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Stalking the Cretaceous are predators like Tyrannosaurus Rex, with jaws that can bite down with nearly four tons of force.
在白堊紀潛伏著雷克斯霸王龍這樣的捕食者，它們的血盆大口有四噸的咬力。
And Deinonychus, sporting claws that could slice right through flesh.
而恐爪龍它們的爪子可以割穿血肉。
But the prey these carnivores hunt are heavily armed.
然而這些食肉動物的獵物也是全副武裝。
Often in reconstructions of dinosaurs, we just see the meat eaters attacking the herbivores,
在對恐龍化石的重塑過程中，我們總想著食肉動物會攻擊食草動物，
and it's easy to miss the fact that, in the real world, herbivores fight back.
很容易忽視一個事實，就是在現實世界里食草動物是會還擊的。
The plant eater Sauroposeidon defends itself by growing to mammoth proportions.
以植物為食的波塞東龍通過迅速長大進行防御。
This one is a juvenile. But it's almost 6 meters tall, an animal on the edge of adolescence and an animal on the run.
這只恐龍尚未成年。但已將近6米高了，它即將度過青春期，它正在逃跑中。
It's being chased by two raptors...these raptors are known as Deinonychus.
它被兩只猛禽類追趕著這兩只猛禽正是恐爪龍。
These tiny killers work as a team.
這些瘦小的殺手結隊作戰。
Deinonychus wouldn't weigh much more than a human being.
恐爪龍不比人重多少。
And when they're attacking things like Sauroposeidon,
當它們攻擊像波塞東龍這樣的獵物時，
it would be a big advantage for them to be able to act as a group.
團隊作戰對它們來說是個巨大的優勢。
They're actually increasing their chance of getting a meal. It's a strategy still used today.
事實上，它們增加了自己獲得食物的機會。這種策略一直沿用至今。
Working together, lions will take on prey as big as a four-ton elephant, and they only have teeth and claws.
攜手合作的獅群能捕食重達四噸的大象，而它們只有牙齒和利爪。
Deinonychus employs an array of weaponry more powerful than any creature today.
恐爪龍擁有的武器比今天任何生物的都要強大。
Sauroposeidon's only defense is its massive size,
波塞東龍只靠它那龐大的身軀防御，
but Deinonychus have learned that nearly any defense can be breached with the right armaments...
但恐爪龍卻知道，只要使用正確的武器，任何形式的防御都能被擊破。
Like recurved hand claws almost 8 centimeters long,
比如近8厘米長的內彎手爪形似登山者的鞋釘，
designed to grip into the bodies of prey like a mountain climber's spikes.
專門用于刺進獵物的身體。
The ideal attack is to jump up, grab ahold of the prey, position the prey, and then strike.
理想的攻擊就是跳到獵物身體上，抓緊獵物貼住不放，然后開始出擊。
So the arms are to position your body to deliver that killing blow.
所以胳膊是用來穩住身體以便送出必殺一擊。
It could strike very quickly, and it could, if it was attacking a larger animal,
它出擊速度非常快，如果攻擊更大的動物，
use those arms to pull itself up against it.
它可以靠胳膊爬到獵物背上。
By doing so, it could bring its other main weapon into attack, and that's its foot claws.
這樣，可以讓其它主力武器投入戰斗，也就是腳爪。
