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[squeaking]
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[squeaking continues]
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[Uzo Aduba] There's something
magical about dolphins.
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They appear so friendly.
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Yet so otherworldly.
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[uplifting music plays]
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They're clearly intelligent.
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And agile.
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[uplifting music continues]
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But we've still barely glimpsed
beneath the surface.
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[uplifting music continues]
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Now we can immerse ourselves
in their world,
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we're discovering
just how sophisticated they are.
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[birds squawking]
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[uplifting music continues]
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And the deeper we look,
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the more like us they seem.
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[uplifting music swells]
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[music fades]
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[tranquil music plays]
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Born into a world
where he can't even breathe,
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a young Atlantic spotted dolphin
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has a lot to learn about surviving at sea.
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A good thing he has someone
to show him the way.
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[tranquil music continues]
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Mom.
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And a wider group of family and friends.
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[dolphins squeak]
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[tranquil music continues]
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They'll help teach him
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how to find food…
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and how to avoid danger.
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But dolphin society is complicated.
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The greatest challenge
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is learning how to fit in.
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[tranquil music continues]
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These warm, shallow waters
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are also home to another species.
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Bottlenose dolphins.
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This might seem the perfect place
for a mother to raise her newborn calf…
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but even here,
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life isn't easy.
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[tense music plays]
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They're being followed.
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[suspenseful music plays]
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A group of males,
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looking for a mate.
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[suspenseful music continues]
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They could attack the baby to get to Mom.
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[suspenseful music continues]
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[dolphins click]
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More dolphins join the chase.
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[tense music plays]
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Mom does all she can to protect her calf.
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[dramatic music plays]
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Eventually,
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she fights them off.
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[dolphins squeak]
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But her baby is nowhere to be seen.
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Alone, he stands little chance.
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[tranquil music plays]
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Reunited with Mom…
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and her allies,
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the calf a little wiser
in the ways of the world.
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But his lessons in becoming a dolphin
have only just begun.
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[uplifting music plays]
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Dolphins are air-breathing mammals,
like us.
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Their ancestors once lived on dry land,
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but 50 million years ago,
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they did something amazing.
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Left the land
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to enter a life aquatic.
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[uplifting music continues]
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While one branch of the family
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became huge, filter-feeding baleen whales…
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they turned into streamlined,
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quick-thinking predators.
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Today, over 40 species of dolphin
hunt the oceans of the world.
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[uplifting music continues]
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From tropical waters…
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to polar seas,
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and even in rivers
thousands of miles inland,
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wherever there is prey,
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there's a dolphin
with a clever way of catching it.
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[uplifting music crescendos]
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Orca are the largest members
of the family.
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They can grow nearly 30 feet long
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and weigh seven tons.
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Each needs to catch
over 100 lb. of food a day.
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[tranquil music plays]
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Not easy in the polar winter.
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Unless you know where to look.
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[tranquil music continues]
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During the coldest months,
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their favorite prey
shelters in protected fjords.
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[tranquil music continues]
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Herring.
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In their billions.
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[tranquil music swells]
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[tense music plays]
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Tracking down their exact location
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can be tricky.
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Catching them is even harder.
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[tense music continues]
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[squeaking]
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Led by an experienced female,
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the family pod home in on the vast shoal.
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As long as the herring keep formation,
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they're hard to single out.
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[tense music plays]
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But the orca have a plan.
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[tense music continues]
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[dolphins squeak]
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With pulsing calls,
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and by flashing their white bellies…
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they herd the herring into the shallows.
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[tense music continues]
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In the panic, the fish form
tighter and tighter shoals.
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[tense music continues]
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Until finally,
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the orca can strike.
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[tense music continues]
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[thudding]
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[thudding]
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00:10:19,828 --> 00:10:24,166
Smashing their tail flukes
creates powerful pressure waves.
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-[thudding]
-[dolphins squeak]
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A barrage of knockout blows.
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[somber music plays]
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[thudding]
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[dolphin squeaks]
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Once the fish are stunned,
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the orca can eat at leisure.
