Original subtitles

This is The Americas,

an extraordinary journey across Earth's great supercontinent.

The widest variety of life on the planet.

The untold story

of our home.

Tonight on The Americas...

The Gulf Coast.

A dazzling water world

with hidden depths

set on America's most dynamic coastline.

To master a world caught between water

and land

takes determination

and courage.

From America's widest river

to unfathomable swamps.

Here,

survival is truly...

sink...

or swim.

The Gulf Coast is where the American South meets the sea.

It's defined by water.

Florida is home to the greatest subtropical wetland in the U.S.

And the 1,200-mile coastline runs all the way to Texas.

At its heart is the largest swamp in America,

the Atchafalaya.

More than a million acres of Southern Louisiana.

It's spectacular.

The labyrinth of countless slews and bayous

where magical stories unfold.

This old split oak tree

hides one of the swamp's most surprising inhabitants.

A Louisiana black bear.

Scientists have been tracking her

and know she spent winter in this den.

Now, the seasonal flood means she's surrounded by water

up to five feet deep.

She hasn't eaten for more than three months.

With all this water, finding food will mean getting wet.

But that's...

...the least of her worries.

Three-month-old twins, still pretty unsteady on their feet.

She wants them to stay put...

...while she goes to find food.

And Mother knows best.

The closest dry land where she can find enough food

may be over a mile away

through this flooded maze.

Over the winter, she's lost a third of her body weight

producing fat-rich milk to feed her cubs.

And they're still hungry.

She will have to eat fast and hurry home.

Born in the sanctuary of the tree house,

the little cubs have only ever glimpsed the outside world.

Playing out on the porch by themselves is...

risky.

They've never seen water before.

Mom's out there, somewhere.

Unfortunately, some bear cubs just don't understand the dangers

of exploring on their own.

That water is cold.

A cub this young does not have the strength to keep swimming

for more than a few minutes.

Cubs do drown in these swamps.

It's Mom.

Black bears don't always get it right.

There's no sign of life.

Or is there?

He's cold and shaken,

but very much alive.

Mom's got his back.

To pass Swamp Survival 101...

listen to your mother.

One animal not only survives here, but rules these waterways.

It has a fearsome reputation,

but that's only part of its story.

The waterways of the Gulf Coast are mysterious places

where you can get truly lost.

But you'll certainly never be alone.

Because here in the South,

where there is fresh water,

there are gators.

Hunted almost to extinction, American alligators are now protected

and have bounced back...

big time.

Today, there are more than four million,

and Southerners have learned to share the gators' world.

Alligators have barely changed for millennia,

so we might have thought we knew all there is to know about them.

But here in Southern Georgia's Okefenokee Swamp,

scientists have spotted some surprising new behavior.

These hatchlings are just a few weeks old.

Eight inches...

to Mom's eight feet.

At this size, they're more prey than predator.

A Great Blue Heron can swallow a baby gator whole.

But not when Mom's around.

She's more than just a bodyguard.

She's giving them a head start.

The best way to stay safe from predators

is to grow too big to be eaten.

To do that, hatchlings need to become expert hunters.

And it seems Mom knows just how to help.

Stirring up the water,

she brings bugs and beetles to the surface.

So they're easier to catch.

This is known as "facilitated foraging"

and was first described by scientists in 2022.

It's like having their own private diner.

Where they can hone their ambush skills.

Or at least...

try to.

Alligator ancestors rubbed shoulders with dinosaurs.

Who knows what other secrets

they're keeping in the swamps...

of the Gulf Coast?

All these wetlands depend on one thing.

Rain.

The Gulf Coast is home

to four of the five rainiest states in the U.S.

Louisiana,

Mississippi,

Alabama,

and perhaps surprisingly, Florida,

a state where an average of 150 billion gallons of rain

falls every day.

Almost a third of that seeps into the ground.

Beginning a journey that's been made for millions of years.

Rainwater is naturally acidic.

And drop by drop, century by century,

it eats through limestone bedrock.

Tiny cracks eventually widen...

into caves.

This is the Floridan aquifer.

