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Ankylosaurus represents the end of the history of the armored dinosaurs, the ultimate in dinosaurian tanks.
甲龍代表了恐龍家族中裝甲恐龍的終結(jié)，是恐龍?zhí)箍酥械捻敺濉?/div>
But some dinosaurs don't rely on body armor and weapons for defense.
但有些恐龍并不依靠護甲或者武器來自衛(wèi)。
They have an entirely different strategy-- grow bigger. Much, much bigger.
它們有一種完全不同的策略長得更大。非常龐大。
Montana, America. It's not called the Wild West for nothing.
美國，蒙大拿。"荒蠻西部"并非徒有虛名。
Hungry predators are everywhere.
饑腸轆轆的捕食者隨處可見。
In response, prey developed an incredible array of defensive strategies.
對此，獵物們也想出了各種各樣奇特的防衛(wèi)策略。
Strategies that don't rely on intelligence, but on physical traits.
這些策略并不依靠智力而是依靠身體。
Sauroposeidon is a gargantuan beast, growing to 50 tons or more.
波塞東龍是一種龐然巨獸體重超過五十噸。
Sauroposeidon was one of the largest animals that ever lived on land.
波塞東龍是當時體型最大的陸生動物之一。
If you're gigantic, there are fewer and fewer predators that can attack you.
如果你體型龐大，那攻擊你的食肉動物會少之又少。
So getting big is the only game in town.
所以變大是唯一的生存手段。
A fully grown Sauroposeidon is 19 meters tall and almost 30 meters long.
一只成年波塞東龍能有十九米高，三十米長。
Its neck alone is four stories long, a single vertebra almost as tall as a grown man.
單單是脖子就有四層樓那么高，一根椎骨更是和成人身高相仿。
And a single thighbone weighs over half a ton.
一根股骨就有半噸重。
They seem to break all of the rules.
一切規(guī)則對它們都不適用。
There's nothing like them around today.
現(xiàn)今再也沒有動物比得上它們。
Containing over 72 million calories of fresh meat,
它們的肌肉里含有七千二百萬卡路里的熱量，
you'd thlnk Sauroposeidon would be the jackpot for a bloodthirsty carnivore.
你一定會以為波塞東龍是血腥食肉動物的大餐了吧。
They don't have horns. They don't have armor.
它們沒有角，也沒有裝甲。
Really, the only antipredator defense they have is sheer size. And size does matter.
唯一阻擋捕食者的防御就是它們的龐大體型。而體型確實很管用。