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[dolphins squeal]
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[tranquil music plays]
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00:11:09,086 --> 00:11:13,340
Dolphins maximize their hunting success
by working as a team.
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00:11:15,259 --> 00:11:17,177
And out in the open ocean,
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they operate on an epic scale.
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[dramatic music plays]
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A stampede of spinner dolphins.
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A super pod over a thousand strong.
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[dramatic music continues]
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They make such an effective hunting force,
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they can afford plenty of downtime.
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{\an8}Two hundred miles east of Brazil,
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this archipelago is a favorite stop-off
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for Atlantic spinner dolphins.
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They head for the island's shallow bays.
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The first arrivals are in high spirits.
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[uplifting music plays]
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The Olympic gymnasts
of the dolphin family.
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They can leap ten feet
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and spin seven times.
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[uplifting music continues]
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It looks a lot of fun.
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00:13:15,087 --> 00:13:18,257
But it's thought
there's more to these acrobatics.
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[uplifting music crescendos]
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Perhaps they're communicating,
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greeting other dolphins entering the bay.
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[dolphins squeak]
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[tranquil music plays]
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With safety in numbers,
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the spinners can relax.
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[tranquil music continues]
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But they can't switch off completely,
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or they would drown.
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00:14:08,432 --> 00:14:11,810
So they shut down
one side of their brain at a time…
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with one eye on where they're going.
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Sleep swimming at half speed.
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00:14:20,944 --> 00:14:22,946
[tranquil music continues]
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While older dolphins rest,
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the younger ones play.
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[tranquil music plays]
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[jaunty music plays]
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A game of seaweed catch.
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[jaunty music continues]
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It seems simple enough.
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[jaunty music continues]
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But this is
surprisingly sophisticated play.
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Manipulating objects,
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copying moves and, most importantly,
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understanding each other.
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A skill every young dolphin
must master as it grows.
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By a year old,
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an Atlantic spotted calf
is almost fluent in dolphin.
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00:16:10,012 --> 00:16:12,014
[tranquil music plays]
186
00:16:14,391 --> 00:16:16,435
[dolphins click and squeak]
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00:16:16,518 --> 00:16:18,854
[tranquil music continues]
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00:16:22,232 --> 00:16:25,652
Much can be communicated
through body language and touch.
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00:16:27,738 --> 00:16:29,823
A flipper rub reassures,
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00:16:30,824 --> 00:16:32,325
like holding hands.
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00:16:33,368 --> 00:16:35,328
[dolphin clicks]
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00:16:35,412 --> 00:16:39,416
But some things
can only be said with sound.
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[dolphin squeaks]
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00:16:43,003 --> 00:16:45,005
His mom repeats a unique call.
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00:16:45,088 --> 00:16:46,006
[dolphin squeaks]
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Her signature whistle.
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00:16:51,803 --> 00:16:52,679
[dolphin squeaks]
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00:16:53,472 --> 00:16:55,807
It helps him to find her in a crowd.
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[dolphin squeaks]
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00:17:00,645 --> 00:17:02,939
And once he's learned to copy it,
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he can call her by her name.
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[dolphin squeaks]
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00:17:08,070 --> 00:17:11,615
Now it's time to experiment
with a whistle of his own.
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[high-pitched squeak]
205
00:17:13,408 --> 00:17:14,493
[high-pitched squeak]
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00:17:16,495 --> 00:17:17,788
Like children,
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dolphins take years learning to speak.
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And once they start talking…
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[squeaking]
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…they never let up.
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[dolphin clicks]
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00:17:38,266 --> 00:17:42,229
But a dolphin's sonic skills
go way beyond words.
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00:17:42,771 --> 00:17:44,773
[tense music plays]
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00:17:48,151 --> 00:17:51,947
The local bottlenose
are searching for food on the sea floor.
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00:17:52,489 --> 00:17:54,032
[squeaking]
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00:17:54,116 --> 00:17:56,076
There doesn't appear to be much here.
