Puffer fish crop circles. Well, sand circles actually.

[Magda Hassan]

Right around this time last year, news broke about the discovery of an amazing little puffer fish capable of creating elaborately designed crop circles' at the bottom of the ocean as part of an elaborate mating ritual. The behavior was first documented by a photographer named Yoji Ookata who later returned with a film crew from the Japanese nature show NHK which later aired an episode about the fish.
Even as articles bounced around the web it was still difficult to imagine how a tiny fish could create such a large design in the sand, even when staring directly at photographic evidence. Finally, video has emerged that shows just how the little guy delicately traverses the sand in a rotating criss-cross pattern to create a sort of subaquatic spirograph. The textured sand sculpture not only attracts mates but also serves as protection when the fish pair and lays eggs. (via The Awesomer)