Steve--- We must have Tom S's robins cousin here in Omaha. For the past three years we have had a robin banging into the windows of our stick masterbath and master bedroom. We lost the big Ash tree near the masterbath due to a storm two summers ago and figured that the robin that nested in it had gone away! No such luck! This stupid bird has been back for the past two springs banging on the windows again. What I've found out is that the robins see reflections of themselves in the window and they are defending their nesting territory. I don't know where this bird is nesting now but he's driving me and the DW nuts.
We've even gotting up and thrown tennis balls at it to no avail!
Once they build their nest we have no problems again until next year!!