Read this article about the work of termites in Africa!
"The reddish barren spots, thousands of them, are called fairy circles,
the name itself an invitation to try to solve the mystery of their
origins. They dot a narrow belt of desert stretching from Angola through
Namibia into northern South Africa. For no obvious reason, the round
patches of sandy soil interrupt the arid grassland, like a spreading
blight on the land"
"New research may now have yielded a more credible explanation for the
fairy circles as examples of natural ecosystem engineering by a
particular species of sand termites, Psammotermes allocerus. A German
scientist reported on Thursday that most likely these industrious
termites were the agents for making much of their desert home an oasis
of permanent grassland"
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