摘要：A small puferfsh, Torquigener albomaculosus, is known to construct an elaborate geometric circular structure, which has been referred to as a “mystery circle,” with a diameter of ~2 m in the sand of the seabed . We reconstructed a 3D model of this structure for the frst time using a “structure from motion” (SfM) algorithm . The mystery circle constructed by the puferfsh may have potential applications for biomimetics similar to the structures constructed by termites and prairie dogs . To support the signifcance of its structural characteristics, it was observed that the water passing through the valley upstream always gathers in the center of the structure, regardless of the direction of water fow. Furthermore, it has the function of extracting fne-grained sand particles from the valleys and directing these to the center. Computational fuid analysis can be performed immediately using the quantifed 3D data, and the structural features of the mystery circle is expected to be applied in a wide range of felds, such as architecture and engineering, via biomimetics .