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00:17:57,869 --> 00:18:02,040
But they can see things we can't.
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00:18:02,124 --> 00:18:04,209
[tense music continues]
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00:18:09,381 --> 00:18:12,467
They fire a stream of high-pitched clicks.
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00:18:13,677 --> 00:18:16,638
Five hundred per second.
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00:18:16,721 --> 00:18:23,562
[dolphins clicking]
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00:18:24,688 --> 00:18:26,690
And interpret the echoes
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00:18:26,773 --> 00:18:29,609
to pinpoint fish hiding in the sand.
224
00:18:31,528 --> 00:18:38,410
[dolphin clicks]
225
00:18:43,707 --> 00:18:50,672
[dolphin clicks]
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00:18:52,424 --> 00:18:55,844
Echolocation is
an extraordinary sixth sense…
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00:18:57,888 --> 00:19:03,185
that allows dolphins to hunt
in the most unlikely of places.
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00:19:15,155 --> 00:19:16,448
A muddy estuary,
229
00:19:17,490 --> 00:19:20,076
and the tide is dropping.
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00:19:21,745 --> 00:19:25,999
Right now, heading inland
could be a risky move.
231
00:19:27,042 --> 00:19:29,044
[tranquil music plays]
232
00:19:38,720 --> 00:19:43,308
But this dolphin knows
the estuary is full of fish.
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00:19:43,391 --> 00:19:45,393
[tranquil music continues]
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00:19:53,944 --> 00:19:55,946
Using echolocation,
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00:19:56,029 --> 00:20:00,659
she can navigate the silty waters
and find her prey.
236
00:20:00,742 --> 00:20:05,413
[dolphin clicks]
237
00:20:05,497 --> 00:20:07,499
[tranquil music continues]
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00:20:08,708 --> 00:20:10,293
Only problem is,
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00:20:10,377 --> 00:20:13,338
at low tide they hide in the oyster beds.
240
00:20:15,257 --> 00:20:18,343
Charging in would shred
her sensitive skin.
241
00:20:20,804 --> 00:20:25,141
Somehow, she needs
to get the fish into the open.
242
00:20:30,188 --> 00:20:32,190
[tense music plays]
243
00:20:38,863 --> 00:20:42,784
Pumping her tail,
she flushes them out of hiding
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00:20:43,868 --> 00:20:47,289
and towards the sandy banks,
where it's safe to strike.
245
00:20:47,372 --> 00:20:49,374
[tense music continues]
246
00:20:52,002 --> 00:20:54,045
[tense music crescendos]
247
00:20:55,755 --> 00:20:58,883
Only a few dolphins
have learned to hunt like this.
248
00:21:03,722 --> 00:21:05,807
And the technique only works
249
00:21:05,890 --> 00:21:08,101
for a few hours each day.
250
00:21:14,774 --> 00:21:17,360
When the tide begins to rise,
251
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the fish disperse.
252
00:21:19,446 --> 00:21:21,448
[hopeful music plays]
253
00:21:22,741 --> 00:21:24,659
A new strategy is needed.
254
00:21:28,705 --> 00:21:30,707
She joins forces with friends
255
00:21:32,042 --> 00:21:35,503
and together they head
towards wider channels.
256
00:21:35,587 --> 00:21:37,589
[hopeful music continues]
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00:21:39,549 --> 00:21:40,550
Then,
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they wait.
259
00:21:53,146 --> 00:21:54,898
[dramatic music plays]
260
00:21:58,735 --> 00:22:00,987
[birds squawk]
261
00:22:01,071 --> 00:22:03,073
[dramatic music continues]
262
00:22:11,039 --> 00:22:13,083
[dolphins squeak]
263
00:22:13,166 --> 00:22:14,709
[dramatic music continues]
264
00:22:18,797 --> 00:22:20,799
[dramatic music fades]
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00:22:28,056 --> 00:22:30,266
Each time a shoal swims past,
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00:22:30,350 --> 00:22:32,227
the dolphins attack,
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00:22:33,895 --> 00:22:37,023
creating bow waves
that wash the fish ashore.
