Who's Been Digging in My Garden?

The big question and mystery for me has been who or what has been digging in my garden.  About once or twice a week I walk outside to find freshly dug holes in the garden.  This wasn't a problem last year and I can't figure out why it is this year.  The holes are only in the old garden.  It has dug up my newly planted parsnip bed once after the seeds were sown and once as the seedlings have been coming in, which definitely will affect my yields.  The only other casualty was a marigold.  Even though they have for the most part spared my plants it's still frustrating and annoying.

These are just some of the holes that have been dug.  They don't look like that big of a deal in the photos but I find it really frustrating.