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The polar regions, North and South, are magical ice worlds inhabited by some of the most bizarre and hardy creatures on earth.
Spring in the polar regions; the greatest seasonal transformation of the planet begins with the return of the sun.
It is high summer in the polar regions, and the sun never sets; many species take advantage of the easier conditions, but summer is a tough time for the polar bear family, as their ice world melts away and the cubs take their first swimming lesson.
Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.
Polar winter brings the greatest test of survival; polar bear cubs are born tiny and blind; wolverines scavenge in deep snow; brinicles turn deadly when they reach the ocean floor.
Human survival in polar areas relies on ancient wisdom and modern science; a look at the riches and wonders of the polar regions and the people that have been visiting them for thousands of years.