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This is the Okavango Delta
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in Southern Africa.
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An inland ocean...
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..peppered with a thousand islands.
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00:00:29,000 --> 00:00:31,440
Some are large...
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00:00:31,480 --> 00:00:33,280
others small.
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Here, the sun battles water
for control.
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Worlds are created...
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then taken away.
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To survive,
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all must cope...
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with a state of never-ending change.
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00:00:56,640 --> 00:00:59,000
From the Arctic...
(POLAR BEAR GROWLS)
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..to the tropics...
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..islands are wild laboratories...
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..where unique rules apply...
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..and nature puts life...
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..to the ultimate test.
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In the heart of Southern Africa...
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lies the Okavango Delta.
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An oasis in the desert.
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At its heart
are the permanent waters.
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These sit along vast, flat plains.
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At its farthest reaches
are the dry borderlands.
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Every year,
water surges down the rivers,
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fanning out over the desert.
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Islands emerge magically
from the sand...
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..and the largest is Chief's Island.
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The delta's waters
are constantly changing.
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It's now at peak flood...
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and Chief's Island
is brimming with animals.
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(ANIMALS CHITTER)
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This is where a hyena clan...
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..has chosen to carve out
a territory.
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(CUB SQUEALS)
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They have a queen
who rules over the clan.
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Under her leadership,
they're a stable, social unit
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that keeps everyone fed.
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They're the largest hyena clan
on the island;
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over 40 individuals.
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They need this large family.
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Their island is rich in prey,
but also rivals...
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(LOW GROWLING)
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(CUBS SQUEAL IN DISTANCE)
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..all of them vying for control...
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..of this prime hunting ground.
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Every day,
scouting parties strike out
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in the search for food.
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(HYENAS WHOOPING)
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But there's more
than just food to be found.
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Hyenas welcome the floods.
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They love playing in water...
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..and these two young sisters...
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take full advantage.
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(HYENAS CACKLING)
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Distracted, they haven't noticed
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the rest of the clan has moved on...
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(HYENAS WHINING)
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..and they are alone.
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Without backup...
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..they're in danger.
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A large pack of wild dogs
has spotted them.
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(DOG SNORTS)
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Wild dogs and hyenas
are mortal enemies.
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(UNSETTLING MUSIC BUILDS)
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So, when dogs outnumber them...
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..they'll teach them a lesson.
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(HYENA CHITTERS)
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(DOG GROWLS)
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The sisters can match them for speed
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but not stamina...
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(DOG GROWLS)
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..and they've been separated.
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(HYENA SQUEALS)
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(DOGS GROWL)
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One manages to hold them off...
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(HYENA SQUEALING)
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..so they turn on her smaller sister.
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(GROWLING)
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(DOG BARKS)
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(HYENA SQUEALS)
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It's only the crushing power
of her jaws...
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..that makes them think twice.
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Point made, the dogs lose interest.
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Off to harass someone else.
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In the future, the sisters must stay
closer to the safety of the clan.
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(HYENA SQUEALS)
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(CUB GROWLING)
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Back at their island den,
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the rest of the family
are enjoying a feast.
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(CHOMPING)
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But tougher times lie ahead.
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Soon, the waters
around Chief's Island will fall,
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and prey will be free to leave.
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Finding food for this large family...
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..will become a challenge.
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(WIND WHISTLES)
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The delta,
on which all the animals depend,
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is a result of geological events
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00:07:07,080 --> 00:07:10,520
set in motion millions of years ago.
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(THUNDER CRACKS)
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Beneath the desert,
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Africa started to tear itself apart.
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Huge chunks of rock collapsed,
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creating a depression.
(ROCK CRACKING)
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Rivers filled it with sand...
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..eventually forming the wide,
flat delta we see today.
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(WIND WHISTLES)
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00:07:39,760 --> 00:07:44,520
Every year, these vast plains are
covered with flood water...
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..revealing thousands of islands.
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Some are tiny...
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..others larger,
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but many have one thing in common.
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They owe their existence
to some of the tiniest of creatures.
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(SINISTER MUSIC)
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Termites.
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They quietly labour...
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..building a city made of soil.
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Deep within is something remarkable.
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(OMINOUS MUSIC)
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The beating heart of the colony.
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(TERMITE QUEEN'S BODY SQUELCHES)
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This is the termite queen.
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She's so large, she's helpless...
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..so is cleaned and fed
by her devoted workers.
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She might be 20 years old.
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Her destiny is to reproduce...
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..laying 20,000 eggs every day.
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Most will become new workers
for the colony.
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They have a special task.
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These tiny insects
are island engineers.
