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As the Sun disappears, a profound change takes place in the ocean.
晝去夜至，海洋發生了另一個重大變化
Deep water plankton start to rise from the depths
深海的浮游生物開始浮上水面，
and another hungry army prepares to receive it.
另一支饑餓的部隊準備接受這些獵物
Every night, wherever conditions are right,
如果環境適宜，每天晚上
countless millions of creatures from the deep migrate to the surface, seeking food.
會有無數的深海生物到海面來覓食。
A baby sailfish, fifteen centimeters long, snaps up everything in it's path.
一條小旗魚僅15厘米長，邊游邊大快朵頤。
In three years' time, it'll be one of the oceans most formidable hunters, weighing sixty kilos.
再過3年，它將重達60公斤，成為海洋中強大的獵手。
Just now, however, it's very vulnerable.
只是現在很弱小罷了。
These manta rays are giants. Eight meters across and weighing over two tons.
這種蝠鲼非常巨大。8米寬,超過2噸重。
The blade-like projections on either side of the head help to steer plankton into the manta's mouth.
頭部對稱的2塊刀片狀的凸狀物幫助蝠鲼把浮游生物送到嘴里。