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00:22:37,607 --> 00:22:39,776
[dramatic music plays]
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00:22:54,624 --> 00:22:58,378
Through echolocation and coordination,
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00:22:58,461 --> 00:23:01,548
they conjure a feast from the mud.
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00:23:04,509 --> 00:23:06,511
[dramatic music fades]
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00:23:08,304 --> 00:23:10,306
Out in the big blue,
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00:23:10,390 --> 00:23:13,810
dolphins must push
their super senses to the limits.
274
00:23:18,690 --> 00:23:21,067
[tranquil music plays]
275
00:23:21,151 --> 00:23:23,027
The challenge of hunting in the abyss
276
00:23:23,111 --> 00:23:27,824
has created one of the most
extraordinary dolphins of all.
277
00:23:27,907 --> 00:23:29,909
[tranquil music continues]
278
00:23:33,997 --> 00:23:38,001
[dolphin squeaks]
279
00:23:38,084 --> 00:23:40,462
[tranquil music continues]
280
00:23:48,511 --> 00:23:51,097
Pilot whales may look strange,
281
00:23:51,806 --> 00:23:55,935
but their bulbous foreheads
hold the secret to their success.
282
00:23:57,187 --> 00:24:01,274
They project long-range sonic beams
hundreds of feet.
283
00:24:02,317 --> 00:24:05,820
The most powerful echolocation
of any dolphin.
284
00:24:07,071 --> 00:24:09,073
[tranquil music continues]
285
00:24:10,283 --> 00:24:13,036
{\an8}[dolphins click]
286
00:24:13,745 --> 00:24:16,873
{\an8}It enables pilot whales
to hunt shoals of squid
287
00:24:16,956 --> 00:24:19,083
over half a mile down.
288
00:24:19,918 --> 00:24:24,589
[dolphins click and squeak]
289
00:24:24,672 --> 00:24:26,674
[tranquil music continues]
290
00:24:29,469 --> 00:24:33,181
But young calves can't hold their breath
long enough to follow.
291
00:24:37,560 --> 00:24:40,688
So the family take turns
292
00:24:40,772 --> 00:24:42,732
babysitting at the surface.
293
00:24:44,108 --> 00:24:45,902
[tranquil music continues]
294
00:24:45,985 --> 00:24:48,696
Grandma is over 50 years old.
295
00:24:50,031 --> 00:24:53,368
But she still produces milk
to keep the youngsters fed.
296
00:25:02,460 --> 00:25:05,922
These dolphins live up to 70 years
297
00:25:06,923 --> 00:25:09,217
and stay with the family for life.
298
00:25:10,093 --> 00:25:15,014
Possibly the longest,
most loyal bonds of any animal.
299
00:25:15,682 --> 00:25:21,229
[dolphins squeak]
300
00:25:22,480 --> 00:25:24,649
When the hunting party surfaces,
301
00:25:24,732 --> 00:25:26,734
it's clear they've had success.
302
00:25:32,824 --> 00:25:34,409
Time to move on.
303
00:25:35,785 --> 00:25:38,913
Grandma has a mental map
of their ocean home.
304
00:25:40,039 --> 00:25:43,835
She listens for the sounds
of waves crashing on islands
305
00:25:43,918 --> 00:25:46,588
and currents washing around sea mouths.
306
00:25:49,591 --> 00:25:52,385
Acoustic landmarks revealing the route.
307
00:25:53,595 --> 00:25:55,597
[tranquil music plays]
308
00:25:59,392 --> 00:26:00,602
But sometimes,
309
00:26:01,853 --> 00:26:04,355
even these great navigators
lose their way.
310
00:26:08,318 --> 00:26:09,736
[somber music plays]
311
00:26:09,819 --> 00:26:10,695
Every year,
312
00:26:11,696 --> 00:26:15,325
hundreds of dolphins
strand on beaches around the world.
