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A female western lowland gorilla.

And her newborn.

Just moments old.

For his mother,

the arrival of her young baby

is the start of a new chapter in her adult life.

Parenthood.

Her journey will be challenging.

Full of excitement...

uncertainty...

and complete commitment.

There will be mistakes. There always are.

But success for her, and, indeed, for all parents,

has perhaps the greatest of consequences.

It ensures the future of life on our planet.

Parenthood is a journey like no other.

The responsibility of providing constant food and safety

for offspring can be extremely challenging.

For most, it all begins with a good home.

A mother lion in the grasslands of the Kalahari in Botswana.

Her 20-strong pride is ruled by her and her sisters...

...who each has her own cubs.

One mighty family who help each other through thick and thin.

For months, their home is scorched by 45-degree heat.

But once a year, their territory is brought to life

by distant rains.

Up until now, these cubs

have had very little experience of water.

So their mother will have to guide them

to get them through the trauma.

Getting used to swamp living

is a vital part of their cubs' upbringing.

Because these precious waters

attract animals from miles around.

Cape buffalo.

The smell of fresh water

lures them from the surrounding savanna,

and they come in extraordinary numbers.

A herd 3 miles long and full of 1-ton animals.

They, too, cannot survive without the water

at the center of the lion's territory.

She must show her cubs that patience is their greatest ally.

Once in the swamp, the buffalo spread out into smaller groups.

Lionesses will take the lead in any hunt.

But a mother here has the added pressure

of having to teach her growing cubs how to tackle giants.

One swipe of its horns could kill any one of them.

The cubs must watch and learn.

The younger lions are allowed to be the first to feast.

Hunting giants, however, is not without its risks.

One of the pride's mothers is missing.

Contact calls go unanswered.

In attempting to provide food for her young,

she has been gored by a buffalo.

There is nothing the pride can do to help.

With her cubs too young to hunt for themselves,

her death leaves their future uncertain.

But they don't have to face it alone.

The matriarchs will take on responsibility for them.

In lion society, females often share the load of parenting.

Related adults will continue to care for the orphans

alongside their own offspring.

It'll be another year before they're fully independent.

In that time, they must be taught how to survive here.

And luckily for them,

the leader of this pride is an excellent teacher.

Parental investment is a risky strategy for many animals.

Particularly in the largest of all habitats, the ocean.

The sheer diversity of life makes some parts of the ocean

a highly competitive environment.

So the animals who choose to raise their offspring here

need to have an edge.

Here in Indonesia, protected by the reef,

lives one of the ocean's most ingenious parents.

A female boxer crab.

Attached to her underside is her brood of over a thousand eggs.

Her challenge is to keep them safe until they hatch.

Whilst keeping herself well fed.

So, like any good parent, she's come prepared with a solution.

On her claws are live anemones

that she's collected from the reef around her.

The anemones filter food from the surrounding water,

which the crab mother steals for herself.

It's an ingenious way

to keep energized while looking after young.

But it's not without risk.

To capture the food she needs,

she must take her anemones out in the open.

A cuttlefish.

A cunning predator that pounces on the unprepared.

Exposed and alone...

...she is a sitting crab.

But she isn't defenseless.

Her anemones have venomous stings

that can deter most predators.

A very effective weapon for a mother in need of protection.

In fact, her anemones are such good tools

that they are highly prized amongst the crab community.

And this mother has a jealous rival.

Empty clawed, her opponent will do anything

to secure her own anemone.

She isn't going to surrender them without a fight.

Overpowered, the mother loses one of her anemones.

The battle leaves her exhausted and vulnerable.

She needs to lie low and buy herself some time.

Because this super mum has yet another trick.

Slowly and meticulously,

she dissects her remaining anemone,

creating a clone.

Her remarkable problem-solving allows her to keep herself

and her young alive for a few more days.

Until, eventually, she's ready to let them go.

Climbing to the top of her coral home,

she begins to release her tiny offspring into the current...

...a few at a time...

...until all her crablets are independent.

Thanks to her care and attention,

she has given them an excellent start in life.

Raising offspring alone is extremely challenging.

So, many parents resort to teamwork.

A female burrowing owl is looking for a partner

amongst the wildlands of Arizona.

And this young male seems eager to please.

To win her over, he must first find a decent burrow,

and that is proving tricky.

Burrowing owls use holes abandoned by other animals.

But the ones he's found are either still in use...

...or already have well-established families.

Her patience is running thin.

When finally he's found one,

she flies in for a closer inspection.

The hallway clearly requires a little housekeeping.

Though small inside,

it's deep enough underground to keep her chicks cool

in the midday heat.

Returning to await her verdict...

...he receives a less-than-enthusiastic yes.

Over the coming weeks, she will lay one egg a day

and then incubate them all until they hatch.

His responsibility now is to provide her

with a constant supply of food.

Until, eventually, their teamwork pays off.

