Mysterious Circles In The Grasslands Of Africa

In the meadows of southern Africa are thousands of barren land called "Circles of fairies."
They reach a size of 2 to 15 meters in diameter, and are among the vegetation. Such circles are found in Angola, South Africa and Namibia.
Biologist from Germany Norbert Juergens of the University of Hamburg, tried to prove that these phenomena are related to the activities of termites. As you know termites build fairly complex engineering structures, the professor suggested that the same termites are active underground.
But while this theory has not been confirmed, circles remain a mystery to scientists.