He didn't know what it was, so he turned it in to the Illinois State Museum, where it's now on display. A paleontologist with the museum identified it as a neck vertebrae from a Harlan muskox.
The extinct mammal lives in Illinois during the Ice Age more than 12,000 years ago. Experts think the drought probably shifted some rocks causing the bone to float to the surface.
Copyright 2015 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.