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Only 3 percent of the water
on our planet is fresh.
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00:00:40,418 --> 00:00:44,298
Yet these precious waters
are rich with surprise.
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00:00:57,684 --> 00:01:02,964
All life on land is ultimately
dependent upon fresh water.
4
00:01:34,468 --> 00:01:38,428
The mysterious tepuis of Venezuela -
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00:01:39,765 --> 00:01:44,285
isolated mountain plateaus
rising high above the jungle.
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00:01:54,278 --> 00:01:59,118
This was the inspiration
for Arthur Conan Doyle's 'Lost World,'
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00:01:59,408 --> 00:02:02,448
an imagined prehistoric land.
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00:02:09,000 --> 00:02:13,640
Here, strange towers of sandstone
have been sculptured over the millennia
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00:02:13,963 --> 00:02:17,083
by battering wind and torrential rain.
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00:02:30,562 --> 00:02:34,522
Moisture rising as water vapor
from the surface of the sea
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00:02:34,774 --> 00:02:37,694
is blown inland by wind.
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00:02:50,080 --> 00:02:54,000
On reaching mountains,
the moisture is forced upwards
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00:02:54,292 --> 00:02:59,492
and as it cools, it condenses
into cloud and finally rain -
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00:02:59,838 --> 00:03:02,918
the source of all fresh water.
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00:03:13,476 --> 00:03:18,356
There is a tropical downpour here
almost every day of the year.
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00:03:30,201 --> 00:03:35,081
Fresh water's journey starts here,
high in the mountains.
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00:03:52,137 --> 00:03:55,257
Growing from humble streams
to mighty rivers
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00:03:55,516 --> 00:03:59,076
it will travel hundreds
of miles to the sea.
19
00:04:37,596 --> 00:04:41,956
Angel Falls,
the highest waterfall in the world.
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00:04:56,656 --> 00:05:01,656
Its waters drop unbroken
for almost a thousand meters.
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00:05:11,211 --> 00:05:13,171
Such is the height of these falls
22
00:05:13,380 --> 00:05:17,660
that long before the water reaches
the base in the Devil's Canyon
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00:05:17,925 --> 00:05:21,045
it's blown away as a fine mist.
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00:05:53,583 --> 00:05:55,143
In their upper reaches,
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00:05:55,335 --> 00:05:58,655
mountain streams are full of energy.
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00:06:01,549 --> 00:06:04,429
Streams join to form rivers,
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00:06:04,677 --> 00:06:06,077
building in power,
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00:06:06,262 --> 00:06:08,062
creating rapids.
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00:06:18,398 --> 00:06:20,438
The water here is cold.
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00:06:20,650 --> 00:06:24,050
Low in nutrients, but high in oxygen.
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00:06:28,032 --> 00:06:30,232
The few creatures
that live in the torrent
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00:06:30,450 --> 00:06:33,090
have to hang on for dear life.
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00:06:35,372 --> 00:06:38,412
Invertebrates dominate
these upper reaches.
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00:06:38,667 --> 00:06:42,267
The hellgrammite, its body flattened
to reduce drag,
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00:06:42,587 --> 00:06:46,787
has bushy gills to extract
oxygen from the current.
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00:06:51,304 --> 00:06:55,744
Black fly larvae anchor themselves
with the ring of hooks,
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00:06:59,353 --> 00:07:01,273
but if these become unstuck,
38
00:07:01,480 --> 00:07:05,000
they're still held
by a silicon safety line.
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00:07:18,579 --> 00:07:22,179
There are advantages to life in the fast stream -
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00:07:22,457 --> 00:07:26,297
bamboo shrimps can just sit
and sift out passing particles
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00:07:26,587 --> 00:07:28,787
with their fan-like forearms.
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00:07:48,523 --> 00:07:52,403
Usually, these mountain streams
only provide enough food
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00:07:52,694 --> 00:07:55,374
for small animals to survive.
44
00:07:55,696 --> 00:07:58,816
But with the spring melt here in Japan
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00:07:59,075 --> 00:08:02,395
monsters stir in their dens.
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00:08:10,711 --> 00:08:14,991
Giant salamanders, world's largest amphibian,
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00:08:15,298 --> 00:08:17,938
almost two meters long.
48
00:08:21,221 --> 00:08:25,501
They're the only large predator
in these icy waters.
