In my new back garden, there's a large hole (15-20cm across) and my mum suggested that it could be rats - bummer. I've never seen a rat but saw a family of foxes go through the garden a week or so ago and as my fence panel is always pushed to one side, i gather they travel through quite a lot, but they didn't go into the hole.

Could this be a fox hole do you think, or is it more likely to be an army of really sneaky rats?