Scientists Released a Robotic Crab Among Thousands—Then the Unexpected Occurred

Then, without warning, the crabs started to cluster. It looked chaotic at first—a tangled heap of legs and shells piling on top of each other. Instead of fleeing, they formed a dense, living mound across the seabed. To an observer, it seemed like panic. But the longer the scientists watched, the more it looked like a coordinated, deliberate action.