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00:08:29,812 --> 00:08:32,572
They begin their hunt
at night.
50
00:08:47,828 --> 00:08:52,148
These salamanders have
an exceptionally slow metabolism.
51
00:08:52,458 --> 00:08:56,498
Living up to 80 years
they grow into giants.
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00:09:13,811 --> 00:09:16,491
The fish they hunt are scarce
53
00:09:16,730 --> 00:09:19,770
and salamanders have poor eyesight.
54
00:09:22,819 --> 00:09:25,579
But sensory nodes
on their head and body
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00:09:25,781 --> 00:09:29,421
detect the slightest changes
in water pressure.
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00:09:41,045 --> 00:09:42,885
Free from competition,
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00:09:43,088 --> 00:09:46,248
these giants can dine alone.
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00:09:59,978 --> 00:10:03,498
Pickings are usually thin
for the salamanders,
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00:10:03,816 --> 00:10:06,536
but every year some
of the world's high rivers
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00:10:06,777 --> 00:10:10,217
are crowded by millions of visitors.
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00:10:17,703 --> 00:10:20,223
The salmon have arrived.
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00:10:28,005 --> 00:10:32,565
This is the world's largest
fresh water fish migration.
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00:10:36,887 --> 00:10:38,527
Across the northern hemisphere
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00:10:38,723 --> 00:10:42,283
salmon, returning from the ocean
to their spawning grounds,
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00:10:42,560 --> 00:10:46,080
battle their way
for hundreds of miles upstream.
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00:10:51,276 --> 00:10:55,996
Up here, there are fewer predators
to eat their eggs and fry.
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00:11:24,431 --> 00:11:26,911
A grizzly bear.
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00:11:29,103 --> 00:11:31,063
From famine to feast -
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00:11:31,355 --> 00:11:33,275
he's spoilt for choice.
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00:11:40,488 --> 00:11:43,048
This Canadian bear is very special -
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00:11:43,283 --> 00:11:46,403
he's learnt to dive for his dinner.
72
00:12:01,508 --> 00:12:05,308
But catching salmon in deep water
is not that easy
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00:12:05,595 --> 00:12:08,275
and the cubs have lots to learn.
74
00:12:46,257 --> 00:12:48,777
The annual arrival
of spawning salmon
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00:12:49,010 --> 00:12:52,410
brings huge quantities
of food into these high rivers
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00:12:52,680 --> 00:12:55,640
that normally struggle
to support much life.
77
00:13:09,154 --> 00:13:11,154
Although relatively lifeless,
78
00:13:11,364 --> 00:13:14,484
the power of the upland rivers
to shape the landscape
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00:13:14,743 --> 00:13:18,583
is greater than any other stage
in a river's life.
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00:13:20,873 --> 00:13:22,313
Driven by gravity,
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00:13:22,458 --> 00:13:25,978
they're the most erosive forces
on the planet.
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00:13:30,341 --> 00:13:33,061
For the past 5 million years
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00:13:33,302 --> 00:13:37,982
Arizona's Colorado river
has eaten away at the desert's sandstone
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00:13:38,264 --> 00:13:41,224
to create a gigantic canyon.
85
00:13:52,277 --> 00:13:54,357
It's over a mile deep
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00:13:54,530 --> 00:13:59,050
and at its widest
it's 17 miles across.
87
00:14:12,797 --> 00:14:14,677
The Grand Canyon.
88
00:14:34,984 --> 00:14:39,624
This river has cut
the world's longest canyon system -
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00:14:39,904 --> 00:14:44,904
a 1,000 mile scar
clearly visible from space.
90
00:15:11,684 --> 00:15:14,284
As rivers leave the mountains behind,
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00:15:14,479 --> 00:15:19,319
they gradually warm
and begin to support more life.
92
00:15:28,075 --> 00:15:33,115
Indian rivers are home
to the world's most social otter -
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00:15:34,164 --> 00:15:39,404
smooth-coated otters
form family groups up to 17 strong.
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00:15:50,887 --> 00:15:54,527
Group rubbing not only
refreshes their coats,
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00:15:54,766 --> 00:15:57,726
but strengthens social bonds.
96
00:16:07,528 --> 00:16:09,088
When it comes to fishing
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00:16:09,237 --> 00:16:12,437
there is real strength in numbers.
