They’ve been called the crop circles of the ocean floor—seven-foot
diameter patterned circles that were first spotted in 1995 off the coast
of southern Japan. But their origin was an enigma, and local divers
termed them “mystery circles.”
The mystery persisted until 2011 when the culprit, a male pufferfish
just five inches long, was finally caught in the act. And recently
scientists
Finned Diggers
The research team observed a total of 10 construction events carried
out by somewhere between 4 and 8 males. (Pufferfish don’t have very
memorable faces, apparently.) Males spent seven to nine days building
their respective circles by repeatedly swimming in and out of the
circle, using their fins to dig valleys in the sandy bottom.
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