Original subtitles

(SWEEPING ORCHESTRAL MUSIC)

(BIRDSONG)

(CHEERFUL DRUM RHYTHMS)

NARRATOR: Here in the tropical far north of Australia,

heavy rain and high temperatures conspire to create ideal conditions

for huge trees to grow.

With only a thin layer of fertile soil

to nourish their shallow roots,

these giants have thrown down buttresses

to support their expanding girths.

(DRUM RHYTHMS CONTINUE)

Their heads are literally lost in the clouds,

seeking light to photosynthesise.

If these treetops could talk,

they would have truly epic tales to tell...

..for they've been around for a very long time.

Their ancestors would have sheltered dinosaurs.

Indeed, some would argue these magnificent forests still do.

(DRUM RHYTHMS CONTINUE)

With its killer claws and bizarre head casque,

the southern cassowary certainly looks the part,

roaming through the oldest tropical rainforest on Earth.

Cassowaries are thought to have been on Planet for 25 million years.

They can only be found in four places today -

in Papua New Guinea and three pockets of rainforest in Australia.

The most accessible of these is the Daintree,

in Far North Queensland.

A botanical treasure 180 million years in the making.

(MAJESTIC MUSIC SWELLS)

Female cassowaries are larger than males.

They can be as tall as two metres and weigh up to 75kg.

They have thick muscly legs covered in scaly skin,

and huge three-toed feet

with massive daggerlike claws on their inside toes.

Up to 12cm long, these claws have two main functions -

to dig for fruit buried on the forest floor,

and to defend their territory and honour.

(DRUM RHYTHMS)

Cassowaries do not roam through the jungle looking for a fight,

but they can be a little feisty,

especially when there are chicks around.

The males aggressively guard their young.

Cassowaries have a strange helmet, called a casque,

Scientists are not 100% sure what it's for,

but many believe it's a sexual ornament,

helping both sexes to evaluate

the quality and fitness of a potential partner.

It's spongy in texture, rather than bony.

So, it possibly acts as a resonating device,

helping to amplify the low booming sound cassowaries make

when danger threatens.

It's impossible to overstate how important these ancient birds are

to the survival of the rainforest.

Cassowaries eat fruit, and lots of it.

So, they play an essential role in dispersing seeds,

complete with a load of fertiliser.

One cassowary scat can contain hundreds of seeds,

which means potentially hundreds of new trees,

but it's not just the quantity that counts, it's the variety.

These hungry birds eat over 200 different species of fruit.

The cassowary has become the accidental farmer of the rainforest.

Many scientists believe that if these birds were not around,

the complex rainforest ecosystem would just cease to exist.

Cassowaries are generally solitary birds.

Each female has a home range which overlaps that of several males.

During mating season,

the female will mate with one or more of the males in her home range.

After a brief courtship, she will lay her eggs,

then leave the male to guard and incubate them.

Assuming he does that successfully,

after 50 days, three to five stripy chicks will emerge.

The male cassowary then spends the next eight to 18 months

raising his offspring

before they are ready to fend for themselves.

It takes another 1.5 years for young cassowaries to reach maturity

to be able to breed themselves, and in so doing,

contribute to the recovery of their population in the wild.

NARRATOR: While many creatures in the jungle may frighten or repel,

there's one species we humans have no trouble at all relating to.

The orangutan.

We share a whopping 28 physical characteristics with orangutans,

leading some scientists to believe they are our nearest relatives.

Orangutans live on one of two remote islands in South-East Asia -

Sumatra and Borneo.

Borneo is a mysterious place,

shrouded in mist and mystery.

It straddles the equator,

so, it's hot, wet, and covered in lush, dense rainforest.

The perfect home for these magnificent, intelligent animals.

Orangutans are the only great apes of Asia.

They spend at least 90% of their time in the forest canopy,

eating, snoozing, or just hanging around.

Despite their laidback attitude,

orangutans can move fast if they need to.

