This amazing species makes incredible underwater art, out of sand! It was a mystery for a long time, nobody knew who was making these weird pop-up underwater crop-circle things, and then we finally discovered that a tiny pufferfish is behind them. But this has lead to more mysteries: How to they do it? And why? Dive into the waters off the coast of Japan on this episode of Species.
Here's an awesome video of this creature making their fantastic creation:
Here are some photos of them: