VIDEO: School's out

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In the ocean, schools of small fish bunch together as a means of survival.

These "bait balls," however, attract swarms of predators — bigger fish, sharks, whales, even hungry seabirds that dive-bomb below the surface.

National Geographic recently had a video crew off South Africa and captured some amazing footage of the marine world’s life-cycle drama.

Read about South Africa's marine habitats — and the challenge of protecting them — online in National Geographic magazine.