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They flip sharks upside down so they can tear out their nutritious liver... The ocean's 9 most powerful, ruthless killers that rule the waves

Here are 10 of the most effective predators in the ocean – and you might be surprised which one comes out on top ...
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They dived a wreck surrounded by fish - then sea lions, electric rays and whale sharks turned the trip into something else

Jonathan and Christine travel to La Paz to explore the Sea of Cortez, the 700-mile body of water Jacques Cousteau famously ...