Great Migrations gives the word "move" a whole new meaning. This seven-part global programming event takes viewers around the world on the arduous journeys millions of animals undertake to ensure the survival of their species. Shot from land and air, in trees and cliff-blinds, on ice floes and underwater, the shows tell the powerful stories of many of the planet's species and their movements, while revealing new scientific insights with breathtaking high-definition clarity and emotional impact. The beauty of these stories is underscored by a new focus into these species' fragile existence and their life-and-death quest for survival in an ever-changing world. The National Geographic Great Migrations team spent two and a half years in the field, traveling 420,000 miles across 20 countries and all seven continents to bring this ambitious production to television.