fairy ring n. a naturally occurring ground circle caused by fungi or other biological agents; figuratively, a fanciful ring or circle of mystical or unusual behavior or action. (source: Double-Tongued Dictionary)
Further reading
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...
Huge feral pigs are eating their way across northern Canada, and building themselves shelters in the snow. Researchers call these structures pigloos. This is part of a complete episode. Transcript of “Pigloo” Feral pigs can grow up to 600 pounds and...