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• Angry birds — Crowded Skies

  Duration: 2:09

• The fastest courtship display on Earth — Crowded Skies

  Duration: 2:54

• The secrets of flocking starlings revealed — Crowded Skies

  Duration: 1:57

• Web exclusive: How computer graphics reveal invisible forces — Masters of the Sky

  Duration: 2:09
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• In pictures... — Crowded Skies

• In pictures... — Masters of the Sky

• In pictures... — Defying Gravity