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These leviathans are making a journey to nesting sites they've used for generations.
這些龐然大物正在前往它們世代繁衍的筑巢之地。
Developing inside them are hundreds of eggs.
在它們體內，上百個蛋已經發育成熟。
They're the future of a species that will be around for 15 million years, more than 75 times longer than humans have been on earth.
它們是這個已經在地球上存在了1500萬年的物種的未來，比人類在地球生存時間的75倍還要多。
Yet each egg is no larger than a cantaloupe melon.
然而每一枚蛋還不及哈密瓜的大小。
I think it's a very beautiful idea that you have this little egg that's surprisingly small and out of it comes a baby Sauroposeidon that's about the size of a rabbit.
我覺得這非常美妙，這枚蛋如此小巧，會有一只只兔子大小的波塞冬龍從中破殼而出。
And in two or three decades, it's gonna be a 50-ton adult. But just why does this huge animal have such small eggs?
二三十年后，它會長成一只50噸重的成年恐龍。但為什么這么大的動物蛋卻這么小呢？
Sauroposeidon eggs, like all eggs, are honeycombed with tiny pores to let oxygen in and carbon dioxide out.
波塞東龍的蛋，與其它的蛋一樣都布滿了讓氧氣進入和二氧化碳排出的微小氣孔。
Bigger eggs need more air holes. But if they get too big, the shell collapses.
蛋的體積越大，需要的氣孔也越多。但如果過于巨大，蛋殼就會坍塌。
That's why even today, no bird lays a larger egg than an ostrich, which weighs just over a kilogram.
這也就是為什么即使在今天也沒有哪種鳥蛋能大過鴕鳥蛋的原因，而鴕鳥蛋也才重一千多克。
Each female lays about 500 eggs a season.
每一只雌性恐龍在生育季節大約會下500枚蛋。
The moment an egg hatches marks the beginning of a race for survival, a race virtually all of them will lose.
蛋孵化的那一刻就標志著生存競賽的開始，這其實是一場沒有勝者的競賽。
Being a hatchling, you don't have horns, you don't have plates, you don't have any kind of armor on the body.
剛孵化的幼獸，沒有角和鱗片，身體上沒有任何甲殼。
Practically anything could gobble it up.
幾乎任何生物都能將它一口吞下。
Thousands of defenseless hatchlings are let loose into a world of fierce predators.
數以千計沒有保護的幼崽就這樣來到了充滿兇殘肉食者的世界。
It's a brutal way to raise a family.
這種養育后代的方式非常殘酷。
Sauropods were just trying to flood the environment with babies, just in the hopes that a few survive.
波塞東龍只是一直在瘋狂產卵，希望少數能夠存活下來。