Their arms are long and strong and span nearly 2.5 metres.

Both hands and feet have opposable thumbs for gripping onto branches.

Their hands are very similar to ours,

as is the enamel on their teeth,

their long hair, and shoulder blades.

But curiously, orangutans do not have toenails on their big toes.

(CHEERFUL DRUM RHYTHMS)

We share 97% of our DNA with them,

and just as much time, as a species, caring for our young.

Unlike most animals,

female orangutans do not have babies

until they're about 15 or 16 years old.

They carry their young for up to five years,

and are happy to breastfeed them until they are eight years old.

At ten years old, the children leave home,

but they regularly come back to visit their mothers

for a further five years.

The theory is that a long childhood

is linked to the animals' large brain.

It gives the young orangutans time to learn many skills

and behaviour patterns from their mothers.

Orangutan fathers play no direct role in rearing their offspring.

They live a solitary life,

only getting together with the others to mate

or to fight other males for a mate.

Dominant males can be easily identified

by their hard-won battle scars

and prominent flanges on their faces.

Males without these cheek flaps are subordinate,

and do not get to mate with a female.

The latest research suggests that dominant males may exude a hormone

that prevents the other males from reaching full maturity,

but once the top man dies,

a subordinate male will grow in size and stature,

developing the facial flanges to show his supremacy.

(SWEEPING ORCHESTRAL MUSIC)

(PEACEFUL CHIME MUSIC)

The tropical jungles in the heart of Borneo

are home to over 350 different bird species,

but the biggest drawcard among birdwatchers

are the extraordinary hornbills.

Eight of the world's 45 hornbill species can be found here,

including the oriental pied hornbill.

The males have an almost comically large bill

with a pronounced casque.

Similar to the cassowary's multifunctional helmet,

it too is thought to amplify sound.

Hornbills are the only bird family

to have the first two vertebrae in their neck fused,

most likely to support the weight of their top-heavy beaks.

Recent studies suggest they double as radiators,

helping hornbills to regulate their body temperature,

controlling the amount of heat they need to lose or conserve,

depending on the time of day and ambient conditions.

(TINKLING MUSIC)

Hornbills have distinct eyelashes -

modified feathers that protect the birds' eyes

from flying insects and debris.

While many jungle animals spend the bulk of their lives

in and around the treetops,

others quietly prowl through the undergrowth.

This is a prime habitat for Borneo's top predator,

the clouded leopard.

The smallest of the big cats,

these striking felines are shy and secretive.

Of all the animals living in the jungles of South-East Asia,

great cats remain the most elusive.

(ROLLING GUITAR RHYTHMS)

Sightings of tigers in the wild are particularly rare,

and becoming rarer by the day,

as humans continue to encroach on their habitat

and hunt them for their organs and pelts.

The largest of all cat species,

tigers are the ultimate apex predators,

with muscular legs, retractable claws,

and a mouth full of teeth tailored to specific tasks -

taking down prey, tearing flesh from bone, and chewing.

(GUITAR RHYTHMS CONTINUE)

They were once the kings of these jungles,

stretching from India to north-east China,

and from the Russian Far East to Sumatra,

but over the last century,

their numbers have fallen by 95%.

A global conservation campaign

has stopped their numbers from diminishing further,

but it will be years before they regain their standing

in what remains of their natural domain.

With fewer than 4,000 tigers left in the wild,

zoos now play an important role in ensuring their protection,

giving visitors a chance to better understand

their behaviour and hunting prowess.

(STIRRING PIANO MUSIC)

Tigers breed well in captivity.

So, there is a chance these cubs and their future offspring

might one day play a role

in ensuring the survival of wild populations

throughout the world.

(DRUM RHYTHMS)

NARRATOR: While many rainforest animals will do all they can

to avoid being seen,

our next jungle dweller is a veritable show-off.

