I don't like mysteries - so who else to turn to but you good peeps!
Here is the puzzle. I live in a bijou Victorian terrace with though foundations. The soil in my front garden goes right up to the house. There is a path that runs down one side leading to the front door. The edge of the path is 'mulched' with small cobbles. A few evening back, I heard a chinking noise that sounded like the pebbles being moved. I got up and investigated, but no sign of anything and the noise stopped.
In the morning, however, there was a small tunnel about 2 inches across that went under the path where it joins the house. No 'spoil heap' on the top of the soil. I plugged it with a very big cobble. The same thing has happened every night since and each morning there is a new tunnel to be blocked up!
Any ideas about what it might be? Looks too big for mice to be doing it .... and I can't find any other clues that might help!
AC x