Race to Survive

S1 E5: Migrations are ticking clocks: every day, countless animals must move or die, driven by changing seasons, and a changing climate; they are racing to reach their destination, before it's too late, to breed, feed or simply stay alive. From the ever-changing Arctic ice floes to the salt pans of Botswana, trillions of creatures are compelled to journey-for the sake of their own survival and their legacy. But for animals ranging from walruses to whale sharks, zebras to orangutans, pronghorn to plankton-every day is a race against time.