Funny chicken behavior. You know you shake a bag of cat food and the cats come running? I've got chickens that come running at the sound of cat food. Helen, my barred rock, will actually work her way up in the middle of everything and if the cats wont move, peck the cats and make them run away (the cats are scarred of the chickens to start with, so this doesn't help). I've had to start feeding the cats after dark to keep them from getting attacked.