What are these large smooth tunnels?

[schism]

I've happened upon two large underground tunnels while digging. The first was a foot under the surface and approximately 2" in diameter with perfectly smooth sides. I thought it may have been a pipe that rusted away. But now I've discovered another. It was below a large paver and 1 and 1/4" in diameter--again perfectly smooth and round. There was a bit of mud dried mud at the edges and a small (2") shallow cavity beside the hole. Could this be a frog? I don't have moles or voles. Weird.

[The Helpful Gardener]

Bit outside my regular haunts, although two inches is AWFUL big for frogs...

I'd contact your local extension service (usually at your state university); they'll have a much better idea than I...

Scott

[Newt]

Hi Schism,

I agree with Scott that contacting your local extension service might be your best option. I do know that there are some type of crab in your area that could be the culprit. Take a look here for your extension service.

https://www.lsuagcenter.com/nav/extension/extension.asp

Do let us know if you find out what it is.
Newt

[schism]

Hi Scott and Newt,

Thanks for the advice. LSU Ag has been helpful with ID of termites....those dreaded formosans. (Here, it's not a matter of IF you have them it's WHEN you'll get them) I'll give see if they have any ideas. Not worried, just curious.

Sandy

[The Helpful Gardener]

I've heard that's a big issue for your area; knock on wood they don't make it here...

Invasive species strike again

Scott

[Newt]

Sandy, you made me curious so I put 'formosan termite' in the search box at www.google.com and found this site.

https://www.agctr.lsu.edu/termites/

Good luck,
Newt