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(FUTURISTIC ELECTRONIC MUSIC)
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They build,
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00:09:31,640 --> 00:09:34,360
one mouthful of soil at a time...
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..glued together
with their own saliva.
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The termites collect more
and more soil...
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..a quarter of a tonne a year.
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They create a giant mound...
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..rising clear of the water.
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00:10:01,640 --> 00:10:04,160
But this is only the first act.
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00:10:05,640 --> 00:10:07,560
As weather erodes the soil...
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..a platform is created
on which more mounds can grow.
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00:10:16,040 --> 00:10:17,920
Over hundreds of years,
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mounds rise, fall,
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00:10:20,600 --> 00:10:22,480
and rise again.
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00:10:24,040 --> 00:10:27,000
An island slowly takes shape...
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..eventually...
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..becoming huge.
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These islands, created by some
of the smallest creatures...
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..are home to some
of the largest animals on Earth.
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00:10:48,200 --> 00:10:50,200
(ELEPHANT GRUNTS)
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00:11:06,440 --> 00:11:08,160
Over the last few weeks...
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00:11:09,200 --> 00:11:11,960
..the delta's waters
have been falling.
154
00:11:13,680 --> 00:11:17,040
Chief's Island has now disappeared.
155
00:11:20,480 --> 00:11:24,520
And so, times have changed
for the hyena clan.
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00:11:25,760 --> 00:11:28,200
Gone are the days of easy pickings.
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Their prized island has withdrawn
its greatest benefit.
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00:11:37,480 --> 00:11:41,800
Before, prey animals were trapped
by high water.
159
00:11:42,960 --> 00:11:47,160
But now, they're free
to escape the hyenas.
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00:11:48,720 --> 00:11:54,120
Being the biggest, baddest clan
is an asset in the good times...
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00:11:55,240 --> 00:11:58,800
..but now they're just
extra mouths to feed.
162
00:12:02,440 --> 00:12:05,840
Finding enough food
is their full-time job.
163
00:12:08,120 --> 00:12:10,840
Hyenas have an acute sense
of smell...
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00:12:10,880 --> 00:12:12,040
(HYENA SNIFFS)
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00:12:12,080 --> 00:12:15,160
..giving them the edge
over other predators.
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00:12:17,680 --> 00:12:21,080
And there's a scent on the breeze.
167
00:12:21,120 --> 00:12:23,000
(HYENA CACKLES)
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00:12:25,080 --> 00:12:27,360
A zebra...
(HYENAS CHITTERING)
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00:12:28,440 --> 00:12:30,120
..or what's left of it.
170
00:12:32,120 --> 00:12:33,680
(HYENAS CHITTERING)
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00:12:36,000 --> 00:12:38,920
Hyenas are the island's recyclers.
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Unlike their rivals,
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they can digest skin
and even solid bone.
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(CRUNCHING)
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00:12:51,280 --> 00:12:54,640
But the clan is being watched...
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..by the zebra's rightful owner.
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00:12:58,240 --> 00:13:02,400
(DEEP GROWLING)
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00:13:06,440 --> 00:13:08,880
(LION GROWLS)
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00:13:13,800 --> 00:13:16,200
(HIGH-PITCHED YAPPING)
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00:13:16,240 --> 00:13:20,600
A male lion can snap a hyena's spine
with one bite,
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00:13:20,640 --> 00:13:24,640
so this is a life-or-death gamble.
182
00:13:29,200 --> 00:13:31,760
(HIGH-PITCHED YAPPING)
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00:13:39,640 --> 00:13:41,400
(LION GRUNTS)
184
00:13:41,440 --> 00:13:44,840
But the hyenas have numbers
on their side.
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They can create chaos and confusion.
186
00:13:48,480 --> 00:13:50,040
(LION ROARING)
187
00:13:50,080 --> 00:13:51,760
(HYENA YAPPING)
188
00:13:51,800 --> 00:13:53,400
(LION GROWLING)
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(HYENA WHINES)
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00:13:58,600 --> 00:13:59,960
(LION ROARS)
191
00:14:01,680 --> 00:14:03,480
(DRAMATIC MUSIC)
192
00:14:08,040 --> 00:14:10,040
(MUSIC INTENSIFIES)
193
00:14:12,960 --> 00:14:14,720
(MUSIC FADES)
194
00:14:14,760 --> 00:14:16,160
(GROWLS)
195
00:14:16,200 --> 00:14:18,120
(HYENAS CACKLING)
196
00:14:22,360 --> 00:14:25,440
The lion can't chase them all.
197
00:14:27,840 --> 00:14:29,800
He'll bide his time.
