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[David Attenborough] Just 50 years ago,
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we finally ventured to the moon.
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For the very first time,
we looked back at our own planet.
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Since then, the human population
has more than doubled.
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This series will celebrate
the natural wonders that remain
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and reveal what we must preserve
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to ensure people and nature thrive.
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The Earth still has sanctuaries,
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and, on occasion, they hold
spectacular gatherings of wildlife.
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They provide vital space,
but they're disappearing fast.
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[wildebeest lowing]
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A fifth of the land
on our planet is covered by desert.
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The driest of all
is the Atacama in South America.
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There are places here
where rain has never been recorded.
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Deserts may appear to be barren and empty,
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but they are of crucial importance
to life.
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For those that can overcome
their challenges,
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they provide a vital refuge.
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[wind whistling]
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Socotran cormorants,
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emerging from a dust storm
in the Arabian desert.
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It is the very emptiness of this landscape
that has brought them here,
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and they have come in immense numbers.
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[birds squawking]
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Fifty thousand of them.
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A quarter of the total population.
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They have come
because here they can breed...
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undisturbed.
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But nesting in a desert is difficult.
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Temperatures can reach 40 degrees Celsius.
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Yet, both the adults
and their white chicks
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are ready for this challenge.
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[birds panting]
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They cool themselves
by panting.
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Any adult that appears to have food
in its crop is mobbed.
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An adult will only give food
to its own chick,
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which must be here somewhere.
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The chicks chase an adult
out into the desert.
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No luck.
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Now, they must get back quickly
to the safety of the colony.
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This desert provides the cormorants
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with more than just a secure refuge.
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Every morning, a mass movement begins.
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It's the rush hour.
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A shallow arm of the sea,
right beside the colony,
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is full of food.
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[cawing]
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This richness comes
from the desert itself.
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Dust, blown from the land,
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contains nutrients
that fertilize the surrounding waters.
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So, it is the desert itself
that enriches the sea.
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In Oman, during the summer monsoon,
fogs roll in from the sea,
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billowing over the Dhofar mountains.
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The mists bring just enough moisture
to sustain a little vegetation...
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and this sparse greenery
becomes a focus for life.
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Ibex must cross the near vertical cliffs
to reach one of the few springs.
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But they're nervous...
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and with good reason.
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An Arabian leopard,
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one of less than 200
that survive in the wild.
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This male's territory
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extends over 350 square kilometers
of high mountains and deep wadis.
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The southern edge
of the Arabian Peninsula
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is one of the few places left
where there is enough prey
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to sustain a population of these leopards.
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But even so, there are probably
less than 60 individuals
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in over 15,000 square kilometers.
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These leopards have always been rare,
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but now conflict with people
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is causing their numbers
to decline still further.
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[bird chirps]
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Few leopards are left,
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so what our hidden cameras now capture
verges on the miraculous.
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A female leopard,
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and she is tracking a male.
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Such meetings
are becoming increasingly rare.
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[growling]
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This briefest of unions
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may ensure
the short-term future for these leopards.
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But in the longer term,
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their fate will depend
on their territory being protected.
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To the north of the Dhofar mountains
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lies a place
of almost unimaginable emptiness.
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The Rub' al Khali,
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the Empty Quarter.
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The very name of the place
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resonates with the romance
of these desert lands.
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This is the largest sand sea
in the world.
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There are parts
where human beings never venture.
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Only the greatest desert specialists
can survive here.
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Arabian oryx.
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Their ranges are vast,
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extending
for over 3,000 square kilometers.
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This is one of their last refuges.
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Once hunted close to extinction,
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they have now reclaimed
their ancestral territory.
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With the help of conservationists,
they have returned home.
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But reintroduction
cannot save all desert animals.
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[elephants huffing]
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Desert elephants.
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Less than 150 survive, here in Namibia.
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This oldest of deserts
is scarred by dry riverbeds,
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carved by water that flows
for only one or two days in a year.
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An adult elephant
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must find up to 200 kilos of food
each and every day if it's not to starve.
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So, for these last survivors,
life is an endless trek.
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The herd is guided by a single old female,
the matriarch.
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She is leading her family
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to a special place
where food should be available
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even in a drought.
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She learned of its existence
from her mother,
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many years ago.
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Now, she's teaching her own calf
how to get there.
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The elephants are not alone
in their search for food.
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Desert lions.
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They are just as rare as the elephants.
The calf is protected by its mother.
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So the lions let them pass.
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Distant trees are a sign of water.
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[brays]
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The riverbed is dry.
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The ana trees, however, are still green.
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But there is a problem.
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At this time of year,
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seedpods from the ana trees
usually litter the ground.
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Rich food for elephants.
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But this year, the crop has failed.
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The matriarch
has led her herd here for nothing.
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Even the trees' leafy branches
are out of their reach.
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The family has no option but to move on.
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A bull, standing nearly four meters tall.
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He can reach into the canopy,
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and he could be the solution
to their problem.
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The old female has known him all her life
and turned to him for help before.
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Elephants can only survive here
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because of knowledge
passed down over generations.
