they illuminate the southern skies...
但天空中的这种现象 不仅仅是赏心悦目而已
but there's more to this heavenly display than meets the eye.
南极光揭示了地球的磁场
The Aurora Australis reveals Earth's magnetic field,
科学家们相信是一种隐形的自然力量 而鲸鱼可以感应
an invisible force scientists believe whales can sense
利用它们大脑的磁性粒子 感应到这种自然力量
using magnetic particles in their brains.
体内的指南针让座头鲸不会偏离正轨
This internal compass keeps the humpback on course,
精确度只有一度的误差
accurate to one degree.
这种自然力量引领它进入开阔的海洋 但在这里很难找到食物
But it leads him out into the open ocean where the fish and crustaceans he eats
特别是它吃的鱼类和甲壳类海洋生物
are hard to find.
它已经有几星期没有进食
It's been weeks since he last ate.
但就在这时,它听到了什么
But then... ...he hears something.
把自己的身体作为一个巨大的扩音器
Using his body like a giant microphone,
声音的震动通过它的骨架
sound vibrations rush through his skeleton,
直接传入头部
straight to his head.
几百公里以外 有其他鲸鱼欢迎的讯号♥
The welcome calls of other whales, hundreds of miles away.
它接收到逐渐增强且接连不断的声音
He homes in on a growing barrage of sound.
终于,在离开南极洲五个星期之后
Finally, five weeks after leaving Antarctica,
它找到其他鲸鱼 一起开始一场饕餮盛宴
he joins hundreds with other whales for a monster feast.
这是地球上座头鲸最大的集♥会♥之一
One of the largest humpback gatherings on the planets,
有数以百条鲸鱼出席
there are hundreds of them.
人们最近才发现这种每年一度的集♥会♥
This annual assembly has only recently been discovered.
在距离非洲海岸五公里以外 强劲的洋流造成了营养上涌作用
Three miles off the coast of Africa, strong currents create an upwelling
带来了各种海洋生物
of nutrients and an explosion of life.
它一口就呑噬数以千计的鱼类和虾
In a single mouthful, he swallows thousands of fish and shrimp,
摄取15万卡路里的热量
150,000 calories,
相等于食了600块朱古力
that's the equivalent of 600 chocolate bars.
吃饱了之后 它必须离开自己的朋友们
Once fully fed, he must leave his friends
独自上路
and head off alone
去完成自己伟大的北上之旅
to complete his epic journey north.
有些动物有能力 跨越整个地球完成旅行程
There are animals with the power to travel right across the globe,
但最勇敢的生物 却是你绝对想像不到的
but the most intrepid of all is a creature you'd never expect.
英国的乡郊
The British countryside...
是一只橱柜蜘蛛宝宝的家
...home to a baby cupboard spider,
它只有针头那么大
no bigger than a pinhead.
有大约200个兄弟姐妹
She's got about 200 brothers and sisters.
兄弟姐♥妹♥们♥的餐桌礼仪 可真是骇人听闻
And her siblings have some truly appalling table manners.
这些小蜘蛛会吃同类
These spiderlings are cannibals.
这是一场谁都不想参加的家庭聚餐
This is one family meal you don't want to hang around for.
最好尽快离开,而且越远越好
Better get away as fast and as far as she can.
问题是它的兄弟姐♥妹♥们♥ 也有同样的计划
The trouble is her siblings have the same plan.
它已经走投无路
And she just ran out of road.
但到了逃跑的关键时刻 这只蜘蛛有一种非凡的技巧
But when it comes to great escapes, this spider has an extraordinary skill.
它吐出带有负电荷的蜘蛛丝
She fires out negatively charged silk thread
发射到带有正电荷的空气中
into the positively charged atmosphere.
异性相吸
Opposites forces attract,
把它拉起来
pulling her up,
把它拉高
up
带它逃出生天
and away.
它高高挂在空中
Heading high,
御风而行
riding the wind,
甚至利用气流喷射
even cruising the jet stream,
它可以到几千公里之外
she can travel for thousands of miles.
凭藉热气球旅行 它们在地球各个角落繁殖起来
By ballooning,they've colonized every corner of the Earth.
借助风力
At the mercy of the wind,
它无法控制自己落到哪里
she has no control over where she touches down.
但它的体重比一粒沙还要轻 可以停留在水面上
But weighing less than a grain of sand, she doesn't even break the surface.
它又一次利用自己的魔法蜘蛛丝
She just deploys her magical silk once more,
像风筝一样飞到了安全的地方
and kitesurfs to safety.
找到了它可以称之为家的地方
A new place she can call home.
有一种动物的旅程与时机密切相关
One animal's journey is all about timing.
