Terry, to answer your question about hibernation - First off, our falls are VERY wet and cold and respiratory infections and pneumonia are always a possibility, as are flooding burrows. Second, the current pen is on a slab. I don't have anywhere for them to be able to dig down deep enough to keep from freezing solid. Third, I don't really see any reason that they HAVE to. For my peace of mind, it works better for me knowing they are healthy and safe. Just personal preference.