Well, I tossed in a small cob and they pretty much avoided it after suspiciously looking it over. Guess I should have taken a few kernels off first so they could see what this strange object was all about. They sure do get upset with anything new or changed. Yesterday they were carrying on about their waterer and seemed afraid to walk up and take a drink. It's the same waterer in the same spot. I finally figured out that the outside light was reflecting on it a certain way and causing the anxiety. I moved it over a half foot to see if that helps. Finally, one wasn't quite so "chicken" and took a few beakfuls and the others followed.
If nobody gets brave enough to peck the corn cob, no big deal. . . . just dinner for the squirrels. THEY will know what to do with it.