my grand dad always tapped a quarter againt the stock of his gun. sounds like a squirrel chipping nuts?

rub two nickles together it gives the sound of a squirrel clucking

just be still and whistle. short burst high pitched whistles. they arent overly smart and are very curious, i do it when im bored deer hunting in my stand. if your still enough, the will come within a few feet. (by the way it doesnt spook deer....if you do it right )