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Tenontosaurus was bigger and certainly heavier.
腱龍體型龐大且笨重。
Tenontosaurus didn't necessarily make a mistake.
它不一定是犯了致命的錯誤。
It was numbers that took him down.
它是敗給了龐大的數量。
One dinosaur even as big as Tenontosaurus can not withstand an onslaught from a pack of Raptors.
即使像腱龍這樣龐大的恐龍，也無法單獨抵抗大群的迅猛龍猛烈的攻擊。
Raptor pack kills would've continued for millions of years until their world eventually vanished.
迅猛龍殺手團伙將繼續殺戮數百萬年，直到它們的世界最終消失殆盡。
No one knows exactly what happened, but scientists have pieced together at least part of the puzzle.
沒有人準確的清楚發生了什么，但科學家們至少能拼湊出謎題的一部分答案。
Extinction of course is something that happens not just once, it happens all the time over and over again, I mean,
大滅絕事件其實并不是只有一次而是一直在一次次地發生，
for example, no dinosaur actually lasted more than a couple of million years and all the species went extinct at different times.
比如說就沒有哪種恐龍生存超過兩百萬年，各種物種會在不同的時間滅絕。
The thing about extinction events is that of course they're very bad for the animals that go extinct, but they open up a door of opportunity for a lot of other animals and plants.
說到大滅絕事件，對滅絕的動物當然是一件很糟糕的事，但也為其它的動植物開創了新的生存機遇。
And basically once certain species disappear, than other species will evolve and change and take over their place in that particular ecosystem or habitat.
某些物種一旦消失，其它物種就會進化并且接管前者在生態系統或棲息地的地位。
During the mid-Cretaceous period, the world's environment was changing globally.
白堊紀中葉正值全球環境不斷變化的時期。
And these changes can be seen in the fossil plant record.
這些變化可以從植物化石中看到。
Well, dinosaurs like Tenontosaurus and Deinonychus, for whatever reason, were unable to deal with these changes and they were replaced by other dinosaurs that were better suited for the new environment.
像腱龍和恐爪龍這樣的恐龍，不管原因如何都無法應對這些改變，最終被其它的能更好地適應新環境的恐龍取代。
Long before recorded time, packs of dinosaurs roamed the Earth, hunting and killing beasts ten times their size.
在有記載之前很久，這些殺手成群徜徉于地球之上獵捕并殺死比它們大十倍的巨獸。
But in this attack, the victim struck back and 115 million years later, the evidence unraveled with modern science lives to tell about it.
但這場戰斗中受害者反戈一擊，一億一千五百萬年后現代科學下的化石證據還在訴說這一故事。