313
00:26:16,284 --> 00:26:18,828
Pilot whales more often than most.
314
00:26:20,997 --> 00:26:23,958
It only takes one or two to go off course…
315
00:26:26,044 --> 00:26:29,589
and family members
feel compelled to swim to their side.
316
00:26:30,882 --> 00:26:33,092
[somber music continues]
317
00:26:33,176 --> 00:26:36,304
Sometimes, their distress calls
bring hundreds more.
318
00:26:36,387 --> 00:26:39,766
[dolphins squeak]
319
00:26:44,479 --> 00:26:46,397
Natural disasters,
320
00:26:46,481 --> 00:26:48,858
noise pollution, and ill health
321
00:26:48,941 --> 00:26:51,110
all seem to play a part.
322
00:26:53,613 --> 00:26:57,241
{\an8}But the exact triggers for these events
are poorly understood.
323
00:26:57,325 --> 00:26:59,327
{\an8}[somber music continues]
324
00:27:04,666 --> 00:27:08,169
{\an8}People do all they can
to keep stranded whales alive
325
00:27:08,252 --> 00:27:10,963
and try to help them back out to sea.
326
00:27:11,047 --> 00:27:12,924
[somber music continues]
327
00:27:20,473 --> 00:27:24,018
The connection between humans
and dolphins runs deep.
328
00:27:25,728 --> 00:27:30,149
We share a thrill-seeking side
found in few other animals.
329
00:27:31,275 --> 00:27:36,280
And we express ourselves in ways
that have no obvious role in survival.
330
00:27:36,364 --> 00:27:38,366
[dramatic music plays]
331
00:27:41,077 --> 00:27:43,871
But it seems
there's purpose to all this play.
332
00:27:46,332 --> 00:27:48,710
It produces a rush of hormones
333
00:27:48,793 --> 00:27:51,963
that create feelings
of confidence and joy.
334
00:27:53,673 --> 00:27:56,926
Playing together heightens these emotions…
335
00:27:59,095 --> 00:28:03,057
encouraging teamwork
and time spent with friends.
336
00:28:03,141 --> 00:28:05,977
[exhilarating music plays]
337
00:28:17,113 --> 00:28:20,408
Perhaps this is why dolphins
seek the company of others.
338
00:28:20,491 --> 00:28:22,910
[exhilarating music continues]
339
00:28:34,797 --> 00:28:36,924
Playing with their own kind.
340
00:28:37,008 --> 00:28:40,052
[exhilarating music continues]
341
00:28:41,763 --> 00:28:42,597
With us.
342
00:28:46,601 --> 00:28:48,603
And with other animals.
343
00:28:49,312 --> 00:28:51,314
[exhilarating music continues]
344
00:29:08,623 --> 00:29:10,041
[exhilarating music fades]
345
00:29:15,379 --> 00:29:18,299
Dolphins are famous
for their friendly nature.
346
00:29:20,468 --> 00:29:22,887
But they also have a darker side.
347
00:29:36,651 --> 00:29:39,987
When the ocean's top predators go hunting,
348
00:29:40,071 --> 00:29:42,114
nothing is safe.
349
00:29:42,949 --> 00:29:44,867
[dolphins squeaking]
350
00:29:54,001 --> 00:29:56,003
[ominous music plays]
351
00:30:01,634 --> 00:30:04,220
Southern right whales.
352
00:30:06,347 --> 00:30:08,599
Up to 80 tons.
353
00:30:08,683 --> 00:30:10,017
[whale trumpets]
354
00:30:10,101 --> 00:30:12,895
Ten times heavier than an orca.
355
00:30:17,608 --> 00:30:18,776
[whale trumpets]
356
00:30:21,362 --> 00:30:23,155
But working as a team,
357
00:30:24,115 --> 00:30:26,784
orca are almost unstoppable.
358
00:30:32,081 --> 00:30:34,500
The right whales make for the shallows
359
00:30:34,584 --> 00:30:36,586
to avoid attack from below.
