狂野地球（2020）

终于安全了
Safe at last.
最终，他会再生的
In time,he'll eventually regenerate.
袭击他的人可能没那么幸运
His attackers may not be so lucky.
光滑的黄貂鱼到达，能吃多少吃多少的自助餐
Smooth stingrays arrive for this all-you-can-eat buffet.
很难知道从哪里开始
It's hard to know where to start.
主菜
Entree.
主要的
Main.
甜点
Dessert.
他的尾巴一甩，
And with a flick of his tail,
他一会儿就回来了
he is back for seconds.
螃蟹唯一的防御措施就是数量庞大
The crabs' only defence is in their sheer numbers.
黎明前，
By dawn,
数以百计的人被清扫
hundreds have been hoovered up.
终于满足了，
Finally satiated,
光线潜射进阴暗处
the rays slink into the murk.
幸存的蜘蛛蟹庄严地向深处行进，
The surviving spider crabs march solemnly towards the depths,
跨过倒下的同志
stepping over fallen comrades.
还是吃剩的午餐？
Or is it leftover lunch?
这群明年将再次为同样可怕的事件开会
This mob will meet again next year for the same gruesome event
在塔斯马尼亚的冬季水域
in Tasmania's winter waters.
在非洲大♥陆♥，
On the continent of Africa,
是雨水的运动为生命设定了脉搏
it's the movement of rain that sets the pulse for life.
到八月，
By August,
自然界最伟大的迁徙之一正在进行中
one of the natural world's greatest migrationsis now underway.
在肯尼亚和坦桑尼亚边境，
On the border of Kenya and Tanzania,
角马在移♥动♥
wildebeest are on the move.
离开塞伦盖蒂后，
Having left the Serengeti,
他们向北行驶了500多公里
they have travelled over 500 kilometres north.
走向马赛马拉的大草原，
Towards the savannah grasslands of the Masai Mara,
地平线上的暴风雨是他们的灯塔
storms on the horizon are their beacon.
他们本能地知道哪里下雨
They know instinctively that where there's rain.
那里有更绿的牧场
there's greener pastures.
随着活动的支流汇合，
As the living tributaries converge,
角马越来越多
the wildebeest grow in numbers.
很快牛群就超过一百万只了
Soon the herd is over one million strong.
到八月，
By August,
牛群到达马拉河
the herd reaches the Mara River.
鳄鱼一直在等着它们
The crocodiles have been expecting them.
对一些人来说，
For some,
这是第一次
this is the first time
他们遇到了这样的障碍
they've encountered such an obstacle.
其他人都很清楚会发生什么
Others know all too well what's to come.
牛群首领评估危险，
Herd leaders assess the danger,
寻找一个可能会好一点的过河点
searching for a crossing point where the odds seem just a little bit better.
它们停在水边，
They pause at the water's edge,
等着有人打破队形
waiting for someone to break rank.
不知怎么的，
Somehow,
他越过了等待的下巴
he makes it past the waiting jaws.
然后，象大坝决口
Then,the dam breaks.
一小时后，
In an hour,
成千上万的人会在这一刻穿越
thousands will cross at this one point.
大多数人会成功的
Most will make it.
有些人不会
Some will not.
这条河牺牲了自己
The river takes its sacrifice.
随着雨云的移♥动♥，
As the rain clouds move on,
牛羚也是
so too do the wildebeests.
去肯尼亚渴望的牧场
To the lust pastures of Kenya.
再往南，在赞比亚，
Further south,in Zambia,
缺少雨水和无情的阳光将地球上的生命吸走
the lack of rain and relentless sunshine sucks the life from the earth.
晴朗的蓝天受到胭脂红食蜂人的欢迎
The clear blue skies are welcomed by Carmine bee-eaters.
每年，
Every year,
它们向南迁移数百公里，汇聚在这里，
they migrate hundreds of kilometres southward to converge here,
在赞比亚的卢安瓜河上
on Zambia's Luangwa River.
当水位下降时，它暴露了河岸
As the water level drops,it exposes the riverbank.
这就是鸟儿们所寻找的
This is what the birds are seeking.
因为那是它们筑巢的地方
For it's where they nest.
每只鸟都争先恐后地找一个地方
Each bird rushes to secure a spot.
但他们不一定会得到他们的最好选择
But they won't necessarily get their first choice.
白额食蜂鸟已经在这里了
Resident white-fronted bee-eaters are already here.
他们常年生活在这个地区
They live year-round in the region.
最近搬到河边繁殖
And recently moved to the riverbank to breed.
他们开始挖地洞了
They've had a head start making burrows.