It's spent thousands of generations

evolving the most ostentatious feathers of any bird on Earth.

There are around 40 different species of these striking birds,

each with a unique combination of bright colours and ornate feathers.

Collectively, they are the birds of paradise.

Some live in tropical Australia and eastern Indonesia,

but most have made a home for themselves in Papua New Guinea.

Papua New Guinea is a very special place.

It's a land of extremes.

The world's largest and highest tropical island,

New Guinea has massive ice-capped mountains

and deep steamy valleys filled with jungle.

It's a place of mystery - of unexplored valleys,

with species that are yet to be discovered.

The perfect setting for birds of paradise.

Most females are a drab brown,

but the males are simply resplendent.

The male will spend ages preparing a stage on which to perform.

It could be a branch of a tree or a clearing on the forest floor.

Once a potentially curious female arrives,

the show begins in earnest.

(DRUM RHYTHMS)

Each species of bird puts on a unique dance

to try to seduce the female,

and some displays may last several hours.

Females can spend six weeks watching dance after dance

before they select their mate.

After all this work,

many males may not get selected at all.

Another feathered family

living deep in the rainforests of Papua New Guinea and Australia

are the bowerbirds.

Many of the 18 species that comprise this group

have beautiful feathers worthy of attention,

but the male bowerbird's preferred method of seduction is architecture.

To attract a mate,

the satin bowerbird will build an elaborate set.

It is not a nest -

rather, a stage where he will perform a special dance

to show off to the ladies.

These are always located on the ground,

and can be up to two metres long.

The quality of the bower and the male's prowess on the dancefloor

determine courting success.

But in some species,

females may also assess the feathers of a potential breeding partner,

as a glossy, satin like sheen would indicate their overall health.

Bowers are decorated with colourful natural objects,

such as berries, snail shells, or feathers from other birds.

Where habitat borders suburbia,

bottle tops, pegs,

and bits of brightly coloured glass and rubbish are used.

Many satin bowerbirds show a preference for blue objects,

perhaps because this helps to accentuate their own colour.

(TINKLING INSTRUMENTAL MUSIC)

There is no honour among thieves,

and male bowerbirds, even those of a different species,

will sabotage another's bower and steal his treasures

in an effort to have the best-looking structure

in the neighbourhood.

(SWEEPING ORCHESTRAL MUSIC)

(UPLIFTING ORCHESTRAL MUSIC)

The rainforests of Australia and Papua New Guinea

are also home to the world's only megabats,

but some species are not restricted to this habitat.

Indeed, some manage to live right in the heart of major cities.

The Botanic Garden in Sydney has long provided a safe roost

for a huge number of grey-headed flying foxes,

the largest of the four megabat species.

(BATS CALL)

It has a whopping one-metre wingspan.

Bram Stoker never made it to Australia,

but these creatures certainly look

like they were the inspiration for Dracula.

Unlike vampire bats

and those fictitious beasts in the horror movies,

flying foxes do not drink blood.

In fact, they don't eat meat at all.

Their favourite foods are fruit, seeds, and nectar.

Every night they fly out from their roosting sites in huge numbers

to search for a feast...

..flying hundreds of kilometres if necessary

to get to a favourite stand of trees in flower.

(BATS CALL)

Here in Elsey National Park,

in the Northern Territory,

flying foxes are forced to drink on the wing

in an effort to reduce any associated risk.

Hiding just below the surface,

freshwater crocodiles are waiting to capture their next meal.

Timing is everything,

on the part of the crocodiles and the flying foxes,

whose lives can be snuffed out in a heartbeat.

The whole safety in numbers strategy won't work for everyone...

..but those that safely run the gauntlet return to their camps

to rest during the day.

(GENTLE INSTRUMENTAL MUSIC)

Flying foxes breed at a slower rate

compared to other medium-sized mammals.

Females take 1.5 years to reach breeding age,

and generally give birth to one pup at a time,

but in large colonies such as this,

that can mean a few thousand extra mouths to feed.

