[Stefan-A]

So nothing in their habits or requirements would actually prevent you from successfully breeding them as food for snakes? It would be interesting to give it a shot. Myodes (Clethrionomys) glareolus, which is extremely common, is a pretty impressive breeder.

Local legislation prohibits taking wild mammals and birds as pets though. You can kill voles all you want, but you can't keep them. That's a law I wouldn't want to break, you might get banned from keeping pets altogether.