05 两极之间 From Pole To Pole

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In Japan, the arrival of the cherry blossom announces the beginning of spring.

The sun's energy brings colour to the landscape.

The earth, as it makes its annual journey around the sun, spins on a tilted axis.

And it's this tilt that creates the seasons.

The advance of the seasons brings constant change.

As the sun's influence diminishes in the north, so the deciduous forests of America begin to shut down, losing their leaves in preparation for the dark cold months ahead.

One season hands over to another.

Some organisms thrive on decay, but most must make special preparations for winter and a life with little sun.

Whole populations of animals are now forced to travel great distances in pursuit of food and warmth.

300,000 Baikal teal gather to escape from the Siberian winter by migrating south to Korea.

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