Corner windows are particularly bad.

"Dr. Dan Klem of Muhlenberg College estimates that each year, in the United States alone, during migration 98 to 976 million birds fly full tilt into windows and are fatally injured.

Dr. Klem says we can minimize these collisions by breaking up the reflection on the outside of the window with a non-reflective window coating, window screens, flash tape and bird netting.

Planting trees and installing window awnings to block the sun from hitting the window may eliminate some reflection. Putting a bird feeder on or within a few feet of a window helps to slow birds down and lessen the effect of impact."

There, have I instilled enough guilt?