One of the least explored places in America.

Divers risk their lives to uncover its secrets.

It's like a giant Swiss cheese,

the flooded passageways

stretching for 100,000 square miles.

It channels fresh water underneath the whole of Florida

and as far as Mississippi and South Carolina.

Yet on the surface...

you'd never know it was there.

Almost all the water that people use in the Sunshine State

comes from this precious reservoir,

right beneath their feet.

Some caves may be a thousand feet deep.

Without our lights, there's absolute darkness.

But life finds a way.

The Georgia blind salamander.

The size of your pinky.

In a world that never sees sun,

skin needs no protective pigment.

But there's no point in having eyes.

Instead,

sensory pits on its snout detect the slightest movement.

The worm will be safe

only if

it stays still.

Ah, well.

What a life.

Where the aquifer caves are close to the surface...

water flows out.

Into more than a thousand crystal clear springs...

at a temperature close to 72 degrees

all year round.

During the winter months,

these places are vital for the survival

of one of Florida's strangest but most loved animals.

Florida is home

to the greatest concentration of springs on Earth.

These and Crystal River

are winter refuges for animals who share an ancestor

with elephants.

Manatees.

They're huge.

They can be the size of your couch,

but they barely have an ounce of insulating fat.

So the warmth of Florida springs is a lifeline.

Seasonal get-togethers are a welcomed chance to socialize.

A game of touch tag

is simply too good to miss.

Scientists called this behavior "cavorting."

Rarely filmed, these males are in fact

honing their social skills

and practicing courtship moves.

There's still a lot to understand about manatee friendships.

But perhaps these are bonds that will last a lifetime.

Manatees can live more than half a century

and return to the same springs year after year.

Safe harbors, crucial for their survival.

As water flows southwards in Florida,

the line between land and water continues to blur,

creating in these flat lowlands

one of America's great natural wonders.

The Everglades.

A shallow sheet of water that is, in fact,

a slow-moving river,

the widest in America.

There's little to break the horizon but sawgrass,

which gives it the rather more romantic name,

the "River of Grass."

Home to over a thousand types of animals.

In places, water creeps along at just two feet an hour.

You could say...

life moves at a snail's pace.

But this is no ordinary snail.

The Florida apple snail

is the largest native freshwater snail in America.

The size of a golf ball.

She's expecting a brood of babies,

but there's one obstacle.

Apple snails must lay their eggs out of water,

so they'll be out of reach of hungry fish.

And that means going up.

But climbing to the surface

puts her life at risk.

Patrolling the skies

is an apple snail's nemesis.

Many have already fallen victim.

This carnage is the signature

of a remarkable and deadly bird of prey.

The skies above Florida's Everglades are patrolled by a predator

with a lethal speciality.

An Everglade snail kite.

These endangered birds rely on one thing as prey.

Apple snails.

Each bird can eat more than a dozen snails a day.

The curve of the kite's bill

perfectly matches the spiral of the shell.

A tool evolved for shucking snails.

And that's bad news if you're an apple snail

that needs to lay eggs.

A kite can spot a snail just under the water's surface

from 30 feet up.

Apple snails do have an escape plan.

Back to square one.

But kites don't hunt after dark.

So nightfall gives an opportunity.

She's climbing a blade of sawgrass.

The tiny barbs will help protect her brood.

She's in position.

It's now or never.

Before sunrise, she must lay dozens of eggs.

Time-lapse photography

reveals this wonder of nature.

Dawn.

And just a few more to go.

The last one.

Mission accomplished.

In a couple of weeks, the eggs are ready to hatch.

Independent from the get-go,

a new generation of apple snails

will grow up in the mighty Everglades,

until it is their turn...

to face the kites.

The vast river of grass eventually makes its way

towards Florida's Gulf Coast.

Where seawater mixes with the river's freshwater,

mangrove trees thrive.

Forming the biggest mangrove forest in North America,

larger than New York City.

It straddles land and water,

a network of exquisite tiny islands.

Most are uninhabited,

but not all.

When there's an opportunity to live in paradise,

who wouldn't jump at the chance?

