I have a large picture window and I hated the bird strikes. I found a cheap solution. I bought some fabric screening at Home Depot. I threaded some picture wire through one end and attached it to the outside top of the window with the wire wound around a nail at each side of the window frame at the top. I pulled the screening out to about a 30 degree angle at the bottom near the ground and held it taut with twine and tent pegs driven into the ground. The birds just bounce off. This is surprisingly less obtrusive inside than all the decals...hardly notice the screen. And it removes easily at the times of year when strikes are not a problem. Zellene