Man you know how to PARTY!
I spent a long day under my old house digging a trench under the AC vent lines to get access to the kitchen area of the house. I saw a lot of strange turds down there. I think they were coon droppings. I did a very solid job of sealing up the vents.
I am happy to have a house on a concrete slab now.
Hopefully you have cured your problem.
