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Circles like the one above were first discovered off the coast of Japan in 1995, but it wasn’t until very recently that scientists got an explanation for them. It seems that male pufferfish painstakingly designs these elaborate circles in the hopes of attracting a female to mate. If the male is successful, the two mate in the middle of the circle; the female will also lay her eggs in the middle of this circle later on. The ridges in the design serve to protect the eggs from predators and currents.