Killer Whale

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 The most complex marine species on the planet, our counterparts in the sea, is the orca, the ruler of the ocean. Orcas, also called killer whales, are the most widely distributed marine mammal in the world -- their realm extends from the Arctic to the Antarctic. They number fewer than 100,000 worldwide, and learning more about them is a global endeavor for Jean-Michel Cousteau and his team of explorers, who travel to both the Northern and Southern hemispheres as they seek out killer whales in the Atlantic and Pacific oceans.