At first, the father's food supplies are enough

to keep their chicks growing.

But soon, both parents will have to work

to put enough food on the table.

All this constant activity inevitably attracts attention.

A roadrunner.

Fast and wily,

this opportunist could kill an entire brood of young chicks.

Their burrow has been chosen to keep them hidden from predators.

But at the first sign of danger, the chicks create a deterrent.

Their call mimics the sound of an angry rattlesnake.

But rattlesnakes are one of the roadrunner's favorite prey.

Returning with takeaway,

the father is alerted to the danger.

Disaster averted.

But now both parents are caught between

keeping a watchful eye on their chicks

and providing enough food for them

to grow large enough to defend themselves.

They work around the clock.

And their chicks' expectations are seemingly never-ending.

The parents' lives soon reach a turning point.

The growing chicks begin spending

more and more time exploring their surroundings.

And there are less demands on the parents,

as a few of the chicks become capable

of finding their own snacks.

For the parents, that is a welcome relief.

Parenthood is even harder

when the environment is working against you.

And for those parents

who need reliable fresh water to raise their young,

the conditions are rarely perfect.

The Ruaha River in Tanzania.

For most of the year,

it provides a lifeline to those that live here.

But during the dry season, this refuge almost disappears...

...leaving this mother hippo and her calf with a dilemma.

He was born just two months ago

at a time when water was plentiful.

But now there are only a few pools left

where the water is still deep enough to shield him

from the harsh sun.

The other hippos in the area have had the same idea,

so her newfound nursery has become...a little crappy.

For now, though, hygiene is the least of the mother's worries.

These enormous fountains of fertilizer

require over 100 pounds of vegetation every day.

And now, in the dry season,

that is a problem.

Good grazing is nearly 1 1/2 miles

from the safety of the river.

But it's too hot to make the journey in daytime.

She must wait until nightfall.

In the cool of the night,

the surrounding bush comes alive.

But with darkness comes the unknown.

Like it or not, the hippos must leave the safety of their pool

and head into the night in search of food.

The mother must not leave her calf alone,

so the pair begin the slow

and uncertain walk to find distant grazing.

There is some safety in numbers close to the water,

but this far into the dry season,

the best food is further away.

Their size offers them some protection.

A hippo mother is a formidable bodyguard.

Her mouth is filled with 20-centimeter ivory tusks

that serve only for defense.

But a young hippo is vulnerable.

So the calf must never stray too far from his mother.

There is an unnerving quietness to the bush around her.

But now they are too far from the water to seek refuge there,

and their stalkers know this.

A nearby male also senses danger, and he joins the mother.

Even in small groups,

hippos can defend themselves against a single lion.

But not against a pride.

The mother knows if they all hold their ground,

they might have a chance.

The less experienced male panics...

...and they lose their advantage.

The body of a young male hippo

will keep a pride fed for a week.

The mother and her calf returned to the protection of their pool.

They have had a lucky escape.

But the mother hippo's remaining refuge will soon dry out.

And she and her calf will have to travel further

and further into the unknown.

They'll need to do this every night.

All parents need dedication in the face of adversity.

The quest for food

can be a seemingly never-ending commitment for many parents.

And here in Namibia, one takes that commitment to extremes.

This female African social spider

laid her eggs just days ago.

And now her brood of 30 spiderlings

are dependent on her for food.

So, in their early life,

she regurgitates a milky liquid

which the spiderlings drink directly from her mouth.

They will grow to 10 times this size in the coming weeks.

To fuel such growth,

she will need to leave her nursery to hunt.

Luckily, this mother has family she can rely on.

50 fully grown adult sisters who share her nest.

And who hunt in perfect unison.

By stopping simultaneously,

they can listen with their feet

to detect the whereabouts of their prey in their vast nest.

Within weeks, her spiderlings

are ready to start hunting for themselves.

And as they grow,

her offspring and all their cousins become insatiable.

They're born with the ability to hunt together as a pack,

just like their mothers.

Only now, there are over a thousand of them.

Her role is almost over, which is just as well.

Since laying her eggs,

the mother's condition has been deteriorating,

and her movements have become labored.

The demands of parenthood are finally taking their toll.

But she has one more gift for her offspring.

The only thing she has left.

Her struggling appears to mimic the vibrations

of a distressed prey insect.

And her hungry spiderlings descend en masse

to their mother's dinner table one last time.

Only this time, sheis the main course.

Hers is the ultimate sacrifice,

born out of a need to ensure the survival of the next generation.

But the spiderlings are not yet finished.

They turn on their surviving relatives,

eating every adult in the colony one by one.

Until the next generation...

is all that is left.

Parental sacrifice on this scale is rare in the natural world.

Though there comes a time in a parent's journey

when all that effort seems worth it.

A female western lowland gorilla in Gabon.

She will help her young for almost four years

to learn the complexities of living in their jungle home.

But as he becomes more independent,

she must let go and allow him to acquire the rules

of a gorilla's social life.