In just 60 years,

Marco Island has gone from near wilderness

to a city of almost 20,000.

Here, yards are irrigated all year round.

So grass is green and luscious.

And everyone has the perfect lawn,

or, almost perfect.

Holes are appearing everywhere,

a sign that someone surprising has moved into the neighborhood.

On Florida's Gulf Coast,

the immaculate lawns of Marco Island have been invaded

by something...

people have fallen in love with.

Burrowing owls.

This little guy

lives right in the middle of suburbia.

Only the size of a soda bottle,

he needs short grass so he has a clear view of his surroundings.

These little owls originally lived on prairies

where bison kept the grass close-cropped.

Here, we do that job.

Making it the ideal place...

to build a home.

He's putting the finishing touches on an eight-foot burrow.

But this is the easy bit.

Finding a mate to share it with him

is going to be tricky.

He seems to be late to the party.

There are 250 pairs here,

so there are couples everywhere.

Some even have chicks.

He needs to find a date.

Hooting...

and bobbing...

...mark his territory.

And signal

his relationship status.

"Single owl, not too tall,

"would like to meet female for eggs, chicks,

and a lifetime of happiness."

But the course of true love never did run smooth.

Day and night,

he puts himself out there...

...sleepless in suburbia.

But try as he might,

he's not got a hoot in return.

His chances of raising a family this year

are not looking good.

He's just too late.

Or is he?

This is the moment he's been hoping for.

She's definitely looking at him.

Don't blow it, now.

Well, that seems promising.

Time to introduce himself properly.

The next three months will be all about getting to know one another

as they raise their brood.

With luck, the first of many they'll have in this neighborhood.

But as anyone living along this coastline knows,

paradise comes at a cost.

Ten hurricanes have hit the Gulf Coast

in just five years,

and they're becoming increasingly ferocious.

Protecting the mainland from storm surges

are dozens of barrier islands,

natural offshore shock absorbers.

But as the climate heats,

the Gulf Coast is facing the highest predicted sea level rise

in the United States.

Many of our barrier islands could vanish

in as little as a human lifetime.

Nowhere else in North America

is the balance between land and water so uncertain.

Padre Island stretches for more than a hundred miles,

from Corpus Christi in Texas almost to the Rio Grande,

the longest barrier island in the world.

It protects the South Texas mainland, and with it,

one of the most endangered mammals in the whole United States.

At the very southern tip of Texas,

a few miles inland from the Gulf Coast,

lives an animal so rare

that just one big hurricane could wipe it out here.

Few of us will ever catch a glimpse of it.

But it's a real American beauty.

An ocelot.

Usually found in South America,

here in the United States,

fewer than a hundred of these secretive cats survive.

After decades of hunting and habitat loss,

these pockets of thorn scrub

are their last U.S. outpost.

Hidden cameras give us

a rare opportunity to step into their little-known world.

At night, this mom brings her kittens

out of their hiding place in the brush.

A chance for them to play

and burn off energy.

They're small and agile enough to move easily

through the thorn scrub.

Even fully grown, ocelots are only twice the size of a house cat.

Mom's busy trying to find food...

...while the kittens are more interested in jumping on each other.

But it's good practice for pouncing on prey.

They're curious about everything.

Just as with domestic cats,

scent glands in their cheeks leave a unique tag as they nuzzle.

A messaging service that will help them carve out their own territories.

Mom's hunt has been successful.

She's caught a wood rat.

But her kittens will have to work for dinner.

It's a tad underdone.

Handing over live prey is an essential way

to train her young how to hunt.

A skill they'll need to make it on their own.

This little family is crucial to the future of American ocelots.

Their world is a fragile one,

their space precious.

But these cats have some unexpected guardians.

They live on a working ranch

where they're granted the space they need

by ranchers who value wildlife

as much as turning a profit.

The future of all our wild neighbors

depends on a willingness to protect their homes.

And in the dynamic environment of the Gulf Coast,

that means preserving the delicate balance

between land and water

so life can continue to thrive

in this, the most wonderful water world in the Americas.