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[NBC chime]
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NARRATOR: The story
of life on Earth...
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[roars]
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...has been marked by a series
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of catastrophic
extinction events.
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Natural disasters, which have
threatened to wipe out
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many of the creatures
that call our planet home.
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But after each brush with death,
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life has come back
even stronger.
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[majestic music]
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One such event occurred
two and half million years ago,
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in the Americas.
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Up until then, North and South
America had been separated
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by ocean.
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[trumpeting]
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But then, the seabed rose up,
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and a land bridge formed.
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[snarling]
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♪♪♪
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For the first time,
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animals and plants from these
two completely different worlds
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would face off.
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[squawks]
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Many were driven to extinction.
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-[growling]
-[screeching]
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But for others,
it was a whole new beginning.
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-[trumpeting]
-[screeching]
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[growling]
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[trumpeting]
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[majestic music]
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[low grunting]
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It changed life
in the Americas forever.
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[theme music]
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[wind gusts howl]
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[reverent music]
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NARRATOR: Long after the time
of the dinosaurs,
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and more than two million years
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before modern humans
walk the earth,
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the world is becoming
drier and cooler.
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In Central America,
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the climate shift is extreme.
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A punishing drought has gripped
these lands for six months.
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♪♪♪
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To survive here,
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it takes a special
kind of animal.
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[snuffling]
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Like these majestic
Gomphotheres.
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[low, rumbling grunts]
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Descended from
ancient elephant species
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that originally migrated
out of Africa,
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these creatures have made
North America their home.
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[trumpeting]
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Today, they are celebrating.
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[trumpeting]
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A little female calf,
only hours old.
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[trumpeting]
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Her mom is the 40-year-old
matriarch.
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She is the leader of this herd.
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[trumpeting]
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[grunting]
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She doesn‘t have the strength
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to join the celebration.
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♪♪♪
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[trumpeting]
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Exhausted after giving birth,
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she looks for a place
to be alone.
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[screeching]
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As matriarch, she is key
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to the whole herd‘s survival,
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so it is not surprising
her behavior
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is starting to make
them anxious.
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Something extremely rare
has happened.
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[high-pitched trumpeting]
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[gentle music]
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The matriarch
has given birth to a twin.
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♪♪♪
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[trumpeting]
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Brother and sister meet.
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It is a moment of pure joy.
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[high-pitched trumpeting]
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The entire herd
is elated with the arrival
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of its newest members.
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[herd trumpeting]
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[tense music]
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When night comes,
the mood changes.
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Despite an exhausting day,
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it is the new mom
who bravely stands guard
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while the rest
of the herd sleeps.
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As an experienced matriarch,
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one of her duties
is to keep the others safe.
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♪♪♪
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And it‘s a good thing,
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because tonight,
there is danger,
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lurking in the darkness.
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[snarling growls]
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Smilodon.
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Ruthless sabretooth cats,
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as big as jaguars.
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♪♪♪
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They’ve picked up the scent
of the new calves.
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♪♪♪
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[tense music builds]
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At three and a half tons,
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these adult Gomphotheres are too
big for Smilodon to take down.
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[snarling]
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But with a surprise attack...
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they could separate
one of the calves,
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and go in for the kill.
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[clattering]
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[birds cawing]
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[trumpeting]
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[snarling]
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Well, it‘s no longer a surprise.
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[roars]
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Changing tactics,
they go straight for the herd.
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[dramatic music]
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-[trumpeting]
-[snarling]
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If they cause enough chaos,
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one of the babies
will be exposed.
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[high-pitched trumpeting]
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-[roaring]
-[trumpeting]
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Led by the matriarch,
the adults hold the line...
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for now.
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But the sabretooths
have got all night.
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-[roaring]
-[trumpeting]
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It‘s rare for twin
calves to both survive
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their first year
in this harsh land.
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But can they even survive
their first night?
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[roaring]
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[tense music]
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NARRATOR: The moon sets
over Central America,
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two and a half
million years ago.
