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Tyrannosaurus Rex...a skull almost one and half metres long. Up to 60 serrated teeth.
霸王龍，頭骨有一點五米長。有六十顆鋸齒。
Able to cover 5 metres in a single stride.
上下顎開合能覆蓋五米的區域。
This is one of the biggest carnivorous dinosaurs ever to walk the earth.
這是地球史上最大的食肉恐龍。
T. Rex has bone-crushing teeth.
霸王龍擁有碎骨巨齒。
They're huge and two or three or four times the strength, for their body size, of any other meat eater.
它們體型巨大，并擁有數倍于其體重以及其他食肉恐龍體重的力量。
But a T. Rex is born into a world of enemies.
但是霸王龍卻生在一個危機四伏的世界中。
And survival, for this goliath, is never guaranteed.
生存，對于這種巨獸來說，也并非易事。
Herbivores are not dummies.
食草類恐龍可不是傻子。
They'll try to remove the dangerous elements in a preemptive strike.
它們會先發制人地消除潛在的危險因素。
If you're a baby Tyrannosaur, every mega-herbivore in the environment wants to crush you.
如果你是只小霸王龍，周圍的每只大型食草恐龍都想將你踩死。
Even the Triceratops with its tiny brain, is aware of the T. Rex's potential menace.
即使是大腦奇小的三角龍也能意識到霸王龍的潛在威脅。
Knowing that one day this tiny T. Rex chick will grow into a menacing monster, easily able to attack and defeat this plant eater.
它知道總有一天這只霸王龍幼崽會成長為可怕的掠食者，能夠輕易攻擊并擊敗這只食草恐龍。
But maybe that the worst enemy is a bit closer to home.
但是最可怕的危險也許在巢穴附近。
Probably the greatest danger to a baby T. Rex is another T. Rex, the family from over the hill.
對于一只霸王龍幼崽的最大威脅就是另一只霸王龍，來自山的另一側。
Because Darwinian calculus tells you, the predator, to eliminate your competition, other predators, whenever you can.
因為達爾文的數據表明，掠食者應盡可能地鏟除其他的掠食者。
Male lions defend their cubs against rivals who see their offspring as future competition for food and mates.
雄獅會保護幼崽免受那些把幼崽視作未來的食物與配偶競爭者的傷害。
So it is likely that an intelligent predator like T. Rex would do the same.
所以對于智力發達的霸王龍來說，它們也會這么做。
Compared to prehistoric plant eaters, its cerebrum, the part of the brain associated with strategy, is huge.
與史前食草動物相比，它的大腦中掌管策略的部分體積很大。
So is the cerebellum, which controls muscle function.
小腦也很大，負責控制肌肉的功能。
This is an animal that can plan and execute a devastating attack.
這是一種可以計劃并執行一次致命攻擊的動物。
It's a behavior hardwired into the brain.
這種行為在其腦中已根深蒂固。
If you're trying to increase your evolutionary advantage, the best thing you can do is get more offspring into the future generation.
如果要增加進化的優勢，最佳方式就是讓更多幼崽能夠存活到下一代。
And one of the best ways you can do that is to take better care of the offspring that you produce.
而保證這樣的最佳方式就是盡可能地保護好幼崽。
Laying eggs nearly depletes a female.
產卵已經讓雌龍筋疲力竭了。
She needs nourishment to stay strong. And nourishment means meat.
它需要補充營養 保持體力。而營養就意味著肉。
While she searches for her next meal, the male stays behind to guard the nest.
在它出去覓食的時候，雄龍在巢穴邊留守看護。
