The GARDENA gardening expert
Dear Ms. G., I'd love to help you out, but without seeing the damage, it is difficult. Could you possibly send me photographs so that I can gain an impression of the situation for myself? What do you mean by “dug from above”?
If something has dug around only in the topsoil of the bed, forming a flat depression, then this could be cats or wild rabbits.
Can you see toothmarks on the eaten plants? In this way you might be able to see whether mice or rabbits have eaten them.
Root voles do indeed work “from below” by burrowing vertically oval tunnels (moles burrow horizontally oval tunnels).
In this way they reach the roots of plants and eat them. You can put snap traps baited with carrots, for example, down into these tunnels to catch root voles.