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From winter storms to scorching summers, seasonal seas push animals to be resourceful, adaptable and adventurous. Those who can survive these dynamic seas reap rich rewards.
Beyond the horizon lies the vast open ocean, a world teeming with extraordinary life where giant blue whales, tiny drifting crabs and tenacious turtles thrive against all odds.
A look at the surprising connections between the world's oceans, from the icy worlds of the poles to unexpected coasts closer to home.