There have been abundant theories on the origin of the circles, reports London’s newspaper The Daily Telegraph, including “termite activity, poisoning from toxic indigenous plants, contamination from radioactive minerals and even ostrich dust baths. ”
لذلك ،‏ غرز الباحثون سنة ١٩٧٨ اوتادا معدنية في مراكز بعض الدوائر لوسمها .‏