(Cambridge, Ontario, Canada)
I have had this male Cardinal for two months now hit my bedroom window from about 7 a.m. till dusk.
I was told he saw himself and was chasing himself away, so I put up cardboard on outside of window to stop him.
It didn't work, he started hitting the screen side. Discovered it is not himself he is chasing away but trying to get my cats attention.
When the cat goes to the window he flies up and down it outside while the cat follows his moves on the inside.
He sits and chirps until the cat appears and they start playing their crazy game.
It is quite cute, weird and amusing.Just when you think you've heard it all .....