They were called “underwater crop circles,” as their intricate geometry conjures the idea of the familiar crop circles that we all know. The baffling aspect was that these were truly happening on their own in nature and could not be explained. That is until recently when scientists finally caught male pufferfish in the act off the coast of Japan.
Apparently the male pufferfish spends seven to nine days carrying out a meticulous excavation process in which he creates a seven foot diameter spirograph pattern — all by using his fins to create a perfect breeding ground that will attract a mate. The puffer fish will even go through the effort to adorn and decorate the design with sea shells and coral fragments.