After more than a decade of close observation, there is still no concrete evidence that crop circles are related to UFO sightings. These effects are exciting, but they do not constitute proof of UFO activity. Current theories on what causes the circles include unusual whirlwinds, electromagnetic fields, microwave energy, earth energies connected with Stonehenge, and hoaxes. Some believe that the complex shapes of many circles indicate a hoax, but the facts in each case are not so clear-cut.
Crop circles are a fascinating mystery.
Continued scientific study will undoubtedly shed light on this enigma. Controversy continues regarding the alleged connection between UFOs and the apparent mutilation of cattle. Some researchers argue that unusual circumstances surrounding the death of some cattle indicate UFO involvement. They cite reports that tell of strange lights or aircraft near fields where mutilated cattle are later found. Here again, a more systematic study and more credible evidence is necessary before a connection between UFOs and cattle mutilations can be made.