Simpsons The XXX Parody (Simpsons: The XXX Parody)

When you look down on the Earth's surface,

it's impossible not to be impressed

by the sheer grandeur, splendour and power

of the natural world.

It's been ten years since we explored these wonders

in the first series of Planet Earth.

And since then, much has changed.

We can now show life on our planet

in entirely new ways,

bring you closer to animals than ever before,

and reveal new wildlife dramas for the very first time.

But that's not all.

The planet has changed, too.

Never have those wildernesses been as fragile

and as precious as they are today.

At this crucial time for the natural world,

we will journey to every corner of the globe

to explore the greatest treasures of our living planet

and reveal the extreme lengths animals go to to survive.

Finally, we will explore our cities

to see how life is adapting to the newest habitat on Earth.

This is Planet Earth II.

There are hundreds of thousands of islands,

each one a world in miniature.

A microcosm of our living planet.

The struggles to survive on these remote lands

reflect the challenges faced by all life on Earth.

The tiny island of Escudo off the coast of Panama,

home to the pygmy three-toed sloth.

This is a male, and life here suits him well.

Mangroves provide all the leaves he can eat

and there are no predators to worry him.

Island life may seem idyllic,

but it comes at a price.

There are only a few hundred pygmy sloths in existence,

and he needs a mate.

That's an enticing call…

…from a female

somewhere out there.

And this, for a sloth, is a quick reaction.

The problem is there's deep water between them.

So what should any red-blooded sloth do?

Swim, of course.

Could this be her?

He does his best to put on a turn of speed.

But she's not the one.

She already has a baby

and she won't mate again until it leaves her

in about six months' time.

Even life on a paradise island can have its limitations.

But at least she can't be far away.

The world's entire population of pygmy sloths

is isolated on a speck of land no bigger than New York's Central Park.

The size of an island has a huge influence

on the fate of those cast away there.

The island of Komodo in Indonesia.

Home to dragons.

Ten feet long and weighing an impressive 150 pounds,

these are the largest living lizards on the planet.

It's unusual to find large predators on islands.

Yet, for four million years, the Komodo dragon has dominated here.

It might seem there wouldn't be enough food

to support such giants on this relatively small island,

but reptiles, being cold-blooded,

need only about a tenth of the food a carnivorous mammal would.

A single meal will last a dragon a month.

They're so successful, that their only serious competition

comes from others of their own kind,

and there are some 2,000 of them here.

This giant however, isn't looking for food.

He's looking for a mate.

Female dragons come into season only once a year.

She is receptive.

So far, so good.

But he strayed into someone else's patch.

Another huge male thinks he is the king here.

Space being limited on islands, dragon territories overlap,

and that creates continual conflict.

In dragon society, size is everything.

But if rivals are closely matched, the outcome can be uncertain.

Muscular tails strike the power of sledgehammers.

And their serrated teeth are as sharp as steak knives.

Each tries to topple his opponent.

Defeated.

Only the most powerful dragons win the right to mate.

The limited food and space on the small islands

can often lead to intense competition.

But some islands are immense.

More like miniature continents.

And these provide opportunities for life to experiment and evolve.

Madagascar is one of the biggest islands

and also one of the oldest

having split away from Africa over 120 million years ago.

With time and isolation, its animals have adapted

to take advantage of every avaliable niche.

The island now has some 250,000 different species,

most found nowhere else on Earth.

These are not monkeys, but lemurs.

From a single ancestor, about a hundred different types have evolved.

The largest the Indri, seldom comes down from the branches.

The much smaller ring-tails wander in troops across the forest floor

searching for fruit.

And tiny bamboo lemurs eat nothing except bamboo.

With few competitors,

lemurs have been free to colonise almost every environment on the island,

even the most extreme.

This baby sifaka has a hard life ahead of it.

He's been born in the most arid and hostile corner

of Madagascar's vast landscape.

If he is to survive here, he has much to learn.

The spiny forest is like a desert.

It rarely rains, so water and food is very hard to find.

Moving from tree to tree is a perilous business.

Here, nearly all the plants are covered with ferocious spines.

His mother searches the treetops for the youngest leaves.

They provide the only food and water to sustain the family.

At three months old, the youngster is starting to explore.

All too soon, he will have to fend for himself up here.

But it's altogether easier to stay on Mother's back.

If he can master the strange ways of this forest

he will have a little corner of Madagascar to himself.

Island life encourages animals to do things differently,

and on some islands, that is essential.

There are islands still forming today

built by volcanoes.

Some erupt explosively,

others pour out rivers of molten rock,

lava.

In the last 50 years,

10 new volcanic islands have been formed.

Newly created and often remote, they're hard for colonists to reach.

Even those that do, find these are tough places to survive.

This is Fernandina,

one of the Galapagos Islands in the Pacific.

Young and still volcanically active, it's a desolate place.

The surrounding sea, however, is particularly rich with life,

and the frontier between these two very different worlds

is the home of one of the strangest of reptiles,

sea-going iguanas.

They are vegetarians,

but since there's little food for them on the land,

marine iguanas graze on the sea floor.

A big male like this one can dive to 30 metres

and hold his breath for half an hour.

There are more than 7,000 individuals on Fernandina alone.

And by bringing nutrients from the sea to the land,

the iguanas help other animals to survive here, too.

Crabs feed on dead skin on the iguanas' back

and, in turn, provide a welcome exfoliation service.

While smaller lizards prey on the flies that pester the colony.

But not all the relationships on this island are so harmonious.

Marine iguanas lay their eggs in sand.

In June, when the hatchlings emerge, they're vulnerable.

They must join the adults at the edge of the sea.

But the journey will be a dangerous one.

Racer snakes.

The snakes missed their chance.

But more babies are hatching.

And now the snakes are on the alert.

This is the best feeding opportunity they will get all year.

On flat ground a baby iguana can outrun a racer snake.

But others are waiting in ambush.

Another hatchling has its first glimpse of a dangerous world.

A snake's eyes aren't very good, but they can detect movement.

So if the hatch ling keeps its nerve, it may just avoid detection.

A near miraculous escape.

The lucky survivors

can begin learning the unique way of life

demanded by this hostile island.

Although marine iguanas are expert swimmers,

they can't cross open oceans.

But even the stormiest waters

are no barrier for birds.

Gale force winds and cold temperatures

make the subantarctic islands off New Zealand

particularly unwelcoming in winter.

But when the brief summer comes, temperatures rise and winds slacken.