198
00:14:32,760 --> 00:14:36,160
Hyenas better watch out.
199
00:14:36,200 --> 00:14:38,280
(GROWLS)
200
00:14:41,320 --> 00:14:43,320
(HYENAS WHOOPING IN DISTANCE)
201
00:14:44,720 --> 00:14:48,520
For the hyenas,
this will keep them going.
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00:14:50,560 --> 00:14:54,920
Their ability to survive
on skin and bones
203
00:14:54,960 --> 00:14:59,680
means there's even enough
to take back to the den.
204
00:15:01,760 --> 00:15:03,520
(CUBS SQUEAKING)
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00:15:18,520 --> 00:15:20,400
The hyenas are getting by...
206
00:15:21,800 --> 00:15:24,520
..but until the delta brings change,
207
00:15:25,520 --> 00:15:28,120
..their future hangs in the balance.
208
00:15:30,760 --> 00:15:33,440
In the farthest reaches of the delta,
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00:15:33,480 --> 00:15:36,080
the water is now almost gone.
210
00:15:38,360 --> 00:15:40,240
After six months of flood...
211
00:15:41,360 --> 00:15:44,480
..the desert is reclaiming its sands.
212
00:15:54,960 --> 00:15:57,800
These are the borderlands.
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00:15:58,800 --> 00:16:01,000
Food is scarce.
214
00:16:07,440 --> 00:16:09,280
This barren landscape...
215
00:16:10,400 --> 00:16:14,080
..was once a lush, green place.
216
00:16:14,120 --> 00:16:17,080
(SWELLING ORCHESTRAL MUSIC)
217
00:16:21,200 --> 00:16:24,360
Now there's little more
than rutted dirt.
218
00:16:33,480 --> 00:16:38,440
A lone bull hippo
is left high and dry...
219
00:16:44,640 --> 00:16:47,640
..using the mud to protect his skin
220
00:16:47,680 --> 00:16:49,840
from the beating sun.
221
00:16:53,360 --> 00:16:55,760
But some...
222
00:16:56,760 --> 00:16:59,280
..have been waiting
for this opportunity.
223
00:16:59,320 --> 00:17:01,320
(ETHEREAL MUSIC)
224
00:17:12,760 --> 00:17:14,560
For trapped fish...
225
00:17:16,160 --> 00:17:18,200
..there's no escape.
226
00:17:21,320 --> 00:17:24,840
Pelicans and storks fly in
from afar...
227
00:17:26,360 --> 00:17:29,440
..for a final grisly feast.
228
00:17:38,040 --> 00:17:41,720
Soon, even they'll be forced
to leave.
229
00:17:42,880 --> 00:17:46,320
Unlike the fish,
they have somewhere to go.
230
00:17:48,600 --> 00:17:50,680
(GRUNTING)
231
00:17:52,760 --> 00:17:56,200
Upstream, the hippos
are in better shape.
232
00:17:57,160 --> 00:17:59,120
They don't know what's coming.
233
00:18:00,400 --> 00:18:03,640
Their lagoon is already shrinking...
234
00:18:05,040 --> 00:18:08,680
..and it's causing tempers to flare.
235
00:18:08,720 --> 00:18:10,840
(ROARING)
236
00:18:27,560 --> 00:18:32,320
An old male leaves the stresses
of the water to feed.
237
00:18:33,760 --> 00:18:35,320
(HIPPO SNORTS)
238
00:18:35,360 --> 00:18:39,520
There's still good grazing to be had
around the edges of the lagoon.
239
00:18:41,760 --> 00:18:43,760
But he's not alone;
240
00:18:43,800 --> 00:18:45,760
a young pretender,
241
00:18:45,800 --> 00:18:49,400
eager to find their place
in the pecking order.
242
00:18:50,360 --> 00:18:52,920
The old boy's not impressed.
243
00:18:53,960 --> 00:18:55,760
(ROARS)
244
00:18:58,280 --> 00:19:00,280
(TENSE MUSIC)
245
00:19:07,760 --> 00:19:10,200
He gives a final warning...
246
00:19:10,240 --> 00:19:13,000
(GRUNTING)
247
00:19:13,040 --> 00:19:15,160
(BELLOWING)
248
00:19:15,200 --> 00:19:17,200
(GRUNTING)
249
00:19:23,520 --> 00:19:26,080
..but it's foolishly ignored.
