Poor thing??????Ah man, you are not one of those people........ Voles are pretty much in the same game as moles, gophers, and other mammals/rodents. There is a new harmless gas going to be on the market for the homeowner to be put down in the hole, and it becomes a concusion gas for the underground varmint. I forget what it is called, but look out for it. The other thing that I have done is taken a small plastic bottle, thin like a small coke bottle, and used dry ice and warm water. I put the dry ice in, with the warm water, put the cap on tight, and put it down any available tunnel system of hole, and cover it. Plug your ears, because it will be loud. This has been successful for me, especially around piping and gardens. Just make sure you don't have grumpy neighbors that will complian about the noise. Good luck.