Gene, it is probably squirrels! They eat the heart out of the corn, and leave the rest!
Don't worry about the "holier-than-thou's! If its legal, you are hunting just as much as anyone else! Its getting to the point that hunters can't get a legitimate question asked here, without being torn apart by the wolves!
I hunt by the legal rules of my state, and sleep very well at night! If some folks don't like that, they can KMA!