For a couple of decades I've been using pieces of FOST (fluorescent orange surveyors tape) and other tapes/stickers on my windows to try to prevent window strikes. I also place my feeders in such a way that if birds are spooked off the feeders they will not fly into the windows. Here is another idea a friend passed along, using a highlighter pen to make a grid on your window: http://youtu.be/c1u3auWG9qc Sometimes no matter what precautions you take a bird will still hit your window, but it's good to have another tool in the toolkit. Lori Markoff Eugene