Three years in the making and from award-winning National Geographic cinematographers, Great Migrations 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, Great Migrations tells the formidable, powerful stories of many of the planet's species and their movements, while revealing new scientific insights with breathtaking high-definition clarity. Narrated by Stephen Fry.