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But not all plant eaters in the Cretaceous live as a group. Ankylosaurus are loners.
然而白堊紀并非所有食草動物都是群居的。甲龍就是個獨行俠。
They depend on a powerful tail club and steel-like body armor to defend themselves.
它們靠尾部有力的尾錘和全身鋼鐵般的鎧甲保護自己。
Without the herd to watch your back, Ankylosaurus has to watch its own.
沒有同伴的互相幫助，甲龍全靠自己小心。
That's a job made even harder, as its worst enemy, T. Rex, can hunt under the cover of darkness.
更難的是，它的勁敵，雷克斯霸王龍能在夜幕的掩護下獵食。
Fortunately, an Ankylosaurus has another effective weapon in its armory - a highly refined sense of smell.
幸運的是甲龍還有個絕招，那就是極其敏感的嗅覺。
The nasal region of Ankylosaurus and its kin is one of the most specialized parts of its anatomy.
甲龍及其親緣物種的鼻子是它全身最特殊的一部分。
For an Ankylosaurus, a T. Rex's distinctive odor is a dead giveaway.
對于甲龍，雷克斯霸王龍發出的獨特氣味就是死亡的警示。
This is an animal for whom the sense of smell was more important, potentially, than the sense of vision.
嗅覺比視覺對于它們而言更加重要。
Ankylosaurus' nasal passages wind through the skull, significantly increasing their surface area.
甲龍的嗅覺通道蜿蜒在頭骨里，有效地增加了其感知面積。
This enlarged space is populated by millions of odor receptors.
其中還布滿上百萬個氣味感受器。
Complicated, crazy-straw, tortuous nasal passageway that went from the nostrils,
復雜而彎曲的鼻道從鼻孔開始
made several loops through the snout before it went down into the throat.
在鼻部環繞數圈一直蜿蜒到頸部。
Ankylosaurus' supersensitive nose can pick up a carnivore over two miles away.
甲龍極其敏感的嗅覺能在兩英里外就辨別出食肉動物的氣味。
If it could smell a Tyrannosaurus coming, it's got an early warning,
當它嗅到霸王龍的氣味，早早獲得敵情，
and so it can begin to react appropriately.
便可以隨之采取相應的對策。
For a hungry T. Rex, it means a meal has simply vanished into thin air.
對饑餓的雷克斯霸王龍來說，這就意味著一頓美餐化為烏有。
Never underestimate a vegetarian.
千萬不能低估了食草動物。
Parasaurolophus and Sauroposeidon rely on the numbers to spot predators before they attack.
副櫛龍和波塞東龍靠群居來警惕食肉動物的攻擊。
Ankylosaurus has an armory of senses to keep carnivores at bay.
甲龍的秘密武器是它的嗅覺可以御敵于千里之外。
But no matter how clever an herbivore may be,
但無論食草動物多聰明，
no matter how many tools they have at the ready, sometimes their time is up.
無論它們有什么本領，有時死神依然會降臨。
For herbivores, keeping one step ahead of the competition is never ending struggle.
對食草動物來說，在生死競爭中領先一步就要永遠保持戰斗狀態。
T. Rex was designed by natural selection to overcome those formidable defences.
雷克斯霸王龍在自然選擇下能夠對抗這些堅不可摧的防御手段。
