Originally Posted by Bestwifeever
This (it would scare me):
I got one of those owls to try to keep the turkey vultures off my deck. I used a clamp to mount it to my deck rail. I also got this to hang in front of the windows: Amazon.com: In the Breeze Eagle Twister: Patio, Lawn & Garden
So far they are working pretty well, but I have had a couple of visits. But as a bonus, it seems like the occasional bird that used to fly into my window has stopped. Or maybe it stopped last year when I put 3M window tinting on, to reduce the glare and heat of the sun. It probably also reduced the reflectiveness and no longer looks like the sky and another bird.
The one problem with the eagle twister is the hard plastic ball at the bottom, which I'm sure is needed as a weight. It bangs against the window in a heavy wind. I taped a finger of an old ski glove on it to dampen the noise.
I've also heard of netting as a solution. The birds either see the netting and don't fly in, and/or you pull it tight and a bit away from the window and they hit that softly and bounce out.