I was trenching around my house to install some corrugated drain pipe and I ran into the weirdest thing. At the bottom of the trench about 10-inches down, there was roughly a 2-inch hole going into the side of the trench. I took the end of my wooden shovel and stuck it in, and it went in about 2 feet semi-horizontally. Then I came in from a more vertical angle and was able to poke down about 2 feet in that direction. It was tunneling, not a giant hole. The ground is all compacted red clay so I'm very curious what is living in those tunnels. I don't have any issues with pests and I've never seen any entrance holes. Thoughts???

