Funny true story, I put up a bird feeder-house window. All pretty birds came. Then the squirrel came up the window and knocked down the bird food. Every day. I gave up. The birds came to the door chirping for food. I bought some critter food at Food Lion for the squirrels put it by the tree & the deck. The blue jays like the critter food, no more squirrel problem, and the birds are happy. Seems they don't like corn.
Thank you to webshot member for this and all her other incredible photos of blue jays. This is the link: