Fish often travel in schools. Their mesmerizing action can appear choreographed and rehearsed as these schools bend and break in perfect timing. But there actually is no choreographer. Each fish navigates on its own. How and why each fish does what it does is what makes their schooling so puzzling to scientists. Now scientists think they have a clue as to why schooling is so common. It saves the fish energy — lots of energy.

Hundreds to thousands of fish can school together. Sometimes they move slowly and gracefully. Other times, they will dart quickly in one direction, then another.

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