Bird tracks on the window

There has been a cardinal flying into our window for the past few days. It doesn't hit the window hard, it looks like he is flying up to spar with his reflection. He gets on a roll at times and hits the window about 30 times in a minute. A neighbor told us that he had the same thing going on, so he went out and shot it with a 12 gauge. That was pretty radical.

We're just going to let him wear himself out. The problem is that with all of the rain and moisture lately, our window is a mess. We'll wait until he no longer does it to clean the window.

Bird tracks on the window