I'm thinking mice or voles.

This is not good, is it?

I'm not familiar with voles, but I think they eat alot of roots. I have problems with mice eating my seed before it's even sprouted. If you don't see damage anywhere, I wouldn't worry about it. Do you have a cat you could encourage to spend more time in your garden??

I blame all those holes on squirrels. I know I have voles, but very rarely see them come above ground. Lots of chipmunks in previous years, but haven't seen a single one this year.

Bobkat,
do you think the squirrels are burying nuts?, or is it a more perfect hole?

I have not seen a squirrel, nor heard one chattering away in over two years here! My powers of observations aren't the greatest, but yathink I woulda noticed at least one of them? I just saw a hummingbird this morning for a brief period. I see other birds, have lots of dragonflys and spiders and ladybugs, bees, little lizards and so forth. The two holes tht I can now find are 2" x 1-1/4".

Hi Bob,
How about chipmunks?