Patio next to back door, was put in slightly raised years so it comes right up to just underneath the back doorstep. There’s a thin, maybe 5cm wide strip of shingle between patio and house. I keep finding digging in the same place, with piles of gravel thrown out. I’ve had a feel and there are no holes or gaps under the slabs so I don’t think anything is actually nesting there. And no reason for that particular spot. There’s an air brick there that they’ve uncovered but it’s intact and I plan to put mesh over it. Any ideas? I’m thinking squirrel 🐿️ or rat 🐀 but open to other suggestions as to what critters we’re hosting.