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Great Migrations: Born to Move

Born to Move
In the premiere hour of Great Migrations, witness the dramatic migration of Christmas Island's red crabs as they travel from interior forests to mate on the beaches, braving battles with ferocious yellow ants; the heartbreaking moment a wildebeest calf falls prey to crocodiles, all part of the 300-mile journey the wildebeest make each year; the monarch butterfly's annual journey that takes four generations to complete; and the sperm whale, who may travel more than a million miles in a lifetime.