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In larger mountain chains, the quest for food can become even more demanding.
在比較大的山脈，尋找食物的旅程可能來得更加困難。
The andes in South America. The longest range on earth.
南美的安地斯山脈。地球上最長的山脈。
It stretches for over 4,500 miles down towards the antarctic.
它往下方的南極延伸超過4500英里。
At its southernmost end, the sun remains so low in the sky that it brings little warmth,
在它的最南端，太陽維持在天空很低的角度，只帶來很少的溫暖，
and temperatures regularly drop below freezing.
溫度通常低于冰點。
In winter, the land is shrouded in darkness for almost 15 hours a day.
在冬天，一天有大約15小時的時間，是大地籠罩在黑暗之中的。
Here, a predator has to hunt when it's so dark that only a thermal camera can make its activities visible to our eyes. The puma.
在這里，掠食者必須在很暗的時候狩獵，只有熱成像攝影機能讓我們的眼睛看到它的活動。美洲獅。
This one-year-old female faces a daunting prospect.
這只一歲大的母獅，面臨著一個令人氣餒的前景。
She has just left her mother and become independent at the most demanding time of the year, when prey is at its most scarce.
它才剛離開母親出來獨立，就趕上了一年中最艱巨的時期--獵物最稀少的時期。
The only substantial targets are a kind of llama. Guanaco.
唯一顯著的目標是駱馬的一種。原駝。
An adult stands one-and-a-half metres tall and is twice the puma's weight.
一只成年原駝高1.5米，體重是美洲獅的兩倍。
This female, however, has one advantage -- excellent night vision.
然而這只母獅有一項優勢，絕佳的夜視能力。
If the youngster can get within five metres of a guanaco, she has a chance of success.
如果年輕母獅能接近到原駝的五米范圍內，它就有機會能成功。
But the guanaco do have a very acute sense of smell and excellent hearing.
但原駝有很靈敏的嗅覺和極佳的聽力。
After six hours of patient stalking from downwind, the puma is finally within striking distance.
在下風處耐心地跟蹤長達六小時后，美洲獅終于進入了攻擊范圍內。
