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  • Just how big did the dinosaurs get?

    恐龍到底有多大?

  • Meet the world's first dinosaur.

    來看看世界上第一隻恐龍。

  • No, down here.

    不對,在下面。

  • Eoraptor would have only come up to about your knees.

    始盜龍的身高只到你的膝蓋。

  • In fact, most early Triassic dinosaurs were on the shrimpy side, including predators like the fierce, mule-sized Coelophysis.

    事實上,大多數早三疊世的恐龍都處於瀕臨滅絕,包括肉食動物,比如兇猛的騾子,體型大小的腔骨龍。

  • But after volcanic eruptions took out their competitors and ushered in the Jurassic period, everything changed.

    但火山爆發後,殺光了他們的競爭對手,並迎來了侏羅紀時期,一切都改變了。

  • New species exploded onto the scene like the plate-covered Scelidosaurus.

    新物種的數量激增,就像被板塊覆蓋的腿龍。

  • And bigger herbivores meant bigger meat eaters too.

    更大的草食動物,也代表有更大的肉食動物。

  • Predators, like the Dilophosaurus got to be six meters long.

    肉食動物,比如六公尺長的雙脊龍。

  • But they were no match for the real giants of the era, Prosauropods.

    但牠們都不是這個時期真正的巨人,原蜥腳類。

  • Now, these leaf eaters weren't much bigger than a giraffe.

    這些吃樹葉的恐龍並沒有比長頸鹿大。

  • On the inside, they looked like a bird.

    他們的體內看起來像一隻鳥。

  • And it's this anatomy that enabled Prosauropods to evolve into the largest dinosaurs of all time.

    正是這種解剖學使原蜥腳類進化成歷史上最大的恐龍 。

  • So let's take a closer look.

    讓我們來仔細看看。

  • Specialized lungs and air sacs allowed them to take in more oxygen and also made their skeletons lighter, hollowing out bone into a sturdy, honeycomb structure.

    專門的肺和氣囊可以吸收更多的氧氣,也使牠們的骨骼更輕,中空的骨骼變成堅固的蜂巢狀結構。

  • Millions of years of evolution later, you can see the difference.

    數百萬年的進化之後你可以看出差異 。

  • Ornithischian dinosaurs like Triceratops and Stegosaurs lack these air sacs and as a result, most of them weren't very big.

    三角龍和劍龍屬於鳥臀目恐龍,缺少這些氣囊,因此牠們大多數的體型並不大。

  • While Triceratops and Stegosaurus grew up to eight meters long, bird-like theropods like Tyrannosaurus grew twice as large.

    當三角龍和劍龍長到八公尺長時,像暴龍這樣的獸腳亞目類恐龍長了兩倍大。

  • But it was the sauropods like Brontosaurus, Diplodocus and Brachiosaurus who reached enormous proportions.

    但蜥腳下目類的恐龍,比如雷龍梁龍和腕龍達到了巨大的比例。

  • Like the theropods, these titans used air sacs to breathe and had light, hollow bones.

    像獸腳亞目類恐龍一樣,這些巨人使用氣囊來呼吸,而且有很輕的中空骨骼。

  • But they had another reason for outgrowing everyone else at the time: survival.

    但他們還有另一個原因比其他恐龍長得更大:倖存。

  • Their size was a great defense against predators and the largest of the bunch stood over 26 meters long, weighed 55 tons or more,

    牠們的體型是抵禦肉食動物的有力武器,最大的一群超過 26 公尺長,重達 55 噸以上。

  • and could reach several stories up with their long necks which came in handy for gathering enough food.

    可以用長脖子伸長到好幾層樓高,方便收集足夠的食物。

  • After all, you can't grow this big without a lot of energy.

    畢竟,你需要很多的能量才能長這麼大。

  • In fact, Brontosaurus ate about 45 kilograms of leaves, stems, and twigs a day.

    事實上,雷龍一天大約吃 45 公斤的葉子、莖和小樹枝。

  • But they couldn't waste energy hunting around to find those veggies.

    但是牠們不能浪費能量四處尋找那些蔬菜。

  • Instead they parked themselves in one spot for hours and used their long necks to graze up and down, stripping trees like a giant corn on the cob.

    相反,牠們讓自己停在一個地方幾個小時,並用牠們的長脖子來上下吃草,把樹剝得像玉米棒上的大玉米。

  • And the more these animals sat around and ate, the bigger they became.

    這些動物坐在這裡吃得越多,牠們就越大隻。

  • Tens of millions of years later, we see another bird-like dinosaur enter the stage.

    幾千萬年後我們看到了另一種似鳥的恐龍進入這個發展時期。

  • Titanosaurs, the largest dinosaurs in history.

    暴龍是歷史上最大的恐龍。

  • Dreadnoughtus, Patagotitan, and Argentinosaurus could stand over 20 meters long.

    無畏龍、巴塔哥泰坦巨龍和阿根廷龍可以站立超過 20 公尺長。

  • But of course, their height couldn't save them from the asteroid strike.

    但當然,牠們的身高無法拯救牠們脫離小行星撞擊。

  • And there's been nothing like them since, at least on land anyway.

    從此以後再也沒有像恐龍一樣的生物,至少在陸地上沒有類似的。

Just how big did the dinosaurs get?

恐龍到底有多大?

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B2 中高級 中文 美國腔 恐龍 動物 氣囊 骨骼 體型 劍龍

世界上最大的恐龍! (The Biggest Dinosaurs Of All Time)

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    Evangeline 發佈於 2021 年 05 月 08 日
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