In shallow coastal waters, a male pufferfish performs one of nature’s most astonishing engineering feats—constructing a large, perfectly symmetrical sand pattern on the seafloor to attract a female. Using only his fins, the fish sculpts ridges and valleys arranged in precise radial geometry, often over several days. The structure isn’t just beautiful—it’s functional. The ridges channel ocean currents to concentrate fine sand at the center, creating an ideal nesting site for eggs. Scientists have
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