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♪♪♪
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It is a land gripped
by a severe drought.
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[snarling]
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During the night,
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a herd of American elephants
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have been targeted
by sabretooth predators,
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drawn by the smell
of newborn twin calves.
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[high-pitched trumpeting]
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[trumpeting]
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[snarling]
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[gentle music]
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NARRATOR: In the morning light,
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the matriarch
triumphantly reveals
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all the members
of her herd survived.
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[gentle music]
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Most importantly,
her two babies.
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♪♪♪
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They didn‘t go unscathed.
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Both the little male,
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and his mother were injured.
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But there‘s no time to rest.
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The drought makes
our matriarch‘s top priority
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to find water for the herd.
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[dramatic music]
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She knows a place
where her own mother
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took her, decades ago.
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It might seem dry,
but if you know where to look,
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there are underground springs.
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[suspenseful music]
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There’s barely a trickle.
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[low grunting]
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She is distressed.
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Her home range has failed her,
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and she has failed her herd.
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She must find water.
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[reverent music]
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It is all down to the very land
she is standing on.
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Before now,
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the continents
of North and South America
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were completely separate
land masses.
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♪♪♪
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But continental drift
has been pushing them
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on a collision course
over millions of years.
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Now, they are almost touching.
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♪♪♪
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Ocean currents are rerouting,
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and the climate
in Central America
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is getting steadily drier.
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[wind gusts howl]
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As the dry seasons get longer,
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reliable water sources
disappear,
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and animals suffer.
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These Gomphotheres can normally
survive for days without water.
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But with two calves to feed,
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this new mother needs
to find a solution, fast.
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[high-pitched trumpeting]
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Another mother
in the herd has already
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lost her calf to this drought.
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[babies trumpeting]
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Staying here, with no water,
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would mean certain death
for her two babies.
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[trumpeting]
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But then, our matriarch
feels something
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in the ground.
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Through thick pads on her feet,
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she can sense vibrations.
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From experience,
she knows what this is.
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Distant thunderstorms.
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[joyful music]
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The promise of rain pushes
her to take a huge risk.
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[trumpeting]
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[thud, echoes]
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[low grunting]
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[majestic music]
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She decides to leave
her ancestral lands,
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and lead her herd south.
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00:12:55,983 --> 00:13:00,529
These American elephants can
walk over 100 miles in a day,
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but they are traveling
into the unknown.
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The lands to the south
are even more inhospitable
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than their home territory.
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♪♪♪
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Even the creatures they meet
will be alien to them.
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00:13:18,589 --> 00:13:21,676
The gamble she‘s taking
could be disastrous
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for her new babies,
and for the whole herd.
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[high-pitched trumpeting]
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[trumpeting]
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00:13:32,811 --> 00:13:36,858
[reverent music]
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NARRATOR: The matriarch
of a herd of Gomphotheres
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00:13:39,610 --> 00:13:42,530
has decided to migrate
in search of water.
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00:13:44,865 --> 00:13:48,619
Desperate, she is leading
her herd further south
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than any American elephants
have ever been.
224
00:13:53,373 --> 00:13:57,253
And so far,
it is only getting drier.
225
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[suspenseful music]
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When the matriarch‘s young son
wanders away from the herd,
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he encounters something
he‘s never seen before.
228
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-[grunting]
-[trumpeting]
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00:14:18,941 --> 00:14:21,277
[braying]
230
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An armored Glyptotherium.
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00:14:26,031 --> 00:14:28,576
Definitely not a creature
from around here.
232
00:14:29,451 --> 00:14:33,331
In fact,
he‘s from another world...
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the island continent
of South America.
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00:14:37,501 --> 00:14:39,128
[trumpets]
235
00:14:40,879 --> 00:14:45,509
[whimsical music]
236
00:14:46,885 --> 00:14:49,305
Somehow, he‘s crossed
into the north.
237
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[grunting]
238
00:14:53,433 --> 00:14:54,685
[braying]
239
00:14:55,185 --> 00:14:56,729
He doesn‘t smell dangerous.
