Several years ago (when I had only a cheap film camera), this fellow got into our basement.  One night we heard something banging on the basement door about 1 A.M.  Not good!  I slowly opened the door and saw nothing.  Went down into the basement and there was this Screech Owl in the corner.  It took us a while to come up with a removal plan-the trusty fish net.  After several swoops around the basement we netted the little fellow and released it outside. To this day we do not know how it got into the basement.