Is it a vole hole?

Alice must've put out the welcome mat in our garden.

The only vertebrate problem we've ever had are our 2 small dogs (the dachshund especially liked my tulip bed!), but a mean face and a good yelling at usually cured them of excavating and rolling in horse manure fertilizer. This year the problem looks like deep tunnels, approximately 2 inches in diameter, but I have yet to see what is making itself at home under my radish bed. I stuck a weeding tool to block one of the entry/exits but within a few hours another hole had been dug less than a foot away (and of course I was not there to see the culprit).

Garden update:
The welcome (or unwelcome) surprise this spring has been unusually warm temperatures. It jumped from 17°C to mid-20's in a day, and last week the highs were in the upper 20°C's at our altitude (700 m.s.l.). The lettuce took a beating, and so did the pea plants even if I have them in partial shade. All of the tomatoes, on the other hand, are in their environment with the heat and most of them are planted out. Corn, bittermelon, sweet melons, pole beans and sicilian serpent squash are going into the ground at the end of the month. If it continues to be hot like this I suppose harvest season will come sooner than we normally experience it.

The herbs will have their own new digs!

I've always wanted a little garden space dedicated solely to herbs, but this goes beyond what I could've ever imagined. What was once a playground for weeds is now dubbed the "Herb Hotel". A section of the garden slope was subject to erosion during heavy rains, so my husband built this low retaining wall with enough surface area to tuck in a few flavoring essentials. More growing space equals more new purchases from the nursery, and I picked up peppermint, thyme and nepitella (bottom right), a wild type of mint used in italian cuisine. That just started the ball rolling, and into the cart went a lavender bush, a rhubarb and 3 small pots of aubrieta deltoidea. I'll put up a photo of the finished project later.