240
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[trumpeting]
241
00:15:00,983 --> 00:15:02,902
Maybe this odd-looking animal
242
00:15:02,943 --> 00:15:04,194
could be a playmate.
243
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[trumpeting]
244
00:15:08,865 --> 00:15:10,326
[high-pitched trumpeting]
245
00:15:13,161 --> 00:15:14,455
[screeching]
246
00:15:14,496 --> 00:15:17,583
[low trumpeting]
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00:15:18,834 --> 00:15:20,962
The mother who lost her own baby
248
00:15:21,003 --> 00:15:22,338
comes to the rescue.
249
00:15:24,006 --> 00:15:25,091
[baby screeching]
250
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[dramatic music]
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00:15:27,968 --> 00:15:29,762
[braying]
252
00:15:31,013 --> 00:15:33,057
[low trumpeting]
253
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It‘s nice to be part of a herd.
254
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[trumpeting]
255
00:15:40,897 --> 00:15:43,442
The little one is a bit bruised,
256
00:15:43,483 --> 00:15:45,569
but his instincts were right.
257
00:15:50,198 --> 00:15:53,744
The herd has nothing to fear
from these strangers.
258
00:15:53,785 --> 00:15:58,666
[whimsical music]
259
00:15:59,541 --> 00:16:01,794
[braying]
260
00:16:01,835 --> 00:16:04,005
Although, the Glyptotherium
aren‘t used
261
00:16:04,046 --> 00:16:07,633
to creatures powerful enough
to turn them on their backs.
262
00:16:09,217 --> 00:16:10,511
[braying]
263
00:16:13,513 --> 00:16:17,726
For them, this new,
dry world is proving tough.
264
00:16:20,062 --> 00:16:23,858
[dramatic music]
265
00:16:23,899 --> 00:16:27,111
The desperate herd
is also struggling.
266
00:16:29,988 --> 00:16:32,408
They haven‘t drunk now for days.
267
00:16:33,784 --> 00:16:36,620
But our matriarch
is sticking with her plan,
268
00:16:37,079 --> 00:16:39,498
so she steps up the pace.
269
00:16:39,873 --> 00:16:41,166
[bird screeching]
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00:16:46,838 --> 00:16:48,924
They persevere for days.
271
00:16:48,965 --> 00:16:55,097
♪♪♪
272
00:16:58,475 --> 00:17:01,311
Perhaps this was a mistake.
273
00:17:03,146 --> 00:17:06,608
For the new calves,
the pace is punishing,
274
00:17:07,359 --> 00:17:10,154
but something
even worse is happening.
275
00:17:11,113 --> 00:17:12,865
[low grunting]
276
00:17:13,949 --> 00:17:16,869
Their mother‘s wound
is badly infected,
277
00:17:16,910 --> 00:17:19,747
and she is growing weaker
with every step.
278
00:17:21,289 --> 00:17:28,297
♪♪♪
279
00:17:33,468 --> 00:17:36,472
She made the decision
to take them south,
280
00:17:36,513 --> 00:17:39,934
but now, exhaustion
and her infected wound
281
00:17:39,975 --> 00:17:43,353
are making it impossible
for this matriarch to lead.
282
00:17:45,105 --> 00:17:46,648
She can barely walk.
283
00:17:47,774 --> 00:17:52,321
[solemn music]
284
00:18:00,745 --> 00:18:02,790
She knows her time has come.
285
00:18:03,415 --> 00:18:06,668
[herd trumpeting]
286
00:18:15,051 --> 00:18:18,973
Her herd try to help
their leader back to her feet.
287
00:18:19,014 --> 00:18:23,519
♪♪♪
288
00:18:23,560 --> 00:18:26,188
But she’s reached the end
of her journey.
289
00:18:28,106 --> 00:18:29,900
[trumpeting]
290
00:18:32,194 --> 00:18:36,240
And her death could
mean the death of her twins.
