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Natural WorldMeet the big birds, a feathered family who have never flown a day in their lives; from ostriches to kiwis, these bizarre birds appear to be nature's greatest novelty act; how they came to be is a tale that has long captivated Sir David Attenborough.

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Now PlayingNatural WorldMeet the big birds, a feathered family who have never flown a day in their lives; from ostriches to kiwis, these bizarre birds appear to be nature's greatest novelty act; how they came to be is a tale that has long captivated Sir David Attenborough.0Natural WorldFrom hippos and their exfoliating fish friends, to ravens and their wolverine dinner dates, Bill Bailey introduces the most extraordinary partnerships in nature.