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No cattle could survive here. So for centuries, reindeer has been domesticated by Scandinavia's only indigenous people - the Saami.
牛群無法在此生存，所以幾個世紀以來，斯堪的納維亞地區唯一的本地居民一薩米人，始終在馴養馴鹿。
The Saami have adopted some modern technologies, but reindeer remain in the heart of every aspect of life.
盡管薩米人如今也采用了一些現代科技，但馴鹿仍然在他們各方面生活中處于核心地位。
They've relied on the reindeer for the last ten thousand years.
他們己經依靠馴鹿生活了一萬年。
They are Europe's last remaining nomads and building a life around the reindeer's migration has made living in the tundra viable.
它們是如今歐洲僅存的最后一個游牧民族，而利用馴鹿遷徙建立的生活方式使得在苔原上生活變為可能。
The Saami use the reindeer for everything, from food and clothing to the tents they live in.
薩米人利用馴鹿做各種東西，從食物和衣著到他們居住的帳篷。
Even domesticated reindeer migrate and food is not the only reason they're heading north.
即使被馴化的馴鹿也會遷徙，而食物并不是它們向北遷徙的唯一原因。
It's their natural urge to give birth in the land where they themselves were born that drives the herd northwards into the harsh conditions of the tundra.
要在它們自己的出生地繁衍后代的自然本能驅使著馴鹿群向北進入環境惡劣的苔原地帶。
Following the reindeer's natural migration route is what allows the Saami to live this far north.
跟隨馴鹿的自然遷徙路徑是薩米人得以在如此極北部的地區生存的訣竅。
But the journey made by the wild reindeer with the North American tundra is on the different scale.
然而北美洲苔原上野生馴鹿群的遷徙之旅規模上卻是截然不同的。
Over three million wild reindeer migrate across the tundra.
超過三百萬頭的野生馴鹿加入到穿越苔原的遷徙之旅。
This herd of over one hundred thousand makes the longest migration of any land animal.
這群十萬之眾的馴鹿遷徙的旅程是所有陸地動物中最長的。
Known as the porcupine herd, each year, they travel up to five thousand kilometers.
它們被稱為格蘭特馴鹿，每年要遷徙長達五千公里的路程。
Once they leave the shelter of the trees, the reindeer are more vulnerable to predators.
馴鹿們一旦離開了樹林的庇護就更容身遭到掠食者的攻擊。
But they can run at speeds up to eighty kilometers an hour.
不過它們的奔跑速度可達每小時八十公里。
The reindeer is also one of the only mammals on the planet that can see ultraviolet light.
馴鹿還是為數不多的能看到紫外線的哺乳動物之一。
And in the tundra, that means the fur of any predator appears black against the landscape.
而在苔原上，這就意味著任何掠食者的毛皮在環境映襯下都顯現為黑色。
The abundance of reindeer attracts one of the deadliest killers on the planet - the gray wolf.
數量眾多的馴鹿吸引了一種地球上最致命的掠食者-灰狼。
