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As the North starts to face the sun, the great melt begins, and there's a baby boom. But for penguins and foxes in the South, conditions are getting harsher.
Stephen Fry explores how nearly all life on Earth is impacted by our annual journey around the sun. Northern winters bring notably harsh conditions for polar bears, for example.
Summer can be extreme. In The Rockies, summers are short. Pika must harvest flowers to eat before the snow returns. For Marion Island's king penguin chicks, life has frozen still.