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00:16:25,419 --> 00:16:30,179
Fishing practice begins
when the cubs are four months old.
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00:16:49,233 --> 00:16:55,073
Only the adults have the speed
and agility needed to make a catch.
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00:17:33,858 --> 00:17:38,258
Adults share their catches
with their squabbling cubs.
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00:17:49,539 --> 00:17:51,699
Most otters are solitary,
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00:17:51,958 --> 00:17:56,958
but these rich warm waters
can support large family groups
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00:17:57,630 --> 00:17:59,990
and even bigger predators.
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00:18:19,692 --> 00:18:25,532
Mugger crocodiles, four meters long,
could easily take a single otter.
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00:18:51,722 --> 00:18:54,202
But, confident in their gangs,
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00:18:54,391 --> 00:18:58,671
the otters will actively harass
these great reptiles.
107
00:19:16,661 --> 00:19:19,381
Team play wins the day.
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00:19:30,383 --> 00:19:31,903
The Mara river,
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00:19:32,093 --> 00:19:35,573
snaking across the plains
of East Africa.
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00:19:37,723 --> 00:19:39,363
As the land flattens out
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00:19:39,558 --> 00:19:43,118
rivers slow down
and lose their destructive power.
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00:19:44,104 --> 00:19:47,464
Now they are carrying
heavy loads of sediment
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00:19:47,690 --> 00:19:50,170
that stains their waters brown.
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00:20:03,538 --> 00:20:07,098
Lines of wildebeest are on their march.
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00:20:12,088 --> 00:20:17,328
Each year nearly two million animals
migrate across the Serengeti plains
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00:20:17,635 --> 00:20:20,795
in search of fresh green pastures.
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00:20:21,055 --> 00:20:22,695
For these thirsty herds
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00:20:22,889 --> 00:20:26,249
the rivers are not only
a vital source of drinking water,
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00:20:26,518 --> 00:20:29,518
but also dangerous obstacles.
120
00:20:49,373 --> 00:20:55,253
This is one of the largest concentrations
of Nile crocodiles in Africa,
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00:20:55,795 --> 00:20:59,395
giants that grow over five meters long.
122
00:21:16,022 --> 00:21:19,542
From memory, the wildebeest are coming
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00:21:19,817 --> 00:21:22,457
and gather in anticipation.
124
00:22:27,505 --> 00:22:31,665
The crocodile's jaws
snap tight like a steel trap -
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00:22:31,926 --> 00:22:34,726
once they have a hold,
they never let go.
126
00:22:47,857 --> 00:22:52,337
It took over an hour
to drown this full-grown bull.
127
00:23:00,786 --> 00:23:02,666
To surprise their prey
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00:23:02,871 --> 00:23:06,871
crocodiles must strike
with lightning speed.
129
00:23:32,190 --> 00:23:38,950
Here, only the narrowest line
separates life from death.
130
00:24:15,439 --> 00:24:18,039
Most rivers drain into the sea,
131
00:24:18,274 --> 00:24:22,514
but some end their journey
in vast lakes.
132
00:24:25,615 --> 00:24:31,895
Worldwide lakes hold twenty times
more fresh water than all the rivers.
133
00:24:34,248 --> 00:24:39,128
The East African Rift Valley
holds three of the world's largest:
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00:24:39,419 --> 00:24:43,659
Malawi, Tanganyika, and Victoria.
135
00:24:45,592 --> 00:24:48,272
Lake Malawi, the smallest of the three,
136
00:24:48,469 --> 00:24:50,869
is still bigger than Wales.
137
00:25:04,192 --> 00:25:07,912
Its tropical waters teem
with more fish species
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00:25:08,195 --> 00:25:09,915
than any other lake.
139
00:25:10,739 --> 00:25:14,099
There are 850 different cichlids alone,
140
00:25:14,326 --> 00:25:17,766
all of which evolved
from just one single ancestor
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00:25:17,997 --> 00:25:21,277
isolated here thousands of years ago.
142
00:25:36,097 --> 00:25:40,817
These two-meter wide craters
are fish-made.
143
00:25:50,527 --> 00:25:53,287
Fastidiously maintained by the males,
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00:25:53,488 --> 00:25:56,448
these bowls are courtship arenas.
