Curtain Heading Tape Does Anyone Know How To Stop A Cardinal From Smashing Into My Window?

Does anyone know how to stop a Cardinal from smashing into my window? - curtain heading tape

I have a husband who is the proprietor of the cardinal at my window flew open. He must see his reflection and think, is to defend his territory. I have tried to close the curtains to make a giant photo of an owl and scary. But over the past two years, everyday smells head on the window again and again. I do not want to kill him (I'm surprised he has not killed). Ideas?