291
00:18:36,823 --> 00:18:40,494
[herd trumpeting]
292
00:18:45,332 --> 00:18:51,213
♪♪♪
293
00:18:55,008 --> 00:18:59,888
NARRATOR: The next morning,
the herd has no leader.
294
00:19:01,223 --> 00:19:04,518
But then, something
remarkable happens.
295
00:19:05,977 --> 00:19:10,024
The mother who lost
her own calf still has milk.
296
00:19:10,065 --> 00:19:13,235
[poignant music]
297
00:19:14,361 --> 00:19:16,446
[grunting]
298
00:19:18,240 --> 00:19:19,491
[high-pitched trumpeting]
299
00:19:20,450 --> 00:19:23,579
She is now the new matriarch.
300
00:19:24,871 --> 00:19:27,749
And following in the footsteps
of her predecessor,
301
00:19:29,084 --> 00:19:32,087
she starts to lead
the herd south again.
302
00:19:32,128 --> 00:19:36,925
♪♪♪
303
00:19:38,760 --> 00:19:42,723
Finally, rolling clouds
on the horizon.
304
00:19:44,849 --> 00:19:47,644
It looks like our old
matriarch was right.
305
00:19:49,187 --> 00:19:52,858
Her legacy will be
the herd‘s survival.
306
00:19:52,899 --> 00:19:57,780
♪♪♪
307
00:19:57,821 --> 00:20:00,616
There‘s the smell
of water in the air.
308
00:20:03,660 --> 00:20:07,373
But it’s not like any water
they’ve smelled before.
309
00:20:07,414 --> 00:20:12,169
[majestic music]
310
00:20:12,210 --> 00:20:13,629
It’s the ocean.
311
00:20:14,963 --> 00:20:18,926
This is where the Atlantic
meets the Pacific.
312
00:20:20,552 --> 00:20:23,138
For the last 50 million years,
313
00:20:23,179 --> 00:20:25,849
this would have been the end
of their journey.
314
00:20:26,850 --> 00:20:30,312
Now, as the American
continents collide,
315
00:20:31,146 --> 00:20:35,442
there is the promise of a
whole new land on the horizon.
316
00:20:35,483 --> 00:20:37,903
[waves splashing]
317
00:20:37,944 --> 00:20:42,366
But the journey there will test
this herd to its limits.
318
00:20:42,407 --> 00:20:43,784
[dramatic music]
319
00:20:49,706 --> 00:20:52,001
NARRATOR:
After an epic migration
320
00:20:52,042 --> 00:20:54,211
the new matriarch
has brought her herd
321
00:20:54,252 --> 00:20:57,047
to the southern most tip
of North America.
322
00:20:57,881 --> 00:21:00,717
Before them lies South America
323
00:21:01,760 --> 00:21:03,846
a continent
that has been isolated
324
00:21:03,887 --> 00:21:07,140
for the last 50 million years.
325
00:21:14,647 --> 00:21:18,527
In between stretches miles
of shallow sea,
326
00:21:18,568 --> 00:21:20,571
crisscrossed with sand banks
327
00:21:20,612 --> 00:21:23,407
and deep channels
in all directions,
328
00:21:24,741 --> 00:21:28,412
Here, they face an ocean
for the first time.
329
00:21:28,453 --> 00:21:30,748
[Gomphotheres grunting]
330
00:21:30,789 --> 00:21:34,418
The new environment
makes the herd nervous.
331
00:21:36,419 --> 00:21:40,090
For the innocent calves,
it’s a fun day at the beach.
332
00:21:42,133 --> 00:21:47,806
[Gomphotheres squeaking
and grunting]
333
00:21:58,525 --> 00:22:01,570
Their new leader can tell
the water isn’t drinkable.
334
00:22:01,611 --> 00:22:04,198
[Gomphothere growling]
335
00:22:04,239 --> 00:22:07,868
Then, she picks up
the unmistakable scent
336
00:22:07,909 --> 00:22:12,247
of lush vegetation floating
on a southerly breeze.
337
00:22:12,288 --> 00:22:17,085
Ahead, lies the island continent
of South America.
