robin saw his as well. The difference is, there is a photograph of a crow that has been printed and pasted to the window. The robin said,"this is not a friendly picture" as he saw his own image in the window. The robin left and went to another window. We now have crow prints on all windows which he thought was his territory. No more pecking on the windows.
Proof of the eating is in the pudding, they say. Well, in years past there have been several robin nests around the house which I was not allowed to destroy until the young robins had fled the nest. There are no new nests. Thank you Mr. Crow.