145
00:26:09,794 --> 00:26:13,434
Cichlids are caring parents.
146
00:26:17,135 --> 00:26:21,975
Brooding young in the mouth
is a very effective way of protecting them.
147
00:26:23,724 --> 00:26:26,804
This lake can be a dangerous place.
148
00:26:39,530 --> 00:26:46,530
After dark, predatory dolphin fish
emerge from their daytime lairs among the rocks.
149
00:26:51,500 --> 00:26:56,700
Like packs of sharks,
they're on the prowl for sleeping cichlids.
150
00:27:04,137 --> 00:27:07,617
In the darkness these electric fish hunt
151
00:27:07,848 --> 00:27:13,408
by detecting distortions in the electric
field they create around their bodies.
152
00:27:32,288 --> 00:27:36,688
Any cichlid that trenches out
will be snapped up.
153
00:27:58,437 --> 00:28:04,637
The floor of Lake Malawi
drops 700 meters into an abyss.
154
00:28:12,408 --> 00:28:14,248
Here, in this dead zone
155
00:28:14,410 --> 00:28:18,810
the larvae of lake fly midges
hide out away from predators.
156
00:28:22,667 --> 00:28:25,427
In the rainy season
they balloon up to the surface
157
00:28:25,670 --> 00:28:28,670
and undergo a magical transformation.
158
00:28:38,766 --> 00:28:43,326
At dawn the first adult midges
start to break out.
159
00:28:47,482 --> 00:28:51,642
Soon, millions upon millions
of newly hatched lake flies
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00:28:51,903 --> 00:28:53,663
are taking to the wing.
161
00:29:04,415 --> 00:29:09,775
Early explorers told tales
of lakes that smoked, as if on fire.
162
00:29:11,588 --> 00:29:15,428
But these spiraling columns
hundreds if meters high
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00:29:15,717 --> 00:29:17,677
are mating flies.
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00:29:32,149 --> 00:29:33,869
Once the flies have mated,
165
00:29:34,068 --> 00:29:36,348
they will all drop
to the water surface,
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00:29:36,570 --> 00:29:39,570
release their eggs and die.
167
00:29:49,581 --> 00:29:52,621
Malawi may look like an inland sea,
168
00:29:52,877 --> 00:29:56,957
but it's dwarfed
by the world's largest lake -
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00:29:58,257 --> 00:30:01,697
Baikal in Eastern Siberia.
170
00:30:12,269 --> 00:30:15,309
400 miles long and over a mile deep,
171
00:30:15,564 --> 00:30:18,804
Baikal contains one fifth
of all the fresh water
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00:30:19,068 --> 00:30:22,108
found in our planet's
lakes and rivers.
173
00:30:25,365 --> 00:30:31,285
For five months of the year
it's sealed by an ice sheet over a meter thick.
174
00:30:47,385 --> 00:30:50,145
Baikal is the oldest lake in the world
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00:30:50,388 --> 00:30:56,228
and, despite the harsh conditions,
life flourishes here in isolation.
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00:30:57,770 --> 00:31:01,210
80 percent of its species
are found nowhere else on Earth,
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00:31:01,440 --> 00:31:05,640
including the world's
only fresh water seal.
178
00:31:12,659 --> 00:31:13,859
With this seal
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00:31:13,994 --> 00:31:16,674
and its marine-like forests of sponges
180
00:31:16,871 --> 00:31:20,471
Baikal seems more like
an ocean than a lake.
181
00:31:40,059 --> 00:31:46,219
There are shrimp-like crustaceans -
giant amphipods - as large as mice.
182
00:31:52,362 --> 00:31:55,722
They are the key scavengers
in this lake.
183
00:31:55,949 --> 00:32:01,949
The water here is just too cold for the bacteria
that normally decompose the dead.
184
00:32:16,135 --> 00:32:19,335
Most rivers do not end in lakes
185
00:32:19,595 --> 00:32:22,275
but continue their journey
to the sea.
186
00:32:27,645 --> 00:32:32,805
The planet's indisputable super-river
is the Amazon.
187
00:32:34,776 --> 00:32:40,976
It carries as much water
as the next top-ten biggest rivers combined.
188
00:32:44,244 --> 00:32:50,324
Rising in the Peruvian Andes,
its main trunk flows eastwards across Brazil.
