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When a Goliath like this is fully grown, even the most vicious predators keep their distance,
當這樣的龐然大物發育成熟，即使最兇惡的食肉動物也要避讓三分
even the most ferocious raptor of the Cretaceous--Deinonychus.
包括白堊紀最兇猛的猛禽--恐爪龍。
At 90 kilos, this raptor pales in comparison to its 50-ton quarry.
它體重只有九十千克，這樣的猛禽與50噸重的獵物相比蒼白無力。
If we're talking about a single adult Deinonychus and a single adult Sauroposeidon,
如果有一只恐爪龍與一只波塞東龍，
the story would go something like this.
故事大概會這樣發展。
"Hi! I'm a Deinonychus." "I'm a Sauroposeidon." Kuh!
"你好，我是恐爪龍"。"我是波塞東龍"。踩扁！
But for a Sauroposeidon, reaching full size can take years.
但對于波塞東龍來說，發育成熟需要數年時間。
To make things worse, fossil evidence shows that juveniles live alone,
更糟的是化石證據表明，幼龍是獨居的，
separated from the herd until they reach at least a third of their adult weight.
它們遠離獸群直到體重達到成年龍的三分之一以上。
That means for nearly a decade, they wander the forest alone.
這意味著在近十年的時間里，它們不得不在森林里自力更生。
And that forest is crawling with Deinonychus.
而森林恰恰是恐爪龍的天下。
Intelligent and well armed, they hunt on their own or sometimes in packs.
它們聰明而又裝備齊全，有時候獨獵，有時候群體出動。
They run with a top speed of 65 kilometers per hour. These raptors can take on a youngster.
它們的最快時度能達到六十五公里。這些猛禽能捕食幼龍。
For a young Sauroposeidon, there's just one solution. Get big quickly.
對波塞東龍幼龍來說，辦法只有一個。快速變大。
And that's going to take a lot of fuel.
而變大需要很多能量。
The number-one concern in life would be feeding the beast.
當務之急就是如何填飽肚子。
The land is covered in vast forests of ferns, pines, and monkey puzzle trees.
森林茂密，遍布蕨類，松樹以及智利南美杉。
Many of these plants have almost no nutritional value.
很多植物幾乎沒有任何營養價值。
The hardest job in the animal world, the dinosaur world, was not T. Rex's job.
在動物世界，恐龍世界生存對于雷克斯霸王龍來說并不是最艱難的。
Digesting meat is a piece of cake. It's very, very simple.
消化肉食根本就是小菜一碟。簡單至極。
Digesting plant fiber is the hardest job in the world.
消化植物纖維才是最困難的事情。
To gain enough nutrients to grow indestructibly large,
為了獲得足夠的營養長成無人能欺的龐然大物，
Sauroposeidon has to consume huge amounts of vegetation.
波塞東龍必須吞食大量植被。
They were like walking vacuum cleaners.
它們就像行走的吸塵器。
If you've got 40 or 50 tons of flesh to feed and you eat low-quality food,
如果要長到四五十噸，光靠吃劣質食物的話
you have to put away hundreds of pounds, maybe a ton of this stuff, every day.
每天必須消耗數百磅或許一噸食物。