不打架就不会被驱逐
And won't be evicted without a fight.
但这些移♥民♥并没有白跑这么远
But the migrants haven't travelled this far for nothing.
一块黄金地段的房♥地♥产♥抵得上每一根羽毛
A prime patch of real estate is worth every flying feather.
这两种鸟都在河岸边挖洞产卵
Both bird species dig into the riverbank to lay their eggs.
洞穴的位置是关键
The location of the burrow is key.
太接近底部，爬行动物会从门中突入
Too close to the bottom and reptiles can barge through the door.
太接近顶端了，
Too close to the top,
其他偷蛋贼也很容易找到
and they're in easy reach for other egg thieves.
河岸中间是最佳位置
The middle of the bank is optimum.
路人可以做到这一点
Passers-by can do just that.
谢天谢地，
Thankfully,
所有的街区都有食物供应
all neighbourhoods have access to food.
即使是在旱季，
Even mid-dry season,
卢安瓜河的永久性水洞孕育着水生昆虫
permanent waterholes of the Luangwa River harbour aquatic insects.
鸟儿是敏捷的猎人
And the birds are nimble hunters.
但是他们最喜欢的食物是沿着河岸
But their favourite food is along the riverbank.
八月，
In August,
香肠树开花了
the sausage tree is in bloom.
这是蜜蜂的繁荣
That's a boom for bees.
还有吃蜜蜂的
And bee-eaters.
这种饮食的唯一问题是尾巴上的刺
The only problem with this diet is the sting in the tail.
但这很快就失效了
But that's quickly disabled.
像所有宁静的日子一样，
Like all halcyon days,
他们很快就会结束
they'll soon be over.
吃蜜蜂的鸟必须在雨过天晴和河水上涨之前孵化雏鸟
The bee-eaters must hatch and fledge their chicks before the rains return and the river rises.
当这种情况发生时，
When this happens,
河岸的巢穴将消失在水下
the riverbank nests will vanish underwater.
鸟儿会再次振翅飞翔
And the birds will once again,take to the wing.
非洲大♥陆♥上的大型动物迁徙与非洲海中的类似迁徙不相上下
The great animal migrations on the African continent are rivalled by similar migrations in the African seas.
沿着南非夸祖鲁-纳塔尔海岸线，
Along the KwaZulu-Natal coastline in South Africa,
一股冷水流席卷海岸，
the arrival of a cold-water current sweeps up the coast,
携带着大量浮游生物
carrying with it a bloom of plankton.
这股凉爽的北流帮助数十亿沙丁鱼寻找食物
This cool,northwards flow helps propel billions of sardines in search of food.
在他们的巅峰时期，
At their peak,
浅滩可以跨越7公里，
shoals can span over seven kilometres,
为掠食者提供不可抗拒的诱惑
providing an irresistible lure for predators.
普通海豚大军，15000或更多，
Army of common dolphins,15,000 or more,
准备发动协同攻击
arrive ready to strike in a coordinated assault.
他们把沙丁鱼群分开，
They separate the school of sardines,
用吹泡泡的方法把鱼围起来
corralling the fish by blowing a barricade of bubbles.
把它们编织成越来越紧的球
Weaving them into tighter and tighter balls.
当他们把沙丁鱼推到水面时，
As they push the sardines to the surface,
小鱼无处可逃
the tiny fish have nowhere to escape.
战斗中油腻的气味吸引了更多饥饿的食肉动物
The oily scent of the battle attracts more hungry predators.
灰暗的鲨鱼为了利用海豚的辛勤劳动而冲进来
Dusky sharks move in to take advantage of the dolphins' hard work.
下颚精确地划过饵球
Jaws slash through the bait balls with precision.
地面的震动向空中攻击部队发出信♥号♥♥
The churn on the surface signals to the aerial attack force.
塘鹅在盘旋
Gannets hover.
然后他们也加入了狂猛
Then they too,join the fury.
以每小时100公里的速度潜水，
Diving at 100 kilometres an hour,
他们把水和鱼雷打到深处
they strike the water and torpedo to depth.
但这场盛宴是值得的
But the feast is worth it.
沿着海岸线的食肉动物不可能总是依赖沙丁鱼
The predators along this coastline cannot always rely on the sardines passing their way.
海洋变暖意味着触发沙丁鱼运动的冷洋流发生得越来越晚
Warming oceans means the cool currents which trigger the sardine run have been happening later and later.
有些年，
Some years,
运行完全失败
the run has failed completely.
对于地球上的许多物种来说，
For many species across our planet,
由于全球气温上升，自然事件发生的时间正在改变
the timing of natural events is changing because of rising global temperatures.