338
00:22:18,461 --> 00:22:21,590
Except, it’s no longer
an island.
339
00:22:23,675 --> 00:22:26,387
2.5 million years ago,
340
00:22:26,428 --> 00:22:30,557
continental drift is pushing
it so close to North America
341
00:22:30,598 --> 00:22:34,811
that a series of new islands
are forming a strip of land.
342
00:22:37,564 --> 00:22:39,191
To find fresh water,
343
00:22:39,232 --> 00:22:42,819
all the matriarch has
to do is follow her nose.
344
00:22:43,695 --> 00:22:46,114
So, she continues
the journey south.
345
00:22:57,584 --> 00:23:02,214
But she is unaware
the land bridge they are on
346
00:23:02,255 --> 00:23:04,633
only exists at low tide.
347
00:23:04,674 --> 00:23:06,802
[dramatic music]
348
00:23:16,686 --> 00:23:19,815
Now, the tide is coming in.
349
00:23:25,278 --> 00:23:29,032
The herd is trapped,
surrounded by water.
350
00:23:32,660 --> 00:23:35,831
[Gomphotheres groaning]
351
00:23:36,748 --> 00:23:40,585
Gomphotheres are
naturally good swimmers,
352
00:23:42,045 --> 00:23:44,882
but fighting tides and
unpredictable currents
353
00:23:44,923 --> 00:23:47,759
is much harder
than crossing a river.
354
00:23:57,018 --> 00:23:59,688
They all struggle
to stay together.
355
00:24:09,572 --> 00:24:12,576
The little female calf
is pulled by the tide.
356
00:24:12,617 --> 00:24:14,286
[calf crying]
357
00:24:14,327 --> 00:24:17,372
The new matriarch
can do nothing to help her.
358
00:24:17,413 --> 00:24:22,127
[Gomphotheres crying]
359
00:24:31,886 --> 00:24:35,015
[Gomphotheres groaning]
360
00:25:01,874 --> 00:25:05,295
NARRATOR:
Exhausted and disoriented,
361
00:25:05,336 --> 00:25:08,965
they find themselves
on a new continent:
362
00:25:10,466 --> 00:25:12,010
South America.
363
00:25:15,805 --> 00:25:17,974
But at what cost?
364
00:25:26,816 --> 00:25:31,279
[Gomphothere trumpeting]
365
00:25:47,170 --> 00:25:50,382
A miracle arrives
on the high tide.
366
00:25:53,009 --> 00:25:55,095
It‘s his sister!
367
00:25:56,554 --> 00:26:00,642
In her young life
she‘s overcome so much already.,
368
00:26:00,683 --> 00:26:04,938
And now she‘s even managed
to survive the rough sea.
369
00:26:04,979 --> 00:26:08,024
[Gomphotheres trumpeting]
370
00:26:21,537 --> 00:26:24,874
Finally, a new world.
371
00:26:38,554 --> 00:26:42,726
This part of South America is
less affected by the drought,
372
00:26:42,767 --> 00:26:46,396
with plenty of fresh water
and dense vegetation.
373
00:26:48,690 --> 00:26:51,693
Yet, for the herd
and their matriarch,
374
00:26:51,734 --> 00:26:54,070
nothing is familiar here.
375
00:26:55,613 --> 00:26:58,283
New scents hang in the air.
376
00:26:58,324 --> 00:27:02,078
There are strange
varieties of fruits.
377
00:27:06,249 --> 00:27:09,002
Even the birdsongs
are new to their ears.
378
00:27:20,054 --> 00:27:23,558
Here, they are the aliens
379
00:27:24,726 --> 00:27:28,897
and they have no idea
who they‘ll encounter.
380
00:27:35,445 --> 00:27:38,114
[animal growling]
381
00:27:39,866 --> 00:27:44,287
This ancient land has been
isolated for so long,
382
00:27:44,328 --> 00:27:46,748
[bird squawking]
383
00:27:46,789 --> 00:27:48,417
it has had plenty of time
384
00:27:48,458 --> 00:27:52,420
to evolve
its own terrifying predators.