360
00:30:36,669 --> 00:30:38,671
[tense music plays]
361
00:30:40,923 --> 00:30:43,801
But orca don't give up easily.
362
00:30:43,885 --> 00:30:46,012
[tense music continues]
363
00:30:48,055 --> 00:30:49,891
Taking turns,
364
00:30:49,974 --> 00:30:52,894
they smash into the whales' flanks,
365
00:30:52,977 --> 00:30:54,687
hitting them where it hurts.
366
00:30:55,938 --> 00:30:57,440
[tense music continues]
367
00:31:05,072 --> 00:31:07,116
The whales strike back.
368
00:31:07,199 --> 00:31:08,409
[squeaking]
369
00:31:08,492 --> 00:31:10,828
[tense music continues]
370
00:31:10,912 --> 00:31:12,121
[whale trumpets]
371
00:31:16,709 --> 00:31:18,085
[tense music crescendos]
372
00:31:18,169 --> 00:31:19,587
[squeaking]
373
00:31:20,504 --> 00:31:21,589
[whale trumpets]
374
00:31:21,672 --> 00:31:23,591
[tense music resumes]
375
00:31:35,061 --> 00:31:39,190
But it's only when the sounds of struggle
attract more right whales
376
00:31:40,733 --> 00:31:43,736
that the orca finally back off.
377
00:31:46,072 --> 00:31:48,074
[tense music fades]
378
00:31:50,576 --> 00:31:53,329
Orca's ability to take on such large prey
379
00:31:53,412 --> 00:31:55,957
earned them the nickname "whale killers,"
380
00:31:56,624 --> 00:31:57,458
or
381
00:31:58,209 --> 00:31:59,418
"killer whales."
382
00:32:02,922 --> 00:32:05,341
Dolphins are not just ruthless hunters.
383
00:32:06,634 --> 00:32:10,221
They can also be
surprisingly aggressive to each other.
384
00:32:21,857 --> 00:32:24,318
[tranquil music plays]
385
00:32:24,402 --> 00:32:25,653
By six years old,
386
00:32:26,237 --> 00:32:28,197
this young spotted dolphin
387
00:32:28,280 --> 00:32:31,409
has finally developed his trademark spots.
388
00:32:31,492 --> 00:32:33,494
[tranquil music continues]
389
00:32:37,373 --> 00:32:39,041
He's seeing less of Mom…
390
00:32:41,085 --> 00:32:44,296
and spending more time
hanging out with friends.
391
00:32:48,884 --> 00:32:52,555
Building alliances is crucial
in these early years.
392
00:32:52,638 --> 00:32:53,681
[dolphin clicks]
393
00:32:54,932 --> 00:32:56,934
[tranquil music continues]
394
00:33:02,773 --> 00:33:06,610
Dolphins form more numerous,
more intense relationships
395
00:33:06,694 --> 00:33:09,864
than any other animal except us.
396
00:33:09,947 --> 00:33:11,949
[tranquil music continues]
397
00:33:14,994 --> 00:33:18,205
As he matures,
life will become more complicated.
398
00:33:18,289 --> 00:33:22,043
[dolphins click and squeak]
399
00:33:22,126 --> 00:33:24,628
And he'll need all the friends he can get.
400
00:33:28,215 --> 00:33:30,217
[tranquil music fades]
401
00:33:36,766 --> 00:33:40,352
A community of bottlenose dolphins
in Western Australia
402
00:33:40,436 --> 00:33:45,357
is considered the most sophisticated
dolphin society of all.
403
00:33:48,319 --> 00:33:50,988
Two thousand live in this one bay.
404
00:33:51,697 --> 00:33:53,699
[upbeat music plays]
405
00:34:02,124 --> 00:34:04,251
During the breeding season,
406
00:34:04,335 --> 00:34:07,713
who you know
becomes more important than ever.
407
00:34:09,757 --> 00:34:11,675
Males that are able to team up
408
00:34:11,759 --> 00:34:14,011
have more chance of winning a mate.
