Survive in The Harsh Winter

Recently, there are more and more human activities on Earth, harming the environment with global warming. Some birds which cannot tolerate such harsh condition would die directly; some would make an effort to survive, to give an example, the polar birds. The environment would not change, yet the birds would never give up for the living. They choose to change themselves, doing their best by their own way, and they would always fight for survival.

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