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All along the coasts of Scandinavia, the winds are growing cooler and stronger exerting their pull on the land, altering its very shape.
斯堪的納維亞海岸全線風越來越涼、越來越強無情地撕扯著大地改變著其本來面貌。
As the land cools more quickly than the ocean, fogs fall signalling the onset of winter.
因為陸地比海洋冷得更快，霧籠罩下來標志著冬天的降臨。
The change of seasons also cues the start of migrations.
季節的更替也給出了開始遷徙的信號。
In Denmark, these starlings are on their way south to Britain.
在丹麥，椋鳥正在南下英國的途中。
When startled by birds of prey, the entire flock erupts moving as one.
受到食肉鳥的驚嚇，整個鳥群突然起飛整體移動。
Each starling tries to stay close to its neighbors and mimic their moves.
每只椋鳥都盡量緊挨著鄰居模仿其動作。
The resulting black swarm confuses predators.
這樣一大群鳥就如烏云一般令掠食者迷惑。
Birds at the edge of the swarm are most vulnerable, so they constantly swap places to limit their exposure.
外圍的鳥最易受攻擊，因此它們不停地換位置，以減少暴露在外的機會。
The starling migration is just one part of a mass exodus of animals heading south to avoid another ferocious winter.
椋鳥遷徙只是大批動物遷徙的一部分，它們不約而同向南躲避又一個殘酷的冬季。
Animals that stay must be ready.
而留下的動物則必須做好充分準備。
Only the toughest will survive the next six months.
只有最頑強的才能挺過接下來的六個月。
