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In the northerly reaches of the boreal forest, a strange phenomenon illuminates the night sky.
在北方森林的北部，一種奇怪的現(xiàn)象照亮了夜空。
The Aurora borealis.
北極光。
Electrically charged particles from the sun collide with the Earth's atmosphere, creating this otherworldly display.
來自太陽的帶電粒子與地球大氣層摩擦，創(chuàng)造了這個超凡脫俗的光影展示。
Viewed from space, the aurora brings light to the frozen poles, which otherwise would remain in darkness for almost three months.
從空中鳥瞰，極光為冰凍的兩極帶來光明，否則極地將在黑暗中停留近三個月。
This is the Arctic tundra, where temperatures can fall to -50 degrees Celsius.
這是北極苔原，溫度可能會降至零下50攝氏度。
With little or no shelter, few animals can survive the winter here. But some do.
幾乎沒有庇護(hù)所，很少有動物能在這里過冬。但有些動物能夠做到。
Muskox. Relics from the last ice age.
麝牛。上一個冰河時代的遺跡。
Two layers of fur protect them from temperatures of -30 degrees.
兩層毛發(fā)能夠保護(hù)它們免受零下30度的酷寒傷害。
This allows them to give birth in early spring.
這使麝牛可以在早春分娩
At six hours old, a calf is already able to stand, ready to follow the herd in the search for fresh grazing.
出生六小時的小牛已經(jīng)能夠站立，準(zhǔn)備跟隨牛群尋找新鮮的牧草。
But until they gain in strength, they are very vulnerable.
但在獲得力量之前，小牛非常脆弱。
They're being stalked. Grizzly bears.
牛群正在被跟蹤。一只灰熊。
Weighing up to 300kg, they have emerged after six months of hibernation, and are extremely hungry.
體重達(dá)300公斤，它們在冬眠六個月后出來了，而且非常餓。
One gets to within just ten metres, and then attacks.
一只熊就在十米之內(nèi)，然后攻擊。
Separated from their mothers, the newly born are unable to distinguish friend from foe.
小牛與母親分離，剛出生的小牛分不清是朋友，還是敵人。
The bear instinctively kills every calf it can. Only a few escape.
熊本能地殺死了它可以殺死的每一頭動物。只有少數(shù)小牛能夠逃脫。
But the herd is now far away, and he is too weak to follow.
但是現(xiàn)在牛群已經(jīng)走遠(yuǎn)了，它太虛弱了，無法跟隨。
90% of calves do not survive their first year.
90%的小牛活不過第一年。
Even one without injury stands little chance without its mother. Reunited.
即使沒有受傷的小牛，如果沒有母親，也幾乎沒有生存機(jī)會。重聚！
If just a few calves survive to adulthood, the future of the herd will be secure.
如果只有幾頭小牛能活到成年，牛群的未來，也將是有保障的。
