The mention of fox burrow brought to mind a little episode that happened this week. It happened while we were having breakfast and so quick that we didn't have time to reach for the phone or camera.
Since some (or all) of the bottom dropped out of the owl box in the field just beyond the railway and the resident Barn owls moved on. A pair of Little owls have taken up residence in the owl box.
We see them out and about quite often, mostly when one or the other (or occasionally both) are sat sun bathing in nearby trees. One of them also regularly sits on some planks which protrude off of the edge of a sheep shelter just below the owl box. While there it often poops, in the same place each time, almost as if it's a designated toilet.
From sitting there, on Monday or Tuesday morning, it flew down to the ground in the field (presumably looking for food) and after a few moments it dropped out of sight into a nearby rabbit burrow.
It got rather a nasty shock, given the speed that it suddenly popped back out, there must have been someone in residence in the hole . It stopped for a few seconds on the ground and shook itself. then it flew back into the tree.