This video is called “Fairy Circle” Mystery Possibly Solved in Africa.
Some people believed that aliens from outer space caused these circles.
From Scientific American:
Mysterious Desert “Fairy Circles” Caused by Termites
The Namib Desert‘s strange circular patches of grass with bare centers are the result of termites establishing reservoirs. Sophie Bushwick reports
In southwestern Africa’s Namib desert, the lack of rainfall keeps grass sparse. But in some areas, mysterious rings of grass with bare centers appear and thrive. Now scientists have discovered these so-called fairy circles are indeed created by wee little creatures—termites. The work is in the journal Science. [Norbert Juergens, The Biological Underpinnings of Namib Desert Fairy Circles]
Many organisms live in and around fairy circles, which range from one to 50 meters in diameter and persist for decades. But scientists found only one species consistently inhabiting even the youngest fairy circles. The sand termite Psammotermes allocerus is thus the most likely culprit behind the rings.
How do termites make fairy circles? Living grass sucks up rainfall and loses the liquid to evaporation. But when termites cluster together, feeding on and destroying vegetation, they leave a roughly circular bare patch that stores more water than the surrounding soil. The fairy circle thus acts as a water reservoir for the sand termites, the grasses around the edge and other thirsty organisms.
So maybe we should start calling these rings “termite circles.” Nah—sounds a bit wooden.
Termites may be “pretty” in the eyes of a scientist, but don’t let good looks fool you: The prettier termites are more destructive than their uglier counterparts, a researcher says: here.
Fairy circles are round gaps in arid grassland that are distributed very uniformly over the landscape and only occur along the Namib Desert in southern Africa and in parts of Australia. Scientists have got to the bottom of this with soil investigations and drones. The results suggest Australian fairy circles were caused by processes like the weathering of the soil by heavy rainfall, extreme heat and evaporation: here.
- Scientist Says Sand Termites Behind Desert Fairy Circles (sciencespacerobots.com)
- Termites are the ‘fairies’ behind weird desert rings (newscientist.com)
- News in Brief: Termites, not fairies, cause plant circles in African deserts (sciencenews.org)
- Africa’s Mysterious “Fairy Circles” Explained (newswatch.nationalgeographic.com)
- Small termites create huge ‘fairy circles’ in the Namib Desert – Los Angeles Times (latimes.com)
- Image Gallery: Amazing ‘Fairy Circles’ of the Namib Desert (livescience.com)