We've gone nuts

In an effort to keep the squirrels out of the birdfeeder, we started giving them corn and peanuts. We call one "Notch" because she has a small crescent missing from one ear, probably from a fight. Notch has decided to let us know whenever we need to put out more food by coming to the back door and looking in, sometimes thumping on the door. She can be quite persistant, going from window pane to window pane in order to make sure we see her. We are extra careful never to leave the backdoor open now, for fear she would come inside and have a look around.