This is not paranormal or Bigfoot made however nothing goes to waste in the forest.It is possible that the tree was very weak and something pushed it over thus creating this den. These creatures of the forest will do anything they can to assure there survival. One can imagine just looking at this that any animal could hide up under here awaiting its next meal even a hungry mountain lion. Perhaps the tree become hollowed out in this area due to termites and extreme weather causing it to fall. No less we must look at both sides of the spectrum that is the basis of all research.