等待行星对齐
Waiting for the planets to align
它就可以从一个世界
so it can transcend from one world
穿越到另一个世界
to another.
一条近一米长的肩章鲨
A threefootlong epaulette shark
可能看起来 不是最有冒险精神的旅行者
may not seem the most adventurous traveler....
它甚少远离自己居住的珊瑚礁
He rarely even strays far from his patch of reef.
但在某些特别的夜晚
But on some special nights,
天体的运行让它的世界天翻地覆
heavenly bodies turn his world upside down.
满月时
At full moon,
春潮让几十亿吨♥海水涌过珊瑚礁
a spring tide pulls billions of gallons of water off the reef,
让各种生物搁浅在潮水潭的迷宫中
stranding creatures in a maze of tidal pools.
甚至更恶劣
Or worse.
鱼类离开水很快就会窒息而死
Left high and dry, a fish out of water soon suffocates.
除非是一条有超级力量的鱼
Unless... it's a super fish.
一条会走路的鲨鱼
A walking shark.
它不单是在自救
And he's not just saving his skin,
它还在潜行徘徊
he's on the prowl.
到布满各种被潮水搁浅的生物
Heading towards rich hunting pools
到那里的水潭里狩猎
full of prey trapped by the tide.
从肌肉发达的鱼鳃喷射出一股水流
Forcing a jet of water through his muscular gills,
它把猎物吸入嘴中
he hoovers up his cornered victims.
但它在与时间竞赛
But he's caught in a race against time.
水潭里的氧气消耗得很快
Oxygen levels in the pool are falling fast.
很快它就没有能量了
Pretty soon, he'll run out of energy.
一小时后,潮水才到来,它奄奄一息
With an hour till the tide returns, he's close to death.
但这种极端的条件触发了 一种非凡的生理反应
But these extreme conditions trigger an extraordinary physiological response.
它降低呼吸的速度
Slowing his breathing,
减低心跳频率
reducing his heart rate,
甚至关闭部分的大脑功能
even shutting down part of his brain.
进入了一种自我引发的昏迷状态
He enters a selfinduced coma....
只要一息尚存 它可以存活一个小时
One last breath, and he can survive for an hour.
但一小时之后,它就玩完了
But after that, his time is up.
终于,潮涨了
Finally, the tide turns,
它浸在富含氧气的海水中
immersing him in oxygenrich waters.
奇迹地复活了
A miraculous resurrection.
或者最不可思议的旅程
Perhaps the most impossible journeys of all
是属于那些根本不会动的生物
are made by those who can't even move.
植物传播的方式
The secret to how plants spread
是靠种子
is seeds.
种子蕴含着所有新生命需要的原料
All the ingredients for new life,
执好行李准备出发
packed and ready to go.
有些还进化出爆破机制
Some have evolved explosive mechanisms...
另一些则会利用风力
...others harness the wind.
但有一种狡猾的植物 会让其他生物带着自己旅行
But one cunning plant simply makes someone else do all the legwork.
非洲平原上的一只雌性粪金龟
A female dung beetle on the African plains.
只有一样东西可以让它奋不顾身
There's only one thing that will make her go to extraordinary lengths:
那就是羚羊粪便的甜美气息
the sweet scent of antelope droppings.
这是它孩子的完美食物
Perfect food for her young.
它利用自己的触须
Using her antennae,
选择最多汁的一块
she selects the juiciest morsel.
闻起来是
It smells like it,
看起来是
it looks like it,
滚起来也是
it even rolls like it.
但这个粪球是假冒的
But this poop is an imposter.
它太像真的了
It's so convincingly like the real thing;
粪金龟准备为之一战
she's prepared to fight for it.
得胜之后,它带着自己的战利品
Victorious, she heads off to stash her prize away
离开了
from the competition.
但它上当了
But she's been duped.
它以为自己把食物藏起来
She thinks she's hiding it,
但实际上却是种下了它
but really she's planting it.
在狡猾的象苇种子 这次令人惊异的历险过程中
She's nothing more than a vehicle
粪金龟只不过是个交通工具而已
in the incredible adventure of the cunning elephant reed.
有一种动物耗尽一生的时间 来完成一次旅程
One animal traveler takes the journey of a lifetime,
为着回到自己出生的地方
just to get back to where it started.
这条幼虫留在匈牙利一个河床之上
This nymph has been hanging out in a Hungarian riverbed.
过去三年一直在储能量
For the last three years, she's been building strength
准备完成一次不可思议的旅程
for an incredible journey.
当水温变得合适时
When the water temperature is just right,
它离开了这个世界
she departs one world
进入另一个世界