His newfound independence triggers a crucial moment

in his mother's journey.

It gives her the chance to think about

her next stage of parenthood.

The father of her young one is reaching the end of his prime.

At 34, he's old for a silverback.

And unbeknownst to him, he is under constant assessment.

Female lowland gorillas will leave their troop

if they think there might be better options.

And that decision all boils down to one thing.

Has he still got it?

Hmm. Not bad.

Her offspring will inherit his excellent physique,

giving them a good head start in life.

Braun isn't the only thing she considers.

Though males play little part in raising their offspring,

females nonetheless prefer males with a degree of tolerance.

And the old silverback has always been good with kids.

On top of his physique and character,

she's also constantly assessing what his territory has to offer.

Wherever it comes from...

...good and plentiful food is crucial

for any mother trying to raise her young.

And variety helps parents teach their young about what to eat

and where to find it.

In the food department, he scores highly.

He even has a swamp,

which might not sound like much,

but the grasses here provide much needed protein

to a lowland gorilla's diet.

She also is looking for protection when life gets risky.

The forest elephant is not immediate competition

but a threat to young gorillas nonetheless.

Willingness to stand up to those bigger than him

is certainly attractive in a partner.

If she chose to leave, however,

there would be significant risks.

Any new male with whom she associates could kill infants

that aren't his own,

so she'll have to leave her child behind.

And it would take months to establish herself

within a new troop.

Here, at least, she already has a partner.

Just a slightly mature one.

For now, it seems he has passed her test.

But there's still time to change her mind.

Parental strategies have evolved over millennia.

But now, over 80% of the Earth's landmass

is affected by human activity,

and animal parents are having to adapt to this new world.

An endangered Iberian lynx, known as Audrina.

This abandoned barn is the best place left

for Audrina to raise her five kittens.

It's an excellent refuge for her growing family --

cool, sheltered, and full of activities for soft play.

In fact, this place is so good that Audrina is not alone.

Both her mother and her daughter

have chosen to raise their kittens here.

Three generations raising their young together.

A rare phenomenon and a sign of hope.

But the recovery of lynx here

has only been possible by what has happened outside the barn.

Less than a decade ago,

the farmers here chose to change their practice

to suit the native wild animals.

They stopped hunting

and began creating habitat amongst their crops.

And quicker than anyone had imagined,

the native animals moved back in.

First, prey,

then predators.

Soon, the farm became a safe refuge for parents like Audrina

to introduce their kittens to a world

that had been redesigned with them in mind.

One where kittens have room to explore...

...play...

...and hunt.

And they thrived.

We are beginning to understand

that it's possible to use our world for our needs

whilst also providing for wild animals.

And we are discovering that, by doing so,

it's possible to help other species.

Iberian lynx have begun a remarkable recovery,

but their fate still remains in the balance.

The future is uncertain for all parents across our world.

But what is clear is that, for all of us to survive,

we will need to help each other.

The "Parenthood" team

relied on experts all over the world.

This shoot would have obviously been impossible for us

without the help of all the amazing guides

and trackers we had.

For this project to succeed,

we need to work together with the Babongo.

It is Babongo trackers'

carefully crafted relationship with the gorillas that is key.

The "Parenthood" crew

traveled to South Africa's Malgas Island

to film the remarkable parenting story

of the endangered Cape gannet.

You can clearly see what it used to be like.

This was all nest right up until the house,

and now the colony starts way back there.

The single largest threat to the Cape gannet

is the decline of food resources.

There's not enough fish.

And what some seals have now learned is that

the gannets carry fish in their stomach.

In a day, just one day,

we can have a hundred or more predated out at sea.

As the climate heats,

rainfall is becoming less reliable everywhere.

There is often too much or too little

and at the wrong time,

a significant challenge for the "Parenthood" crews

while filming the series.

East Africa was in the grip of a historic drought,

and the consequences for both wildlife

and people became clear.

We've just been filming a group of elephants,

and they just ran into a big heed of cattle.

How do you deal with 10,000 cattle as an elephant?

It's a whole level of parenting skills

that they're not equipped to deal with.

The lack of fresh water and grass

has put both people and elephants

under immense pressure.

We have the power to help nature recover,

and sometimes it's the simplest changes

that can have the most profound impacts.

In the vast grasslands of Patagonia,

the "Parenthood" team are here to record the story

of adult guanacos and their calves.

Soon, the issues facing guanaco parents became clear.

It's estimated that fences are responsible for the deaths

of at least 30,000 guanaco in Patagonia every year.

If they just made them a tiny bit lower,

be such a simple solution,

and it would make the world of difference, I think.

If there is no guanacos,

the ecosystem will collapse.

I have a complete hope and I'm very optimistic

of the capacity of nature to recover.

While the climate changes and resources dwindle,

every community can find ways to support the natural world.

It's up to us to ensure that they and generations

to come will have a planet worth inheriting.