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Hell Creek, Montana. 68 million years ago.
蒙大拿州，海爾克里克。六千八百萬年前。
Prehistoric plant eaters live every day with a target on their back.
史前世界的食草動物每天都生活在弱肉強食的環境中。
To avoid becoming dinner, they rely on specialized evolutionary adaptations,
為了避免成為他人的晚餐，它們就得依靠各自專門的進化適應能力
internal armor, advanced designs, and armaments tougher than anything found on animals today.
內部的護甲，先進的腦部構造，以及當今世界的動物無法企及強大武裝。
These are animals that have defenses.
這些動物具有很好的防御性。
Herbivores do seem to be marvels of engineering.
這些食草動物仿佛就是工程學上的奇跡。
Very dangerous, heavily armed, heavily armored targets.
它們都有厚重的鎧甲并且全副武裝，相當的危險。
A Triceratops can hold its own against almost any predator.
三角龍可以獨自對抗任何食肉動物。
With three horns and a bony shield, even a T. Rex keeps its distance.
憑借三個犄角和骨質盾牌，即使是雷克斯霸王龍也會對它敬而遠之。
An Ankylosaurus is completely different.
甲龍則完全不一樣。
It may be an herbivore, but it has the tools to stop an attacker dead in its tracks.
也許它只是食草動物，但它的裝備能讓攻擊者有來無回。
Ankylosaurus was a walking tank-- a massively armed and armored animal.
甲龍就是一部移動的坦克，全副武裝并且防護嚴密。
Nine meters long and weighing four tons, Ankylosaurus's home is the American West.
體長九米，重達四噸的甲龍棲息在美洲大陸的西部。
Interesting thing about Ankylosaurus which makes them kind of cool is that their pelvises have been modified so it's very broad.
有趣的是甲龍之所以這么酷是因為它的盆骨進化得非常寬。
They have an enormous gut and they probably in engaging what's called fermentation digestion
它有一個巨大的腹部，在里面可能一直在進行著所謂的發酵消化，
and we see their in uh...like cows and horses and what not in.
現在的牛、馬和其它動物也有類似的功能。
They use bacteria break down the soilous material.
它們利用細菌來分解草料。
The problem is that you probably was not wanna be downwind of an Ankylosaurus just probably you stay stinking machine walking its way to the forest.
問題在于你可能不想待在甲龍的下風處，你可能就是看著這臺臭味制造機獨自走進森林。
Digesting plant fibres is the hardest job.
消化植物纖維是一樣艱巨的任務。
In the ecosystem an Ankylosaurus tank that job, which is why need that the enormous bulk gigantic stomach and some divided intestines that means...you are slow.
在生態體系中，甲龍要想完成這個任務就必須要有巨大的身軀碩大的胃部和一些分離的腸道，這意味著你行動緩慢。
You are very slow and you have to feed 12,15,18 hours a day.
你行動非常緩慢，每天要花上十二至十八個小時來進食。
Invulnerable for most of the day and therefore you have to have static armor.
為了在大部分時間內做到無懈可擊，所以必須要披上厚重的鎧甲。
