The folks at the DuPage County Forest Preserve District don't come right out and say they oppose Groundhog Day. Still, they have a definitive position, and it leans toward killjoy. They don't celebrate that whimsical, pseudo-holiday of Feb. 2. The district contends that the pudgy rodents, also known as woodchucks — or whistle-pigs in the South — need uninterrupted hibernation from early November through February and into March.