250
00:19:26,960 --> 00:19:29,360
(FIERCE ROARING)
251
00:19:29,400 --> 00:19:31,400
(DRAMATIC MUSIC)
252
00:19:36,720 --> 00:19:38,720
(ROARING)
253
00:19:41,440 --> 00:19:43,960
(BIRD SQUAWKS)
254
00:19:45,440 --> 00:19:49,760
Times can be tough living
in these ever-shifting waters.
255
00:19:51,480 --> 00:19:54,400
Some face the changes head-on.
256
00:19:55,520 --> 00:19:58,120
Others are forced to leave.
257
00:20:14,240 --> 00:20:18,440
In the north of the delta
are its permanent headwaters.
258
00:20:19,640 --> 00:20:21,960
They never dry out.
259
00:20:22,000 --> 00:20:24,080
(WATER BUBBLING)
260
00:20:24,120 --> 00:20:27,760
Millions of fish fry have arrived,
261
00:20:27,800 --> 00:20:30,840
fleeing the receding flood
downstream.
262
00:20:32,480 --> 00:20:36,080
The maze of channels
seems to offer safety.
263
00:20:39,680 --> 00:20:41,360
What they don't know...
264
00:20:42,400 --> 00:20:45,080
..is others are arriving, too.
265
00:20:48,640 --> 00:20:50,440
A barbel.
266
00:20:53,600 --> 00:20:55,440
A voracious predator,
267
00:20:55,480 --> 00:20:58,600
over a metre long.
268
00:20:59,680 --> 00:21:01,280
And it's not alone.
269
00:21:06,000 --> 00:21:08,200
Following along behind...
270
00:21:09,400 --> 00:21:11,440
..are hundreds more.
271
00:21:15,960 --> 00:21:19,200
They scour the creeks
for unwary prey.
272
00:21:20,120 --> 00:21:22,360
The thrashing attracts
other predators.
273
00:21:24,640 --> 00:21:26,320
Egrets.
274
00:21:27,320 --> 00:21:30,960
The fish fry are forced
to run the gauntlet,
275
00:21:31,000 --> 00:21:33,840
above and below.
276
00:21:37,880 --> 00:21:39,880
(OMINOUS MUSIC)
277
00:21:41,080 --> 00:21:43,600
They're trapped.
278
00:21:54,080 --> 00:21:58,440
Gaping mouths
and stabbing beaks are everywhere.
279
00:22:03,640 --> 00:22:05,680
(CHILLING MUSIC)
280
00:22:18,760 --> 00:22:21,080
For the fish
that do make it to safety...
281
00:22:22,400 --> 00:22:25,160
..these permanent waters
offer a lifeline.
282
00:22:27,320 --> 00:22:29,800
They have survived their trial,
283
00:22:29,840 --> 00:22:33,600
but other animals are about
to face their own.
284
00:22:39,880 --> 00:22:41,640
(INSECTS CHIRPING)
285
00:22:51,040 --> 00:22:53,720
On the dry floodplains,
286
00:22:53,760 --> 00:22:55,840
the time has arrived...
287
00:22:57,960 --> 00:22:59,960
..for a magical event.
288
00:23:01,520 --> 00:23:04,200
This is when the termites breed.
289
00:23:05,720 --> 00:23:08,240
A chance to start a colony,
290
00:23:08,280 --> 00:23:11,960
and the first steps
in creating a new island.
291
00:23:13,480 --> 00:23:18,200
The next generation of winged lovers
takes to the air,
292
00:23:18,240 --> 00:23:19,920
looking for a mate.
293
00:23:21,920 --> 00:23:25,280
But it's a hostile world
outside their mound.
294
00:23:27,120 --> 00:23:30,440
As soon as they touch down,
they shed their wings.
295
00:23:32,480 --> 00:23:34,720
They must move quickly.
296
00:23:34,760 --> 00:23:36,640
Exposed on the surface,
297
00:23:36,680 --> 00:23:38,600
they're in danger.
298
00:23:41,360 --> 00:23:45,560
The males begin a frantic search
for pheromone trails...
299
00:23:46,640 --> 00:23:49,320
..chemical messages leading
to the females.
300
00:23:50,680 --> 00:23:54,040
The odds, however,
are stacked against them.
301
00:23:55,560 --> 00:24:00,040
This bumbling protein buffet
is bound to attract attention.
302
00:24:04,800 --> 00:24:06,560
Marabou storks.
303
00:24:07,680 --> 00:24:10,640
The termites are a welcome,
if unexpected...
304
00:24:10,680 --> 00:24:12,320
breakfast.
305
00:24:13,760 --> 00:24:15,760
(QUIRKY MUSIC)
306
00:24:23,520 --> 00:24:28,360
Sand toads wake from hibernation
to join in.