385
00:27:59,093 --> 00:28:00,637
NARRATOR:
The herd of gomphotheres
386
00:28:00,678 --> 00:28:04,391
have made the impossible journey
across the tidal isthmus
387
00:28:04,432 --> 00:28:07,435
that connects North
and South America.
388
00:28:09,312 --> 00:28:11,523
Everything is new to them.
389
00:28:12,982 --> 00:28:15,152
These are
the sights and sounds
390
00:28:15,193 --> 00:28:17,779
of a completely
unfamiliar world.
391
00:28:17,820 --> 00:28:19,072
[birds trilling]
392
00:28:19,113 --> 00:28:22,659
[animals growling]
393
00:28:22,700 --> 00:28:27,414
Almost immediately, a strange
call echoes around them.
394
00:28:29,707 --> 00:28:33,044
It comes from
an enormous creature.
395
00:28:37,215 --> 00:28:40,635
Luckily, he‘s only
interested in the fruit.
396
00:28:42,261 --> 00:28:44,556
A Giant sloth.
397
00:28:45,348 --> 00:28:47,642
One of the wonders
of South America
398
00:28:47,683 --> 00:28:50,603
two and a half
million years ago.
399
00:28:52,730 --> 00:28:55,317
Even bigger
than the gomphotheres,
400
00:28:55,358 --> 00:28:57,736
they evolved during
the continent‘s
401
00:28:57,777 --> 00:29:00,321
50 million years of isolation.
402
00:29:04,367 --> 00:29:08,205
The matriarch leads them
deeper into this new world.
403
00:29:08,246 --> 00:29:10,707
Her role is to protect
the herd
404
00:29:10,748 --> 00:29:14,919
but she has no idea
who‘ll they‘ll meet next.
405
00:29:18,256 --> 00:29:21,968
For now, there is
no sign of predators.
406
00:29:23,928 --> 00:29:26,431
A herd of toxodons.
407
00:29:31,143 --> 00:29:35,440
Thousands of these one-ton
beasts graze these plains.
408
00:29:37,233 --> 00:29:39,528
And with so much
vegetation around,
409
00:29:39,569 --> 00:29:42,447
they have no problem sharing.
410
00:29:43,322 --> 00:29:47,202
So far, South America
seems like paradise.
411
00:29:51,205 --> 00:29:53,416
[bird trilling]
412
00:29:54,375 --> 00:29:59,047
Suddenly, a piercing call sends
the toxodons into a panic.
413
00:30:01,799 --> 00:30:06,596
[birds squawking]
414
00:30:11,309 --> 00:30:14,729
South America‘s Terror Bird.
415
00:30:16,480 --> 00:30:18,650
These seven-foot
super-predators
416
00:30:18,691 --> 00:30:21,611
can run at over
25 miles an hour.
417
00:30:32,496 --> 00:30:34,541
They start
to flush out the weak.
418
00:30:39,128 --> 00:30:40,839
[Gomphothere trumpeting]
419
00:30:40,880 --> 00:30:45,385
Until, they spot
unexpected visitors.
420
00:30:51,807 --> 00:30:57,355
[bird squawking]
421
00:31:00,149 --> 00:31:03,528
[Gomphothere groaning]
422
00:31:04,278 --> 00:31:08,366
Our matriarch knows
it‘s time for her to step up.
423
00:31:08,407 --> 00:31:10,743
[Gomphothere trumpeting]
424
00:31:12,828 --> 00:31:15,874
The birds assess
these new creatures.
425
00:31:17,083 --> 00:31:20,795
They have never seen
an elephant of any kind before.
426
00:31:27,635 --> 00:31:32,265
But, in this land,
everything is prey to them.
427
00:31:33,391 --> 00:31:35,226
[Gomphothere grunting]
428
00:31:40,898 --> 00:31:42,025
[bird squawking]
429
00:31:42,066 --> 00:31:44,110
They select their target.
