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Over millions of years of evolution, penguins have gained the ability to survive the frigid South Pole, to live in water for months and to dive to depths of up to 300 meters -- but these adaptive skills came at a price. Unable to fly, forced to conform to a complex social pecking order and subject to grueling migration rituals, penguins have a unique story in the world of birds -- a story told in fascinating detail in this absorbing documentary.