307
00:24:39,560 --> 00:24:43,160
Even ants take care
of the stragglers.
308
00:24:50,560 --> 00:24:55,280
He's avoided being eaten
and found what he hopes will be...
309
00:24:56,280 --> 00:24:57,960
..his new queen.
310
00:24:58,880 --> 00:25:01,480
Now, he must keep up...
311
00:25:02,520 --> 00:25:06,480
..moving as quickly as they can
to find what they're looking for...
312
00:25:10,040 --> 00:25:11,960
..soft ground.
313
00:25:17,720 --> 00:25:20,200
Then, without delay,
314
00:25:20,240 --> 00:25:22,560
they dig their marital burrow...
315
00:25:27,200 --> 00:25:29,760
..which, in the coming years...
316
00:25:31,400 --> 00:25:33,400
could become part...
317
00:25:34,360 --> 00:25:36,760
..of a new Okavango island.
318
00:25:43,920 --> 00:25:46,120
After months of drying out,
319
00:25:46,160 --> 00:25:49,200
the delta is shifting.
320
00:25:49,240 --> 00:25:52,080
Change is on the way.
321
00:25:53,080 --> 00:25:58,560
New floodwater is finally flowing
through its veins once more.
322
00:26:01,280 --> 00:26:03,360
First a trickle.
323
00:26:05,720 --> 00:26:07,640
Then...
324
00:26:07,680 --> 00:26:09,520
a flood.
325
00:26:14,480 --> 00:26:20,920
The water will reclaim over 8,000
square kilometres of desert
326
00:26:20,960 --> 00:26:24,480
and restore thousands of islands.
327
00:26:24,520 --> 00:26:26,520
(TRIUMPHANT MUSIC BUILDS)
328
00:26:42,960 --> 00:26:46,040
With it come animals...
329
00:26:49,200 --> 00:26:50,920
(LOW GROWLING)
330
00:26:50,960 --> 00:26:54,080
(ELEPHANTS SNORTING)
331
00:26:54,120 --> 00:26:56,680
.in their thousands...
332
00:26:56,720 --> 00:26:59,200
(BIRDS CHIRPING AND HONKING)
333
00:26:59,240 --> 00:27:02,320
..making the most of fresh grass.
334
00:27:08,080 --> 00:27:10,080
(UPLIFTING MUSIC)
335
00:27:20,080 --> 00:27:24,960
On Chief's Island,
the flood is back once more.
336
00:27:26,680 --> 00:27:30,240
The rising water
has rebuilt the island.
337
00:27:31,320 --> 00:27:35,080
The hyenas' prime territory
is restored.
338
00:27:41,360 --> 00:27:44,080
There's also been a baby boom.
339
00:27:45,360 --> 00:27:48,800
This couldn't happen
in the borderlands or beyond.
340
00:27:50,320 --> 00:27:52,640
Hungry youngsters are everywhere.
341
00:27:52,680 --> 00:27:54,880
And there are more to come.
342
00:27:57,840 --> 00:27:59,840
The clan queen...
343
00:28:00,920 --> 00:28:02,880
..is also expecting.
344
00:28:05,040 --> 00:28:08,040
With so many extra mouths to feed...
345
00:28:08,960 --> 00:28:12,880
..scavenging is now a full-time job.
346
00:28:21,120 --> 00:28:24,520
Being pregnant doesn't mean
she's excused duties.
347
00:28:28,160 --> 00:28:30,120
So, she sets out,
348
00:28:30,160 --> 00:28:33,320
playing her part
in the search for food.
349
00:28:37,040 --> 00:28:39,080
(SNIFFING)
350
00:28:39,120 --> 00:28:42,000
She's picked up
an unmistakable scent.
351
00:28:42,040 --> 00:28:44,120
(SNIFFING)
352
00:28:44,160 --> 00:28:46,160
(FLIES BUZZING)
353
00:28:46,200 --> 00:28:50,040
Disease has taken its toll
on elephants,
354
00:28:50,080 --> 00:28:53,520
weakened by the long dry season.
355
00:28:53,560 --> 00:28:55,720
(FLIES BUZZING)
356
00:28:55,760 --> 00:28:57,760
It's also attracted...
357
00:28:57,800 --> 00:29:00,360
unwelcome visitors.
(BIRD SQUAWKS)
358
00:29:03,600 --> 00:29:05,560
(SQUAWKING)
359
00:29:05,600 --> 00:29:07,360
Vultures...
360
00:29:07,400 --> 00:29:09,800
(HYENA GROWLS)
(VULTURE SQUAWKS)
361
00:29:11,320 --> 00:29:14,400
..a signal to every predator around
362
00:29:14,440 --> 00:29:16,720
that there's a feast to be had.