430
00:31:53,953 --> 00:31:56,122
[Gomphothere trumpeting]
431
00:31:57,999 --> 00:31:59,292
[bird squawking]
432
00:32:00,501 --> 00:32:02,045
[Gomphothere trumpeting louder]
433
00:32:02,086 --> 00:32:04,380
[bird squawking]
434
00:32:14,348 --> 00:32:18,770
[bird crying]
435
00:32:20,187 --> 00:32:21,522
[bones snapping]
436
00:32:23,691 --> 00:32:25,610
[bird squawking]
437
00:32:26,318 --> 00:32:27,862
Not today.
438
00:32:39,790 --> 00:32:44,629
Our new matriarch secured her
place as leader of the herd.
439
00:32:48,799 --> 00:32:51,636
And stamped her mark
on this new continent.
440
00:32:53,345 --> 00:32:55,139
They‘ve finally made it.
441
00:32:55,973 --> 00:32:59,811
In a land where no predators
can threaten the adults,
442
00:32:59,852 --> 00:33:03,231
the gomphotheres’
future looks bright.
443
00:33:06,942 --> 00:33:09,696
But this is only the beginning.
444
00:33:14,158 --> 00:33:16,119
More species are moving south
445
00:33:16,994 --> 00:33:18,955
and it is not
just the herbivores
446
00:33:18,996 --> 00:33:21,332
discovering this new continent.
447
00:33:22,666 --> 00:33:27,047
Predators from the north
have also made the crossing
448
00:33:27,088 --> 00:33:31,634
and are about to change
this land forever.
449
00:33:31,675 --> 00:33:34,262
[growling]
450
00:33:40,434 --> 00:33:42,312
NARRATOR: Over the course
of hundreds
451
00:33:42,353 --> 00:33:44,439
of thousands of years,
452
00:33:44,480 --> 00:33:46,232
the movement of the continents
453
00:33:46,273 --> 00:33:50,361
continue to push North and
South America closer together.
454
00:33:52,446 --> 00:33:54,699
A new permanent land
bridge grows
455
00:33:54,740 --> 00:33:56,993
at what will
one day be Panama.
456
00:34:01,539 --> 00:34:04,084
Thousands of species
of plant and animal
457
00:34:04,125 --> 00:34:07,378
move both north and south.
458
00:34:08,671 --> 00:34:11,716
It is one of the largest
rapid mixings of plant
459
00:34:11,757 --> 00:34:14,635
and animal species
in Earth‘s history.
460
00:34:17,596 --> 00:34:20,808
And as these vastly
different species collide,
461
00:34:21,684 --> 00:34:25,772
they forge a new future
for the Americas.
462
00:34:37,324 --> 00:34:39,536
One million years later,
463
00:34:39,577 --> 00:34:43,873
life in South America has
gone through a seismic shift.
464
00:34:46,667 --> 00:34:49,379
During the great
Clash of Species,
465
00:34:49,420 --> 00:34:52,257
many went extinct.
466
00:34:52,298 --> 00:34:56,511
But out of the melting pot,
new ones have evolved.
467
00:35:03,100 --> 00:35:06,104
Now, at the top
of the food chain,
468
00:35:06,145 --> 00:35:10,399
sits the giant
South American sabretooth.
469
00:35:12,026 --> 00:35:14,487
Four times the weight
of the sabretooths
470
00:35:14,528 --> 00:35:16,405
that crossed
over from the North,
471
00:35:17,156 --> 00:35:21,661
this is one of the largest
cats that ever lived.
472
00:35:26,874 --> 00:35:29,585
The gomphotheres
are also thriving.
473
00:35:31,003 --> 00:35:35,091
Tens of thousands now
roam these grassy plains.
474
00:35:41,847 --> 00:35:45,602
And a large herd of
gomphotheres is perfect
475
00:35:45,643 --> 00:35:47,770
for a hungry sabretooth.
