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Whole populations of animals are now forced to travel great distances in pursuit of food and warmth.
動物們成群結隊踏上，尋找食物和溫暖的長途旅程
300,000 Baikal teal gather to escape from the Siberian winter by migrating south to Korea
30萬只花臉鴨集體遷往南方的韓國，躲避西伯利亞的嚴冬
the world's entire population in a single flock.
僅這一群便集中了世界上所有的花臉鴨
But there are parts of the world that have no seasons.
但是，世界上有些地方卻沒有四季
In the tropics the sun's rays strike the earth head on
在熱帶地區，太陽輻射直射大地
and their strength is more or less constant all year round.
全年始終或多或少地，受到這種影響力的控制
That is why the jungle grows so vigourously and supports so much life.
因此，這里的叢林茂密蔥郁，生命在此欣欣向榮
This forest covers only 3 percent of the planet's surface,
這些森林僅覆蓋了地球表面的3%
but it contains more than 50 percent of all its plants and animals.
但其中的動植物種類卻占到了全球的50%
The canopy is particularly rich.
樹冠層是生命最繁榮的地方
There are monkeys, birds and millions of species of insects, exactly how many we have no idea.
這里有猴子、鳥、還有數百萬種昆蟲，至于確切數量我們不得而知
The character of the forest changes as we descend,
從上到下，森林的特點也在發生改變
becoming ever darker and damper, favouring different kinds of animals and plants.
越往下就越陰暗潮濕，適合各種不同種類的動植物
