Mystery Circle
The "mystery circle" is constructed by a small male puffer fish on sandy bottoms for reproduction. Outline of the mystery circle and behavior of the puffer fish are described at PUBLISCIZE.
publiscize.com/scinopsis/pufferfish-unique-reproductive-b...
See detail Kawase et al. 2013 and 2015.
www.nature.com/articles/srep02106
www.ingentaconnect.com/content/umrsmas/bullmar/2014/00000...
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