363
00:29:21,840 --> 00:29:24,600
An old foe returns.
364
00:29:27,200 --> 00:29:29,200
(LOW GROWLING)
365
00:29:32,960 --> 00:29:34,960
(VULTURES SQUAWK)
366
00:29:37,160 --> 00:29:39,000
(LOW RUMBLING GROWL)
367
00:29:39,040 --> 00:29:41,040
(OMINOUS MUSIC)
368
00:29:56,640 --> 00:30:00,040
If he catches her,
he could easily kill her.
369
00:30:02,600 --> 00:30:04,280
(LION GROWLS)
370
00:30:06,800 --> 00:30:08,960
(VULTURE SQUAWKS)
371
00:30:12,400 --> 00:30:14,600
But she isn't giving up.
372
00:30:16,040 --> 00:30:19,320
Her unborn cubs need her to succeed.
373
00:30:25,200 --> 00:30:27,160
(LION ROARS)
374
00:30:31,600 --> 00:30:34,360
But she doesn't have numbers
on her side...
375
00:30:35,360 --> 00:30:36,880
..yet.
376
00:30:39,880 --> 00:30:43,000
She calls for backup.
(HYENA WHOOPS)
377
00:30:44,360 --> 00:30:46,680
(HYENA WHOOPS)
378
00:30:48,120 --> 00:30:51,360
(HYENA WHOOPING)
379
00:30:51,400 --> 00:30:54,120
Her whoop is a call to arms.
380
00:30:54,160 --> 00:30:56,960
(HYENA WHOOPS)
381
00:30:57,000 --> 00:30:59,320
(HYENA WHOOPING)
382
00:31:04,400 --> 00:31:06,560
Clan Hyena mobilises.
383
00:31:06,600 --> 00:31:08,600
(DRAMATIC MUSIC)
384
00:31:22,560 --> 00:31:26,000
The tables have turned.
385
00:31:31,160 --> 00:31:32,880
(HYENA WHOOPING IN DISTANCE)
386
00:31:32,920 --> 00:31:36,160
Now it's the lion who's in trouble.
387
00:31:40,960 --> 00:31:42,960
(BIRDS CHIRPING)
388
00:31:44,200 --> 00:31:46,160
(HYENA SHRIEKS)
389
00:31:58,200 --> 00:32:00,200
(LION ROARS)
390
00:32:03,480 --> 00:32:05,720
This could have been a bloodbath...
391
00:32:06,960 --> 00:32:09,600
..but the delta
has delivered for both.
392
00:32:10,600 --> 00:32:12,960
There's more than either
could possibly eat.
393
00:32:14,160 --> 00:32:16,160
(HYENAS YIPPING)
394
00:32:17,920 --> 00:32:20,720
In a moment rarely witnessed,
395
00:32:20,760 --> 00:32:24,520
they settle for an uneasy truce.
396
00:32:41,320 --> 00:32:43,320
(HYENAS SLURPING)
397
00:32:46,080 --> 00:32:50,200
The queen of Chief's Island
can feed in safety for now.
398
00:32:55,680 --> 00:32:58,000
And inside her,
399
00:32:58,040 --> 00:33:02,240
the next in line to the island throne
will grow strong.
400
00:33:20,040 --> 00:33:24,840
In the floodplains, returning water
is consuming the land.
401
00:33:31,240 --> 00:33:33,280
Some animals welcome it...
402
00:33:34,400 --> 00:33:36,720
..but it's not good news
for everyone.
403
00:33:38,600 --> 00:33:41,440
It's forcing baboons
to find a new home.
404
00:33:50,120 --> 00:33:53,120
The delta's largest primate,
405
00:33:53,160 --> 00:33:57,120
they must find an island
that can support the family of 15.
406
00:34:03,840 --> 00:34:07,320
If there's one thing
the delta isn't short of now...
407
00:34:08,320 --> 00:34:10,000
..it's islands.
408
00:34:11,000 --> 00:34:14,880
And this one has its own fruit tree.
409
00:34:21,040 --> 00:34:23,440
This is just what they're after.
410
00:34:27,040 --> 00:34:28,720
Figs.
411
00:34:31,480 --> 00:34:34,200
the delta's superfood.
412
00:34:38,880 --> 00:34:43,920
But youngsters are more interested
in their new playground.
413
00:34:47,800 --> 00:34:49,800
(BABY BABOONS CHATTERING)
414
00:34:59,640 --> 00:35:01,640
The baboons can relax...
415
00:35:02,880 --> 00:35:04,840
..but below...
