Bluebirds banging into our windows....ugh!

http://www.sialis.org/windowstrikes.htm

William's link would have been my answer as well. I work in an office building that is mostly glass, and we have birds collide with the windows. The glass is reflecting the surroundings and your bluebirds try to fly though.

http://windowalert.com/?gclid=CMad_Laa6tACFUtNfgodudMBEQ

I used some "invisible" UV ink and a ruler and drew lines on the outside of the glass, and hung some mylar tape - this past summer - that you get for keeping birds out of trees, and that worked.

There are also bird UV decals, but you need a lot of them and they need to be no more than 2 inches apart to be effective; or you can use a UV ink blotter with them.

I researched the films that you can get; like the collidascape (complaints on the dirt getting stuck in the little hole openings) and this one which is very expensive; but I really like:

http://www.decorativefilm.com/solyx-sx-bsfh-bird-safety-film-59-or-70-wide-2

Here is something I found that is pretty, but won't work on my windows as I have window panes, I don't know where to buy it though:

http://www.ercshowcase.com/portfolio/anti-bird-strike-film-trees/

I like this one for cost and ease and plan on trying it when the temperature warms up as you can not apply it below 50 degrees:

http://shop.conveniencegroup.com/products.php?product=Feather-Friendly®-Solution-for-‘Do-it-yourself’-Residential-Applications

Whatever you use, it has to go on the outside of the glass or they still see their reflection and the sky and trees reflections.

They are not flying into the windows right? Some birds are territorial and when they see their reflection in the window they perceive a rival and will peck. Is that what is happening? If they are on the ground and pecking the bottom of the window, maybe you can put a piece of cardboard or something like that and that should stop them.

We had the same problem with robins pecking our windows. We put up solar screens and the problem stopped completely. The screens are easy to clean and don't obstruct the view.

The screens fit over the window and can be used in addition to your inside screens. I admit they may be redundant but they are effective.

It probably won't for your casement windows. But you might consider covering the glass with a non-reflecting material during the birds breeding season when they are so territorial. I wish I had another suggestion but I don't right now.

Sorry they are being pests. We had a blue bird come stay with us for several weeks. He came into the warehouse and made himself at home. He would get our attention and then fly to a sink and ask us for water. He ate lots of meals with us. He would be waiting outside a back window every morning waiting for someone to open the door for him. He left one night and did not return.....we were very sad and missed him greatly.

Now the crows that would roll rocks down our high pitch metal room.....another problem. I really think they thought it was fun and they really enjoyed watching us shout and scream at them.

If you were able to step out side the window and view the window from a distance you can see why they are flying into the glass, the reflection looks like the great outdoors, what you see is what they see and their little brains can not reason that--Thats a window! The only time that reflection will not take place is when the interior lighting is so much greater than the exterior lighting,(which is causing the reflection),that it will cause the interior of the house to appear instead of the outdoor scene. If your windows are fairly new or you've had the glass replaced with the Low-E coatings, the reflective aspect of the glass is much greater than the older versions of window glass. I have a friend who recently purchased an older home with Cedar Beveled siding that had multiple heavy layers of paint on it. The paint began to bubble in very distinct diagonal rows on the north end of his house, it bubbled from just below the soffit overhang all the way to the bottom of the siding, I tried to help him find the problem causing this,(typically moisture trying to escape, but could not come up with a cause, One sunny afternoon while he was adjusting the brown tarp cover he had on his boat, he noticed the same diagonal lines on his tarp, but they weren't bubbles they were dark lines as though they had been subjected to extreme heat. He was puzzled by this, went in the house and ate some lunch. That afternoon he went back out to re-examine the tarp and the sun had shifted enough that there were extremely bright narrow diagonal lines on the surface of the tarp,(he said it reminded him of the light you could develope with a magnifying glass while trying to burn something). He turned to see what the source of the light was, and saw the light reflecting off of the 2 new windows that had been installed in his neighbors upstairs remodel earlier that year. The glass panels seemed to have a slight concave appearance and after discussing it with his neighbors, they called out the window mftr, and the representative upon reviewing the situation promptly scheduled the glass panels to be replaced. the new panels of glass did not have the concave appearance and the problem went away.( Sorry about the Rabbit trail), If there happens to be a high concentration of insects by the windows I have had birds flying up to the windows to eat the bugs, but that is a different scenario of it's own. It sounds as though a netting hung far enough away to be able to open your windows, and yet keep the birds from crashing into the glass would be your only solution. Have you checked with the Audubon Society for any helpful advice ?