Buy a cat.
We have a Cardinal who lives in the woods on the south side of our house. He has been trying to kill himself in the windows since we had the house built 3 years ago. Fool bird won't learn! It is crazy. We tried a fake owl and also hanging wind blowing type decorative things outside the windows, but nothing deters him. He is not afraid of Olaf the cat either.
Hey, conflicting information!
You ain't right!Spread rice on the ground and fill the bird bath w fresh water.BOOM,problem solved.
Your just jealous you didn't think of it.You ain't right!