416
00:35:06,520 --> 00:35:09,560
..the termites are on full alert.
417
00:35:09,600 --> 00:35:11,600
(QUEEN TERMITE'S BODY SQUELCHES)
418
00:35:19,080 --> 00:35:23,360
The returning waters threaten
to drown their colony.
419
00:35:23,400 --> 00:35:26,480
They must waterproof their tunnels
420
00:35:26,520 --> 00:35:28,760
before it arrives.
421
00:35:30,800 --> 00:35:33,120
It's a race against time.
422
00:35:34,080 --> 00:35:36,120
But they have another problem...
423
00:35:37,120 --> 00:35:40,160
..one that comes from within
and threatens
424
00:35:40,200 --> 00:35:42,440
to undo all their hard work.
425
00:35:45,240 --> 00:35:48,920
The termites have entered into
a partnership with a white fungus.
426
00:35:50,320 --> 00:35:52,400
They tend and feed it.
427
00:35:53,680 --> 00:35:55,400
In exchange...
428
00:35:56,440 --> 00:36:00,840
..it provides almost
their sole supply of food.
429
00:36:00,880 --> 00:36:04,720
The termites may be doing everything
to stop water coming in...
430
00:36:07,000 --> 00:36:09,440
..but their fungus
is trying to break out,
431
00:36:09,480 --> 00:36:12,440
growing through the tunnels...
432
00:36:17,320 --> 00:36:19,040
..throwing out mushrooms...
433
00:36:21,520 --> 00:36:24,160
..so it can release its spores.
434
00:36:30,000 --> 00:36:35,200
But mushrooms are irresistible
to baboons.
435
00:36:36,240 --> 00:36:40,200
And to get them,
they break open the mound.
436
00:36:43,400 --> 00:36:45,920
The termites swing into action,
437
00:36:45,960 --> 00:36:49,120
sealing the breach from the inside.
438
00:36:50,800 --> 00:36:53,760
(FRENZIED MUSIC)
439
00:36:57,520 --> 00:36:59,880
It will dry hard as rock...
440
00:37:01,560 --> 00:37:05,160
..keeping out the neighbours
and the coming flood.
441
00:37:06,480 --> 00:37:08,800
(WIND WHISTLES)
442
00:37:08,840 --> 00:37:11,280
Some islands are forged
by the earth...
443
00:37:12,240 --> 00:37:14,720
..others by tiny creatures,
444
00:37:14,760 --> 00:37:16,880
but in the headwaters,
445
00:37:16,920 --> 00:37:20,560
it's giant animals
that change entire landscapes.
446
00:37:26,560 --> 00:37:29,520
The water here is deep and permanent.
447
00:37:30,520 --> 00:37:36,960
It's so wet that some of the islands
literally float.
448
00:37:38,080 --> 00:37:43,160
And abundant plant life provides
year-round food for elephants.
449
00:37:44,400 --> 00:37:46,960
(ELEPHANT SNORTS)
450
00:37:49,480 --> 00:37:54,160
This is why they choose
to stay in the delta.
451
00:37:55,640 --> 00:37:58,800
The good times outweigh the bad.
452
00:38:04,320 --> 00:38:07,600
And these massive animals
453
00:38:07,640 --> 00:38:12,160
are capable of causing huge changes
to the delta.
454
00:38:13,240 --> 00:38:15,240
(UPBEAT PERCUSSIVE MUSIC)
455
00:38:20,480 --> 00:38:23,160
Elephants dislodge vegetation...
456
00:38:25,520 --> 00:38:28,320
..which accumulates into rafts...
457
00:38:33,760 --> 00:38:35,800
..growing as they journey.
458
00:38:44,280 --> 00:38:46,040
They can come together...
459
00:38:47,120 --> 00:38:49,760
..to create floating islands.
460
00:38:52,480 --> 00:38:54,200
Hippos then take over.
461
00:38:55,200 --> 00:38:58,280
They crash through vegetation...
462
00:39:01,520 --> 00:39:03,520
..creating channels...
463
00:39:04,840 --> 00:39:07,160
a spiderweb of waterways...
464
00:39:08,280 --> 00:39:10,080
..others can exploit.
465
00:39:26,080 --> 00:39:29,320
The hippos also keep
the lagoons open...
466
00:39:32,400 --> 00:39:36,960
..which allows more delicate plants,
like waterlilies, to grow.
467
00:39:38,160 --> 00:39:40,320
They may only be small,
468
00:39:40,360 --> 00:39:44,760
but these lily pad islands
have a big influence.