189
00:32:50,750 --> 00:32:55,430
On its way the system drains
a third of South America.
190
00:32:56,755 --> 00:33:00,475
Eventually, over 4,000 miles
from its source,
191
00:33:00,717 --> 00:33:03,957
it empties into the Atlantic Ocean.
192
00:33:11,644 --> 00:33:15,764
The Amazon transports
a billion tons of sediment a year,
193
00:33:16,065 --> 00:33:19,985
sediment clearly visible
at the mixing of the waters
194
00:33:20,278 --> 00:33:25,598
where one massive tributary,
the Rio Negro, flows into the main river.
195
00:33:32,080 --> 00:33:34,600
Its waters are wonderfully rich.
196
00:33:34,790 --> 00:33:39,030
To date over 3,000 species
of their fish have been described -
197
00:33:39,295 --> 00:33:42,375
more than in the whole
of the Atlantic Ocean.
198
00:34:11,157 --> 00:34:14,317
The Amazon is so large
and rich in fish
199
00:34:14,536 --> 00:34:17,696
that it can support
fresh water dolphins.
200
00:34:17,914 --> 00:34:23,154
These botos are huge -
two and a half meters long.
201
00:34:25,295 --> 00:34:30,855
In these murky waters they rely
on sonar to navigate and hunt.
202
00:34:48,859 --> 00:34:53,659
They work together to drive
shoals of fish into the shallows.
203
00:35:57,506 --> 00:35:59,426
Botos are highly social
204
00:35:59,633 --> 00:36:04,273
and in the breeding season
there is stiff competition for mates.
205
00:36:04,680 --> 00:36:08,160
The males hold court
in a unique way.
206
00:36:19,777 --> 00:36:22,217
They pick up rocks in their jaws
207
00:36:22,446 --> 00:36:25,526
and flaunt them
to their attending females.
208
00:36:30,370 --> 00:36:34,490
Maybe each male is trying to show
how strong and dexterous he is
209
00:36:34,791 --> 00:36:39,911
and that he therefore is the best father
a female could have for her young.
210
00:36:51,473 --> 00:36:55,433
Successful displays lead to mating.
211
00:37:10,449 --> 00:37:13,169
Even for giant rivers like the Amazon
212
00:37:13,410 --> 00:37:18,730
the journey to the sea
is not always smooth or uninterrupted.
213
00:37:47,108 --> 00:37:51,388
Iguassu Falls on the border
of Brazil and Argentina
214
00:37:51,696 --> 00:37:54,616
is one of the widest waterfalls
in the world -
215
00:37:54,823 --> 00:37:57,743
one and a half miles across.
216
00:38:04,374 --> 00:38:10,174
In flood 30 million liters
of water spill over every second.
217
00:38:57,965 --> 00:39:01,285
All the world's
great broad waterfalls:
218
00:39:01,510 --> 00:39:05,230
Victoria, Niagara and here, Iguassu,
219
00:39:05,514 --> 00:39:09,314
are only found
in the lower courses of their rivers.
220
00:39:17,609 --> 00:39:19,249
In their final stages
221
00:39:19,444 --> 00:39:24,164
rivers broaden and flow wearily
across their flat flood plains.
222
00:39:25,324 --> 00:39:27,444
Each wet season here, in Brazil,
223
00:39:27,660 --> 00:39:30,260
the Parana river overflows its banks
224
00:39:30,453 --> 00:39:33,533
and floods an area
the size of England.
225
00:39:37,377 --> 00:39:38,657
The Pantanal -
226
00:39:38,795 --> 00:39:41,715
the world's largest wetland.
227
00:39:48,971 --> 00:39:53,331
In these slow-flowing waters
aquatic plants flourish
228
00:39:53,683 --> 00:39:58,643
like the Victoria giant water lily
with leaves two meters across.
229
00:40:22,460 --> 00:40:27,380
These underwater forests
are nursery grounds for fish.
230
00:40:29,175 --> 00:40:34,255
Over 300 species breed here,
including red-bellied piranha
231
00:40:39,142 --> 00:40:43,422
and other predators,
like the spectacle caiman.
232
00:41:10,547 --> 00:41:14,027
Ripening fig trees
overhanging the water's edge
233
00:41:14,258 --> 00:41:17,778
provide welcome food
for shoals of hungry fish.
