Could you have caught moles in the traps instead of voles? I don't know of any underground tunnelers except for these two critters.

Good luck at eradicating them, whatever they are!

Well, today I caught another one, looks like a baby either mouse or rat, smaller than the previous 2, not a vole. No, it's not a mole, I've handled plenty of them, they have wonderful dense fur and clawed shovels for hands, so cute, I had trouble killing them until they started really making a lot of mounds. They like it when I dig holes and loosen the soil so they come up next to my tomato plants with their holes, but putting a dead animal in the top will stop them.:-)

I'm wondering somewhat if the mousy thing is living in the voles' tunnels or sneaks in under the container to lick the peanut butter off and gets caught. Voles are very hard to catch in traps. I've stomped a few when encountering them on top of the ground...

At least some of my pole beans planted in vole territory are coming up. I stopped making a trench and just made tiny holes enough to cover each individual bean, sprinkled it with cayenne pepper, and put a 5" nail next to it. Even then the tunnels are going everywhere under the ground. Moles have deeper tunnels and push the dirt out into mounds, these are just under the surface and raise the ground over them. But if I don't want all the vines nipped off, I still need to reduce the numbers or kill them.