469
00:39:45,960 --> 00:39:47,720
The leaves give shade,
470
00:39:47,760 --> 00:39:52,240
helping to keep the water cool
and give cover to fish.
471
00:39:56,840 --> 00:39:59,720
And their flowers offer rich nectar.
472
00:40:06,000 --> 00:40:10,480
The lily pads are home to a bird
that spends its days island hopping.
473
00:40:13,720 --> 00:40:16,600
The jacana, or lily-trotter.
474
00:40:19,440 --> 00:40:22,320
Exceptionally long toes
spread its weight.
475
00:40:25,000 --> 00:40:28,080
It can almost walk on water.
476
00:40:29,560 --> 00:40:32,680
The jacana has evolved
to spend its entire life...
477
00:40:34,680 --> 00:40:37,400
..on these floating islands.
478
00:40:40,040 --> 00:40:42,000
The lilies provide food...
479
00:40:43,400 --> 00:40:46,000
and a place to raise a family.
480
00:40:46,040 --> 00:40:47,880
(CHICK CHEEPING)
481
00:40:49,400 --> 00:40:51,480
(INSECTS BUZZING)
482
00:40:55,200 --> 00:40:57,360
(CHEEPING)
483
00:41:02,320 --> 00:41:05,840
Chicks are brought up
by their single dad.
484
00:41:13,120 --> 00:41:16,040
He has a clever way
of keeping them safe.
485
00:41:16,080 --> 00:41:17,960
(CHICKS CHEEPING)
486
00:41:20,720 --> 00:41:22,200
(HIPPO SNORTS)
487
00:41:22,240 --> 00:41:25,240
He carries them under his wings...
488
00:41:26,200 --> 00:41:28,880
..until they find their feet.
489
00:41:28,920 --> 00:41:31,000
(HIPPO GRUNTING)
490
00:41:31,040 --> 00:41:33,920
But this family is being watched.
491
00:41:33,960 --> 00:41:35,760
(CHICK CHEEPS)
492
00:41:35,800 --> 00:41:38,200
The hippo is not the problem.
493
00:41:38,240 --> 00:41:39,800
(HIPPO GRUNTS)
494
00:41:39,840 --> 00:41:43,560
A rival jacana
is eyeing the territory.
495
00:41:47,720 --> 00:41:52,080
But Dad's not going to let anyone
muscle in on his lilies.
496
00:41:54,760 --> 00:41:57,000
(SQUAWKING)
497
00:41:57,040 --> 00:41:59,840
(FRENZIED SQUAWKING)
498
00:42:05,960 --> 00:42:08,560
Calm restored...
499
00:42:09,800 --> 00:42:12,080
..for now at least.
500
00:42:20,520 --> 00:42:23,840
Chief's Island has come through
for the hyena clan.
501
00:42:25,720 --> 00:42:30,600
Their scavenging adaptations
saw them through the tough times.
502
00:42:31,920 --> 00:42:33,760
So now...
503
00:42:33,800 --> 00:42:35,160
(HYENAS YAPPING)
504
00:42:35,200 --> 00:42:37,280
..they can enjoy the good times.
505
00:42:41,160 --> 00:42:42,920
(CUBS YIPPING)
506
00:42:42,960 --> 00:42:45,440
And their island queen...
507
00:42:46,880 --> 00:42:49,600
..also has a new arrival.
508
00:42:53,400 --> 00:42:56,480
The latest member
of the Chief's Island clan.
509
00:42:59,040 --> 00:43:01,040
(CUB SQUEAKS SOFTLY)
510
00:43:05,680 --> 00:43:08,960
The delta shapes the lives
of every animal
511
00:43:09,000 --> 00:43:12,000
that lives within
its powerful influence.
512
00:43:14,520 --> 00:43:18,920
They respond to its dynamic ebb
and flow of water.
513
00:43:22,200 --> 00:43:24,600
For some...
514
00:43:24,640 --> 00:43:26,640
this brings challenge.
515
00:43:34,520 --> 00:43:36,280
But for others...
516
00:43:37,200 --> 00:43:40,440
..the delta brings great benefits...
517
00:43:43,400 --> 00:43:46,000
..that enable them to prosper.
518
00:43:49,760 --> 00:43:53,360
As long as the distant rains
continue to fall,
519
00:43:53,400 --> 00:43:56,800
this unique world of island...
520
00:43:57,840 --> 00:44:00,360
..will emerge every year...
521
00:44:01,600 --> 00:44:04,000
..from the desert sands.
522
00:44:04,040 --> 00:44:06,040
(EPIC ORCHESTRAL MUSIC)
523
00:44:06,080 --> 00:44:08,200
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