234
00:41:24,852 --> 00:41:27,532
The commotion attracts dorado,
235
00:41:27,771 --> 00:41:31,051
known locally as the river tiger.
236
00:41:38,823 --> 00:41:41,183
They patrol the feeding shoals,
237
00:41:41,409 --> 00:41:44,209
looking for a chance to strike.
238
00:42:22,572 --> 00:42:24,292
And waiting in the wings,
239
00:42:24,490 --> 00:42:27,210
ready to pick off any injured fish,
240
00:42:27,451 --> 00:42:29,331
are the piranhas.
241
00:42:41,673 --> 00:42:44,873
The feeding frenzy quickly develops.
242
00:43:03,150 --> 00:43:07,310
Piranha can strip a fish
to the bone in minutes.
243
00:43:14,203 --> 00:43:20,283
Great numbers of fish
sustain vast flocks of water birds.
244
00:43:23,503 --> 00:43:30,783
The rose-eared spoonbill is just one of the 650
bird species found in the Pantanal.
245
00:43:38,184 --> 00:43:43,664
They nest alongside wood stocks
in colonies thousands strong.
246
00:44:12,840 --> 00:44:15,440
Spectacle caiman linger below,
247
00:44:15,676 --> 00:44:18,596
waiting for a meal
to fall out of the sky.
248
00:45:16,525 --> 00:45:18,525
When rivers finally reach the sea
249
00:45:18,735 --> 00:45:23,335
they slow down, release
their sediment and build deltas.
250
00:45:25,449 --> 00:45:29,409
In Bangladesh the Ganges
and Brahmaputra rivers join
251
00:45:29,662 --> 00:45:31,702
to form the world's biggest.
252
00:45:34,541 --> 00:45:38,981
Every year almost 2 thousand
million tons of sediment
253
00:45:39,255 --> 00:45:43,055
eroded from the Himalayas
is delivered to the ocean.
254
00:45:48,346 --> 00:45:52,666
At the delta's mouth -
the largest mangrove forest in the world,
255
00:45:52,934 --> 00:45:54,694
the Sundarbans.
256
00:46:01,358 --> 00:46:05,478
These extraordinary forests
spring up throughout the tropics
257
00:46:05,737 --> 00:46:09,137
in these tidal zones
where rivers meet the sea.
258
00:46:19,875 --> 00:46:23,315
Crab-eating macaques
are mangrove specials.
259
00:46:27,841 --> 00:46:34,721
In Indonesia these monkeys have
adopted a unique amphibious lifestyle -
260
00:46:42,146 --> 00:46:44,866
they fish out fallen food.
261
00:47:08,920 --> 00:47:14,640
The troop also uses the waters
to cool off during the heat of the day.
262
00:47:19,639 --> 00:47:24,879
But the channels are also the playground
for restless young macaques.
263
00:47:30,815 --> 00:47:35,095
Some of the young have even taken
to underwater swimming.
264
00:47:40,950 --> 00:47:43,830
They can stay down
for more than 30 seconds
265
00:47:44,078 --> 00:47:47,038
and appear to do this
just for fun.
266
00:47:59,760 --> 00:48:03,640
Yet these swimming skills
acquired during play
267
00:48:03,888 --> 00:48:09,288
will certainly be useful later in life
in these flooded mangrove forests.
268
00:48:18,068 --> 00:48:21,788
In cooler climes, mud, laid down in estuaries,
269
00:48:22,030 --> 00:48:24,990
is colonized by salt marsh grasses
270
00:48:25,200 --> 00:48:28,920
and form one of the most
productive habitats on the planet.
271
00:48:59,357 --> 00:49:06,517
400,000 greater snow geese flock to the estuaries
along the Atlantic coast of the United States
272
00:49:06,989 --> 00:49:11,269
to rest and refuel
on their long migratory journeys.
273
00:49:48,861 --> 00:49:52,141
This is the end of the river's journey.
274
00:49:52,364 --> 00:49:55,004
Collectively they've
worn down mountains
275
00:49:55,199 --> 00:49:56,919
and carried them to the sea.
276
00:49:57,077 --> 00:49:58,437
And all along the way,
277
00:49:58,620 --> 00:50:03,700
their fresh water has brought life
and abundance to planet Earth.
278
00:50:04,701 --> 00:50:05,901
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