UFOs and UAVs: Known, Unknown, or Drone?

UFOs and UAVs: Known, Unknown, or Drone? « Mysterious Universe: "One of the persistent problems with the study of UFOs over the last several decades involves how easily misidentification of known (or at least manmade) aerial objects can occur. In addition to misidentification of “knowns,” there are also the “unknown” aircraft that are occasionally seen taking to the skies, which no doubt constitute a great number of UFO reports–if not the majority of unexplained aerial phenomenon, in truth. But someplace between the known and unknown quantities here are the ever-popular drones."