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But less than 20 matriarchs still survive,
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and if their knowledge is lost,
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elephants may no longer
be able to live here.
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Deserts cannot support
large numbers of animals the year round,
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and even those specially adapted
to these conditions
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can only survive in small numbers.
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But on very special occasions,
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deserts are transformed.
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[thunder rumbling]
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Once in a decade,
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there may be a cloudburst.
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A single one can turn the desert green.
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In southern California,
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the change is visible from space.
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Hundreds of square kilometers
suddenly bloom.
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If such transformations become regular,
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a new habitat may develop.
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Grasslands.
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One of our planet's
most productive landscapes.
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They support the greatest aggregations
of large animals on Earth.
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The Serengeti sustains herds
of over a million wildebeest.
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They follow the rains
to crop the newly sprung grass.
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These vast herds attract predators.
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Five male cheetahs.
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One of the largest coalitions
ever observed.
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They dominate a territory
of 450 square kilometers.
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They patrol it together,
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and that attracts attention.
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[birds chirruping]
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[braying]
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A change of strategy is needed
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if they're to hunt successfully.
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They need cover.
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An adult wildebeest
is a formidable opponent.
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Four of the cheetahs start the stalk,
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walking directly towards the prey.
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The fifth creeps around the side.
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They need to get really close
before making their final sprint.
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They're nearly there.
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All five break cover,
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each cat chasing a different target.
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It's chaos.
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A single cheetah
is not strong enough to defend its prize.
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They must work together.
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These dramas only continue
because the Serengeti is protected,
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and has been for over 65 years.
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But the Serengeti is an exception.
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Across the planet, space for grasslands
has been steadily disappearing.
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[huffs]
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A hundred and eighty years ago,
herds of bison, millions strong,
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grazed the Great Plains
of North America.
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They roamed across a prairie
a hundred times larger than the Serengeti.
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This was the true wild west.
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[roaring]
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Every summer,
the males roared their challenges
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and fought for possession of the females.
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As the rut intensified,
the fights became more brutal.
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Today, however,
most of the prairie is silent.
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Humans slaughtered the great herds.
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Less than 30,000 wild bison remain,
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and 90 percent of the prairie
has been lost,
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most of it to agriculture.
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What we eat, and how we produce it,
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will determine the future
of our planet's grasslands.
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Our past could show us
how we can feed ourselves
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and still leave room for nature.
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The ancient hay meadows of Hungary,
still farmed in the traditional way,
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provide habitats
of extraordinary richness.
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Butterflies are abundant.
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One species has
an almost unbelievably complex life cycle.
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The Alcon blue.
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Each female must mate and lay eggs
on just one species of plant,
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the marsh gentian.
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The eggs soon hatch into caterpillars.
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High up on the plants,
they're safe from predators below.
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But then, the caterpillars
do something seemingly suicidal.
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They abseil down on threads of silk
to the ground below...
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and into danger.
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They have no defense
against the marauding ants,
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which carry them off.
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00:34:44,291 --> 00:34:48,462
But this is exactly what the caterpillars
need to happen.
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They're producing a scent
like that emitted by an ant larva.
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The ants respond
by taking them back to their nest.
There, they deposit them
in the colony's brood chamber.
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00:35:17,408 --> 00:35:21,912
The purple-colored caterpillars,
lying among the ants' own white larvae,
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give off just the right signals.
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And the nurse ants rush to feed them.
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But there is more.
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The caterpillars now start to mimic
the sounds made by the queen ant,
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and, as a result,
the ants treat them like royalty.
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If food gets short,
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the ants will even feed the caterpillars
instead of their own young.
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They give them such quantities of food
that the caterpillars grow hugely.
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And there, underground, the caterpillars
feed and grow for nearly two years.
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Until, one day,
there is nothing for the ants to feed.
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The caterpillars have pupated.
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But a few weeks later,
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out crawls an Alcon blue butterfly.
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Now, they begin to leave the nest
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that has been their home
for the last 23 months.
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The young adult
makes its way out of the nest
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and clambers up a grass stem.
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Its wings expand
as it prepares to fly off and find a mate.
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This complex life
may be laborsaving for the butterfly,
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but it's risky.
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If anything happened to the ants
or to the gentian,
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the Alcon blue would become extinct.
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Only tiny fragments
of these ancient meadows
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are left in Europe.
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But beyond them to the east,
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once stretched grasslands that extended
for a fifth of the way around the world,
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from Romania to China.
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Here, there are places where,
for mile after endless mile,
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there are no roads or fences.
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Here, where there are no trees,
eagles nest on the ground.
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Once, these eagles would have preyed
on antelope that numbered in millions.
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And some are still here.
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These are saiga, antelope that live
nowhere else in the world.
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00:39:46,051 --> 00:39:49,304
Their extraordinary noses
are specially adapted
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00:39:49,513 --> 00:39:53,308
to filter out the dust kicked up
by the immense herds
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00:39:53,475 --> 00:39:54,643
that once lived here.
256
00:39:58,355 --> 00:40:00,858
Now, they're critically endangered.
257
00:40:01,692 --> 00:40:06,155
Poaching and the loss of habitat
have had a devastating impact on them.