409
00:34:14,095 --> 00:34:16,013
[upbeat music continues]
410
00:34:28,359 --> 00:34:31,237
This trio hangs out
on the east side of the bay.
411
00:34:31,320 --> 00:34:34,198
[upbeat music continues]
412
00:34:37,535 --> 00:34:41,539
They've been best friends for 20 years.
413
00:34:42,748 --> 00:34:44,750
[upbeat music fades]
414
00:34:44,834 --> 00:34:49,296
Swimming in sync
shows just how tight they are.
415
00:34:51,757 --> 00:34:55,845
And choreographed moves
help impress the opposite sex.
416
00:34:56,512 --> 00:34:58,514
[jaunty music plays]
417
00:35:02,935 --> 00:35:04,645
There's the crossover.
418
00:35:07,273 --> 00:35:08,482
The butterfly.
419
00:35:12,111 --> 00:35:13,946
The duo tail touch.
420
00:35:16,157 --> 00:35:17,992
Synchronous dives.
421
00:35:20,161 --> 00:35:21,537
Dual leaps.
422
00:35:22,997 --> 00:35:24,582
Tango moves.
423
00:35:25,249 --> 00:35:29,044
And the inverse rooster strut.
424
00:35:32,256 --> 00:35:36,010
The slicker the routine,
the more attractive they seem.
425
00:35:36,093 --> 00:35:38,095
[jaunty music continues]
426
00:35:41,557 --> 00:35:42,808
Even so,
427
00:35:42,892 --> 00:35:45,561
it often takes days to win over a female.
428
00:35:51,692 --> 00:35:54,403
And now they have competition.
429
00:35:56,530 --> 00:35:57,907
On the west side,
430
00:35:57,990 --> 00:36:00,117
rival gangs are forming.
431
00:36:00,201 --> 00:36:02,494
[tense music plays]
432
00:36:03,412 --> 00:36:05,706
The east side trio needs backup.
433
00:36:09,001 --> 00:36:11,795
So they call on a wider circle of friends.
434
00:36:11,879 --> 00:36:14,215
[tense music continues]
435
00:36:31,440 --> 00:36:33,234
Weaker gangs usually back down.
436
00:36:35,611 --> 00:36:37,988
But when the sides are equally matched,
437
00:36:39,365 --> 00:36:41,825
fights can cause serious injury.
438
00:36:45,996 --> 00:36:47,998
[tense music plays]
439
00:36:51,377 --> 00:36:53,379
[tense music intensifies]
440
00:37:27,871 --> 00:37:29,999
[tense music fades]
441
00:37:30,082 --> 00:37:31,083
An hour later,
442
00:37:32,167 --> 00:37:33,377
it's all over.
443
00:37:38,299 --> 00:37:41,593
Through strong allegiances
and tight teamwork,
444
00:37:41,677 --> 00:37:44,221
the east side friends emerge victorious
445
00:37:44,847 --> 00:37:48,642
{\an8}and win the chance
to father the next generation.
446
00:37:48,726 --> 00:37:50,728
{\an8}[tranquil music plays]
447
00:37:52,813 --> 00:37:54,940
Intelligence and collaboration
448
00:37:55,024 --> 00:37:58,986
have enabled dolphins
to navigate life in the ocean.
449
00:38:01,405 --> 00:38:03,824
But their home is changing fast.
450
00:38:06,869 --> 00:38:08,537
[dolphins click]
451
00:38:08,620 --> 00:38:12,291
Even these adaptable animals
are struggling to cope.
452
00:38:15,044 --> 00:38:16,211
[boat horn blares]
453
00:38:18,630 --> 00:38:20,716
Our seas are becoming noisier.
454
00:38:20,799 --> 00:38:22,051
[boat horn blares]
455
00:38:22,843 --> 00:38:23,719
Warmer.
456
00:38:25,471 --> 00:38:26,847
And more polluted.
