to enter another.
它的蜕变有如变魔术
It's a magical transformation.
一只蜉蝣出生了
A mayfly is born.
不只是一只
And not just one...
每分钟都有几千只浮出水面
...thousands emerge every minute.
尽管有很多被猎食者吞噬
Though many are eaten by predators,
但它们是靠人多势众保障群体安全
there is safety in numbers.
但数量很快就变成了最大的挑战
But numbers soon become her greatest challenge.
它被一群雄性追求者围攻
She's mobbed by an army of male suitors.
怀着8000个受精卵 它很快就需要产卵
Weighed down with 8,000 fertilized eggs, she needs to lay soon.
这里是最适合它宝宝成长的地方
This is the best place for her young to grow
但如果在这里产卵的话
but if she laid here,
水流会把卵带走
the current would carry her eggs away.
它必须要去再上游的地方
She has to make it further upstream.
它的偏光视觉可以看到河水的反光
Her polarized vision picks up light reflecting off the river.
这条闪闪发光的路 通向它的目的地
A shimmering path leading to her final destination.
几小时后,它就前进了近十公里
In just a few hours, she travels six miles.
在生命快要终结时 它来到了自己生命开始的
Close to death, she reaches the same stretch of river
那条河道
where her life began.
这里是完美的产卵地 卵可以顺流而下
The perfect place to lay so her eggs can drift downstream
在它当年成长的地方孵化
and hatch in exactly the same spot where she grew up.
它的生命走到了尽头 新的生命开始了
As her life ends, others begin.
现在,它的孩子们开始了自己的旅程
Now, her offspring start their own voyage
一路回到一切开始的地方
all the way back to where it began.
开始一段新旅程时,有时候第一步
When starting a new journey, sometimes it's the first step
是最可怕的
that's the most terrifying of all.
经过20小时破壳而出的过程
After 20 hours trying to break free...
海雀幼鸟第一眼看到的世界
...a guillemot chick's first view of the world is this...
是在300米高的峭壁上
1,000 feet up.
仿佛是在帝国大厦的顶端鸟瞰
It's like peering off the top of the Empire State Building.
为什么要在这个 如此危险的地方出生呢?
But why be born in such a dangerous place?
这个位于爱尔兰的悬崖 大多数猎食者都无法抵达
This Icelandic cliff is inaccessible to most predators.
是安全成长的天堂
A safe haven to grow up in.
但三星期之后,它们就要离巢了
But in just three weeks, it will be time to leave the nest.
这只幼鸟将要面对一次生与死的决定
And this chick will face a lifeordeath decision.
它和父母之间的关系已经很紧密了
Her bond with her parents is already strong.
这种关系在它孵化出来之前就开始了
It started long before she even hatched.
父母回应它第一声轻柔的呼唤
Responding to her first gentle calls,
从它在蛋壳里时就开始与它交流
her parents talked to her... ...inside the egg.
这些早期的对话
These early conversations
确保初生小鸟对父母的认识及信任
ensured the newborn already recognizes and trusts Mom and Dad.
它的父母孜孜不倦地喂食
Her parents work tirelessly to feed her up
为即将开始的旅程做准备
in preparation for the journey ahead.
数星期过去了 想满足它不断增加的胃口越来越难
But as the weeks pass, it gets harder to satisfy her growing appetite.
现在这个一直保护它的悬崖上的家
And now this clifftop home that protected her
也被乌鸦...
has been discovered...
发现了
by ravens.
猎食者会吃掉百分之七十的幼鸟
Predators kill up to 70 percent of chicks
面对这种威胁,父母几乎无力反抗
and parents are almost defenseless against the threat.
这次,这只幼鸟很幸运
This time, the chick gets lucky.
但它要在乌鸦再来之前离开这里
But she needs to leave before the ravens return.
问题是
The problem is,
没有成鸟的羽毛,它没办法飞行
without adult feathers, she can't fly.
它的父亲鼓励它跳下去
Her father encourages her to jump.
这是垂直超过一百层楼的高度
It's a vertical drop of more than onehundred stories....
幼鸟完全信任父亲 它迈出了信任的一步
Trusting him completely, the chick takes a leap of faith....
小鸟拍打双翅似乎是无用的
The chicks flapping seems futile.
但却足够减慢速度
But it's just enough to slow her down
让它远离嶙峋的岩石
and steer her away from the jagged rocks.
柔软的绒毛卸去落地时撞击的力度
Her downy feathers soften the landing.
这趟看似不可能的旅程 对它能否存活下去至关重要
This seemingly impossible journey is vital to her survival.
现在来到了大海上 爸爸可以带它去找食物了
Now out at sea, Dad can lead her to food.
它会遇到更多障碍
She will face many more obstacles,
但凭藉超强的勇气 它会闯过这些难关
but with extraordinary bravery, she can make it through.
动物们会利用非凡的感知
When animals can tap into remarkable senses
和超自然的技巧
and supernatural skills...
横越整个地球
crossing the globe,
甚至在不同的世界中穿越
even moving between worlds
去寻找伴侣
to find a mate,
安全和食物
safety and food,
此时的它们势不可挡
they become truly unstoppable.
你认为自己了解大自然
If you think you know nature,
再想一想
think again.