Either Field Mice, or Rabbits is my vote. Most likely rabbits - have you seen any around?

Last year I had a momma rabbit go and make a nest like you are describing not 10 feet from my back door, right in my lawn :)

It was adorable watching the babies grow up, and momma come feed them every night..... the only annoying part is I couldn't mow the lawn for a month for fear of running them over if they moved around and I didn't see them!

May be a rabbit. You don't want 4-6 rabbits having a very short commute between safety and dinner, despite the fact that they may attract Bambi and Thumper.

Dan

If its a rabbit as it sounds like, what's my best option of what to do?

Make it leave or kill it, whatever your moral compass sez is best. Many ways to make it leave, all involve making it known the hole isn't safe.

Dan

Yes, bury the hole and the bunny will look elsewhere else to nest. May be time to put up some garden protection as the bunnies will come back to feed.

Rachel
Graphic Muse's Garden Spot

I'd guess rabbits too. They keep digging in my garden this year. I had doubts at first it was bunnies b/c the very tiny lettuce starts in the be were all intact but in a later incident, they made more of a bunny shaped hole and they are the most prolific creatures out here. They've dug in mine 4 or 5 times. They wait a couple weeks then find some more newly sprouted beans to dig in. Soon, I think everything will be big enough to handle them.

Here is a link that might be useful: Tales of a Transplanted Gardener