The ultimate hole just happened to be off a path that was conveniently at hole-level in the tree, big hole out of which came a photo-worthy raccoon. At first fluff-ball looked around and returned to the hole. The tree is hollowed out, a second hole further down allowing visibility to the outside world, also good ventilation. When Coon returned to den I walked on. An hour later I checked again. Coon was out ready to pose.
People walked by on this path and never even noticed the raccoon. Its colors perfectly match the park colors of winter.