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But in this prehistoric world, giant carnivores with ultra-keen senses and powerful, razor-sharp weaponry are everywhere.
但在史前世界里，機敏兇猛的大型肉食動物幾乎無處不在。
Throughout the Cretaceous, hungry carnivores patrol the landscape.
縱觀整個白堊紀，饑餓的食肉動物游走在陸地上。
They are the most terrifying predators the world has ever known.
它們是史上最兇險的捕食者。
Their plant-eating prey, though, are well armed and well armored.
而它們的獵物，食草動物也全副武裝。
They don't give in without a fight.
它們決不會輕易投降。
But prehistoric herbivores have a problem.
但史前食草動物有個軟肋。
They lack the brainpower of the carnivores that hunt them.
它們不如那些追殺它們的食肉動物聰明。
Sauroposeidon's brain is so tiny, it can barely process any information at all.
波塞東龍的大腦如此之小，簡直難以處理任何信息。
So just how did these intellectually challenged giants cope in such a dangerous world?
那么這些智力低下的龐然大物是如何在如此危險的環(huán)境下生存的呢？
There has to be some sort of device that compensated for this diminished capacity to make individual choice, and it's got to be society.
一定有些補救措施讓它們能夠作出個體反應，這就是群居。
Sauroposeidon defend themselves against super-predators by working and thinking together.
波塞東龍以群體思考和行動來抵御捕食者的攻擊。
So you have group intelligence, group memory, group decision-making replacing individuality.
它們用群體的智慧，記憶以及群體決策替代個體。
Living as a group is vital for Sauroposeidon's survival. lndividually, their huge size is a powerful defense,
在群體中生活對于波塞東龍的生存至關重要。對于個體而言，龐大的身軀就是最佳防御，
but sticking together makes these Leviathans almost indestructible.
而聚集起來，這些龐然大物就變得堅不可摧。
Keeping a herd of 50-ton animals filled up, however, means traveling vast distances,
然而讓重達五十噸的巨獸群填飽肚子意味著要走很遠，
grazing a territory covering thousands of square kilometers.
通常要在上千平方公里的區(qū)域尋找食物。
And moving a mountain of flesh requires sophisticated coordination.
移動如此龐大的身軀要有極強的協(xié)調能力。
One of the curious things about sauropods is that they did have a swelling in the spinal cord, in the neighborhood of their pelvis.
蜥腳類恐龍的奇妙之處在于它們在骨盆附近的脊髓處有個突起。
It's sort of like a second brain help control the back half of the body
就像第二個大腦來控制后半部分身體，
It's called the sacro-lumbar expansion,
這叫做腰底擴張，
a bundle of nerves which acts like a primitive brain controlling the movements of the back legs and tail.
一組神經(jīng)發(fā)揮簡易大腦的作用，控制著后腿和尾部的活動。
The brain in Sauroposeidon's head is simply too small and far away to coordinate its front and back legs.
波塞東龍頭部的大腦太小，距離后腿又遠，很難控制后半部分身體。
So a second brain operates at the back of the animal.
所以其后半部分由第二個大腦來操控。
