On a glorious July afternoon, the big fish swims toward us, its signature dorsal fin slicing the water. The great white shark measures 12 feet, maybe more. Its jaws snap shut on 300 pounds of seal. "We have predation," says the guide on my shark-viewing excursion. The attack leaves behind a gory red plume, the money moment in a bloody good business.Shark tourism generates more than $300 million a year in places such as Australia, the Bahamas,and New Zealand. But I'm on Cape Cod, the Massachusetts seaside destination where growing numbers of great whites have taken to summering over the past decade. They come for the cuisine: tens of thousands of gray seals lazing in the coastal surf. It's a conservation success story, the result of decades of federal and state laws protecting both predator and prey.
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