Beware of the birds

This is one of the windows in the back of my house. Do you see the white splotches? They are smudges from birds. Ever since the hurricane came, birds have been flying into my windows. Some knock themselves out, some die, some bounce off and fly away. It's not a pretty sight sometimes. We can't figure out what it going on. I have solar shades on some of my windows and nothing on the others. It makes no difference, they come crashing at all hours. Strange.