They've been hauling sand like crazy

I wonder why? The stockpile we walk by has grown noticeably. A semi would look pretty small on that sand mountain now. And the road looks like a beach. In places it's tough to walk on. Tonight I had to dump the sand and stones out of my shoes at least ten times. During one stop I noticed a new hole in the little sand pile that's well off to the side of the main one. By little I mean it's about the size of four school buses if you stood them on end. I don't know why they left that pile there. Anyway, a few years ago a pair of kingfishers burrowed into its wall and nested for a while. I don't think things worked out. This year the hole became larger. Another hole appeared. And paths leading to the holes appeared and deepened. On a windy evening this spring we startled a fox on its way to the main hole. It didn't look too scared, but it wasn't friendly either. Not like some. We look for it now, but don't expect to ever see it again. Signs of activity will do. Like this new hole. How many ways in and out does one need? And it seems small. Incomplete. Or maybe from where I was standing I couldn't see the entire opening.