Have you actually caught them red-pawed? It was quite by accident that I found it was voles and not chipmunks when I saw a vole in the act of absconding with a marigold plant. I sat and watched as it hid the mariold under a juniper and came back for another one. I'd wondered why bits of wilted plants were accumulating under junipers, in daylilies etc. I have seen chipmunks bite off petunia and daisy flowers I must admit, but never suspected it was voles doing most of the damage until I saw it. The chipmunks were always visible but not the voles. Neither is easy to deter.