258
00:40:09,491 --> 00:40:13,537
But conservation efforts have recently
started to make a difference.
259
00:40:16,081 --> 00:40:20,711
There is still hope
for these extraordinary plains dwellers.
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00:40:28,510 --> 00:40:33,223
And the proof of this
can be found further east, in Mongolia,
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00:40:33,849 --> 00:40:37,519
where the grasslands
still remain largely intact.
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00:40:43,150 --> 00:40:45,736
These are Przewalski’s horses.
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00:40:47,154 --> 00:40:50,240
Fifty years ago,
they were extinct in the wild,
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00:40:51,241 --> 00:40:54,119
but a few adults survived in captivity.
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00:41:00,292 --> 00:41:03,712
Careful breeding from 12 of them
increased their numbers
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00:41:03,962 --> 00:41:07,007
until there were sufficient
to release on the plains.
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00:41:09,801 --> 00:41:11,929
These are their descendants.
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00:41:22,064 --> 00:41:24,983
A stallion protects each harem.
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00:41:29,613 --> 00:41:34,326
They must be vigilant,
and they race to defend their herd...
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00:41:43,544 --> 00:41:46,672
or chase off bachelors
trying to lure away a mare.
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00:42:01,311 --> 00:42:03,730
With their numbers now topping 300,
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00:42:05,148 --> 00:42:08,694
the future for these wild horses
looks more secure.
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00:42:12,906 --> 00:42:15,033
Their recovery was only possible
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00:42:15,450 --> 00:42:20,706
because the vast Mongolian steppe
still remains largely untouched.
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00:42:33,260 --> 00:42:39,349
These grasses are some of the tallest
to be found anywhere on our planet.
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00:42:42,769 --> 00:42:47,357
They're so tall
they can conceal elephants.
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00:42:56,408 --> 00:43:00,329
They make the giants that live among them
seem small.
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00:43:19,348 --> 00:43:21,266
A last hiding place
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00:43:21,350 --> 00:43:25,729
for the highly endangered
greater one-horned rhino.
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00:43:36,531 --> 00:43:38,033
This is India,
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00:43:39,785 --> 00:43:42,329
one of the most populous countries
on Earth.
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00:43:45,332 --> 00:43:51,463
Yet here there is a great determination
to protect these crucial grasslands.
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00:44:06,645 --> 00:44:08,188
What must it be like
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00:44:08,438 --> 00:44:12,234
to live in this dense,
claustrophobic world?
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00:44:21,952 --> 00:44:26,039
Just moving about
could mean walking into danger.
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00:44:41,722 --> 00:44:46,351
The grasses conceal tigers.
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00:44:57,112 --> 00:45:00,615
Stripes and shadows blend.
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00:45:14,588 --> 00:45:18,967
Long grass
may hide a tigress from her prey,
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00:45:25,015 --> 00:45:28,852
but it also hides the prey from her.
290
00:45:37,277 --> 00:45:40,489
She must get within 20 meters of it.
291
00:45:46,661 --> 00:45:51,583
And she must always know
exactly where the prey are hidden.
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00:46:42,843 --> 00:46:44,636
She may have lost them.
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00:47:06,950 --> 00:47:09,160
She risks a look.
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00:47:13,039 --> 00:47:14,165
[bleats]
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00:47:17,586 --> 00:47:19,588
[bleating resonates]
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00:47:38,356 --> 00:47:44,446
Every deer around
now knows exactly where the tiger is.
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00:47:58,793 --> 00:48:02,756
Others have heard the signal
that announced her failure.
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00:48:11,890 --> 00:48:12,849
Her cubs.
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00:48:22,609 --> 00:48:25,278
She had left them hidden in the grass.
300
00:48:28,657 --> 00:48:29,991
[growling]
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00:48:39,668 --> 00:48:41,753
In the last hundred years,
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00:48:42,128 --> 00:48:47,842
the number of wild tigers
has declined by over 95 percent.
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00:48:51,596 --> 00:48:53,014
But here in India,
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00:48:53,765 --> 00:48:56,476
despite the enormous pressure
from poaching,
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00:48:57,560 --> 00:48:59,604
and a growing human population,
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00:49:01,106 --> 00:49:04,109
tiger numbers are actually increasing.
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00:49:13,493 --> 00:49:18,623
Protect the precious space
that grasslands and deserts provide,
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00:49:21,209 --> 00:49:24,212
and the animals will bounce back.
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00:49:40,562 --> 00:49:42,772
Please visit ourplanet.com
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00:49:43,106 --> 00:49:47,944
to discover what we need to do now
to protect wild grasslands.
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00:49:49,988 --> 00:49:55,869
♪ I can hear the whole world
Singing together ♪
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00:49:58,496 --> 00:50:04,461
♪ I can hear the whole world
Say it's now or never ♪
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00:50:07,255 --> 00:50:11,551
♪ 'Cause it's not too late
If we change our ways ♪
314
00:50:11,634 --> 00:50:15,096
♪ And connect the dots to our problems ♪
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00:50:15,513 --> 00:50:21,186
♪ I can hear the whole world
Say we're in this together ♪