457
00:38:34,313 --> 00:38:35,939
Instead of seaweed,
458
00:38:36,023 --> 00:38:39,151
many dolphins now play with plastic bags.
459
00:38:49,661 --> 00:38:55,334
Swallowing trash kills over
100,000 marine mammals every year.
460
00:38:56,377 --> 00:38:58,629
And chemical contamination
461
00:38:58,712 --> 00:39:01,382
threatens their ability to reproduce.
462
00:39:04,718 --> 00:39:09,348
But industrial-scale fishing
is the biggest problem dolphins face…
463
00:39:12,017 --> 00:39:14,436
rapidly depleting their vital food
464
00:39:15,062 --> 00:39:19,233
and drowning hundreds
of thousands of them each year.
465
00:39:19,316 --> 00:39:21,318
[somber music plays]
466
00:39:28,283 --> 00:39:31,412
However, even small changes in our actions
467
00:39:31,495 --> 00:39:33,747
can make a big difference.
468
00:39:35,207 --> 00:39:37,209
[upbeat music plays]
469
00:39:47,428 --> 00:39:49,346
When fishermen trawl for shrimp…
470
00:39:52,099 --> 00:39:54,601
other animals are caught in their nets.
471
00:39:57,104 --> 00:40:00,607
But these fishermen
now incorporate special openings
472
00:40:00,691 --> 00:40:02,901
so larger animals can escape.
473
00:40:06,196 --> 00:40:09,408
And the local bottlenose
have learned to seek them out,
474
00:40:10,868 --> 00:40:14,788
{\an8}using the exit holes
to pick out a prize of fish.
475
00:40:15,289 --> 00:40:18,083
[upbeat music continues]
476
00:40:31,472 --> 00:40:34,641
Entering these death traps
is a risky maneuver.
477
00:40:38,812 --> 00:40:41,732
But these hungry dolphins
take their chances.
478
00:40:43,442 --> 00:40:46,487
[upbeat music continues]
479
00:40:56,538 --> 00:40:58,332
And the fishermen tolerate them.
480
00:41:01,251 --> 00:41:03,086
There's no loss to their catch.
481
00:41:06,423 --> 00:41:08,425
[upbeat music fades]
482
00:41:08,509 --> 00:41:11,261
We still have a lot to learn
about dolphins.
483
00:41:12,054 --> 00:41:15,432
And while some species
are on the brink of extinction,
484
00:41:17,100 --> 00:41:20,354
new ones are still being found.
485
00:41:20,437 --> 00:41:22,439
[jaunty music plays]
486
00:41:26,693 --> 00:41:31,949
It's long been thought there were five
species of river dolphin in the world.
487
00:41:32,032 --> 00:41:35,285
Now biologists believe
they've discovered a sixth.
488
00:41:37,371 --> 00:41:42,543
Only around 1,000 Araguaian river dolphins
are thought to exist.
489
00:41:42,626 --> 00:41:45,337
[jaunty music continues]
490
00:41:46,296 --> 00:41:48,048
But every day
491
00:41:48,131 --> 00:41:50,384
in this Brazilian town,
492
00:41:50,467 --> 00:41:52,803
a small number come to hang out.
493
00:41:54,930 --> 00:41:58,475
The local children can hardly wait.
494
00:42:03,730 --> 00:42:08,151
{\an8}It's easy to understand
their affinity with these magical animals.
495
00:42:12,739 --> 00:42:17,035
{\an8}Humans and dolphins
may inhabit very different worlds…
496
00:42:19,538 --> 00:42:23,041
but there's much in our nature
that we share.
497
00:42:24,042 --> 00:42:26,044
[uplifting music plays]
498
00:42:30,132 --> 00:42:32,843
A deep connection to be cherished
499
00:42:33,719 --> 00:42:36,513
for generations to come.
500
00:42:36,597 --> 00:42:39,766
[uplifting music continues]
501
00:42:44,980 --> 00:42:46,982
[uplifting music fades]
502
00:42:48,233 --> 00:42:50,027
[dramatic music plays]