476
00:35:53,442 --> 00:35:56,362
[sabretooth growling]
477
00:35:56,403 --> 00:35:57,822
[Gomphothere trumpeting]
478
00:36:05,996 --> 00:36:08,249
Unlike his Northern cousins,
479
00:36:08,290 --> 00:36:10,710
this predator hunts alone
480
00:36:12,503 --> 00:36:16,841
and is easily large enough to
take down a gomphothere calf.
481
00:36:33,357 --> 00:36:37,445
[Gomphothere trumpeting]
482
00:36:52,293 --> 00:36:55,463
[frantic music]
483
00:36:56,797 --> 00:36:59,300
[Gomphothere trumpeting]
484
00:36:59,341 --> 00:37:01,469
[sabretooth growling]
485
00:37:02,386 --> 00:37:04,430
[gomphothere grunting]
486
00:37:05,848 --> 00:37:07,808
A bull gomphothere.
487
00:37:09,310 --> 00:37:11,437
[gomphothere growling]
488
00:37:11,478 --> 00:37:13,773
Pumped full of testosterone,
489
00:37:16,859 --> 00:37:19,487
the little guy
is part of a herd.
490
00:37:20,529 --> 00:37:22,907
[animals growling]
491
00:37:22,948 --> 00:37:27,787
And even apex predators
know when to run from a fight.
492
00:37:36,503 --> 00:37:38,965
[gomphothere trumpeting]
493
00:37:42,468 --> 00:37:46,764
[gomphothere trumpeting]
494
00:37:50,642 --> 00:37:53,021
From their origins in Africa,
495
00:37:53,062 --> 00:37:56,441
the elephant family have now
claimed a fifth continent
496
00:37:56,482 --> 00:37:57,817
as their home.
497
00:38:06,784 --> 00:38:10,288
A million years after
the Americas unite,
498
00:38:10,329 --> 00:38:13,958
there’s been
an explosion in biodiversity.
499
00:38:17,795 --> 00:38:19,213
The continent will go on
500
00:38:19,254 --> 00:38:22,300
to support 32 different
types of mammals
501
00:38:22,341 --> 00:38:24,760
that weigh over a ton.
502
00:38:28,889 --> 00:38:32,310
It‘s the greatest
diversity of mega-mammals
503
00:38:32,351 --> 00:38:34,937
in Earth‘s history.
504
00:38:54,123 --> 00:38:57,210
The impact of the joining
of the Americas
505
00:38:57,251 --> 00:38:59,211
can still be seen today.
506
00:39:07,678 --> 00:39:12,725
NARRATOR: But more recently, it
is humans that have kickstarted
507
00:39:12,766 --> 00:39:15,269
an even bigger clash of species.
508
00:39:16,395 --> 00:39:20,691
After some 110 million years
of separation,
509
00:39:20,732 --> 00:39:25,780
the arrival of Columbus marked
a new continental collision.
510
00:39:29,116 --> 00:39:32,119
Living things from
Africa and Eurasia
511
00:39:33,078 --> 00:39:35,706
met with those
of the Americas.
512
00:39:37,458 --> 00:39:41,379
Everything from
livestock and insects
513
00:39:41,420 --> 00:39:43,423
to vegetables and viruses
514
00:39:43,464 --> 00:39:47,134
moved both ways
across the Atlantic.
515
00:39:49,386 --> 00:39:52,640
The consequences of our
re-connecting the continents
516
00:39:52,681 --> 00:39:54,350
have been profound:
517
00:39:56,560 --> 00:39:59,688
Some species’
populations are exploding,
518
00:40:02,483 --> 00:40:05,069
while others’ go extinct.
519
00:40:08,906 --> 00:40:10,908
Humans have
impacted the environment
520
00:40:10,949 --> 00:40:12,493
in countless ways,
521
00:40:13,327 --> 00:40:16,622
but the way our activities
are now mixing species
522
00:40:16,663 --> 00:40:18,374
on a global scale
523
00:40:20,501 --> 00:40:23,754
is perhaps our biggest legacy
524
00:40:24,922 --> 00:40:30,052
to the future shape
of life on Earth.
36871
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