What do you think did this? It looks a bit odd doesnt it perhaps like a load of tumble drier lint in a pot hole? No what this looks like to me is the nursery chamber of a rabbit warren that's been dug to by a badger. All the fluff is rabbit hair that doe rabbits line their warrens with when they have young and the digging is a badgers handiwork for sure, claw marks and its vicinity to a very active badger sett give it away.
So badgers aren't as cute and cuddly as you might suppose. Beatrix Potter was right about Mr. Tommy Brock wasn't she.