Noticed freshly dug earth beneath the bricks that support the nest boxes that protrude from the back side of the house. Went and removed the ramp up to the boxes. The tunneler has gained access to the house and there was tunneling about 3-4" in diameter the was about 3-4" deep. With long sxrewdriver in one hand and pistol in the other I probed and think I've destroyed the tunnel system. The house has 23 pullets about 5 months old and a mature rooster and no chicken loss. Dont think any are laying - at least havent seen an egg but suppose the "visitor" could beeating any early eggs. My question is what could this be. I know I have snakes but have rats too so im willing feed the king snakes a few eggs in return for some rat controlm..I take em outta the chicken hoyse and relocate em to the barn. So what do y'all think I'm dealing with and how do I eliminate it.