As the seasons progress,

different tree species across the flying foxes' range

bear flowers or fruit.

So, the colony will come into contact

with a huge range of trees across a vast area.

As they eat, they pollinate the trees,

and as they defecate on the wing,

they disperse seeds far and wide.

(UPLIFTING MUSIC SWELLS)

Flying foxes are keystone species -

an essential part of the rainforest's life cycle.

Without them, these forests would not be able to keep reproducing,

and all the species that depend on these forests

would not survive either.

Their nomadic and migratory ways

help drive biodiversity in this region.

(UPLIFTING MUSIC CONTINUES)

It's hard to imagine, looking at this mass of animals,

but flying foxes are listed as vulnerable.

They're being wiped out by a perfect storm of causes.

Conservationists and scientists are suggesting

that if things don't change, and change quickly,

the flying fox may well be extinct by 2050.

(ROLLING GUITAR RHYTHMS)

NARRATOR: Australia's rainforests provide a home

for a vast array of creatures...

..and the best time to see many of them is at night.

With keen eyes and a powerful torch,

it is possible to surprise many nocturnal creatures,

particularly spiders and reptiles.

Forest huntsmen do not build webs to catch prey.

They hunt and forage for food,

mainly insects and other invertebrates

creeping through the undergrowth.

They hide during the day to avoid being eaten themselves,

principally by birds.

A spotlight won't intimidate a forest huntsman,

for despite having eight beady eyes,

it detects prey through vibration.

(MYSTICAL CHIMING MUSIC)

The amethystine, or scrub, python, is Australia's largest snake,

growing to eight metres long.

Like all pythons and boas, it's not venomous snake.

It kills by coiling itself around its prey

and squeezing until the victim's heart stops beating.

Heat-sensing pits along its lips

allow it to detect warm-blooded prey...

..and flexible muscles and ligaments in its lower jaw

stretch so the python can swallow large animals,

such as birds, bats, and wallabies.

Because the amethystine can eat large prey,

it doesn't have to eat very often -

maybe once or twice a year.

Despite its enormous size,

the amethystine poses no major threat to humans.

They're quite shy

and unlikely to attack unless threatened or accidentally disturbed.

The Boyd's forest dragon is another handsome reptile

that is relatively easy to find and observe

on a spotlighting tour in the wet tropics.

This particular dragon is unique among lizards,

as it does not need to draw energy from the sun to survive.

It regulates its body temperature to the surrounding vegetation.

A handy skill to have

to counteract the heat-sensing ability of the amethystine.

These well-camouflaged lizards like to eat stick insects

that have a preference for eating new leaves.

When a Boyd's forest dragon needs to feed,

it will hang around in a spot

it knows the stick insects will find irresistible...

..patiently waiting for a potential meal to arrive.

As they have less stored energy to expend,

they will stay quite still for a long time,

fixed to a tree limb or vine.

So, it's easy to get a close and prolonged encounter

with one in the wild.

(JAUNTY INSTRUMENTAL MUSIC)

The most spectacular-looking python in the Queensland rainforest

is the green tree python.

It is small by Australian snake standards -

around 1.5 metres long -

but it is very good at ambushing its prey.

Tree pythons will often lie motionless on a low branch,

waiting for a potential meal to wander within striking distance.

Young pythons are not born green,

but begin life bright yellow or orange.

So, whether young or mature,

this beautiful snake is a real jewel of the jungle.

(SWEEPING ORCHESTRAL MUSIC)

(JAUNTY INSTRUMENTAL MUSIC)

Most jungle animals can be hard to see in the wild.

When they hear us coming, they run or fly away.

But one creature that has difficulty effecting an escape is the sloth.

It's the slowest mammal in the world.

They live in South America,

in the most famous jungle of all, the Amazon.

Their top speed is a glacial two metres per minute.

Sloths are so slow-moving, fungi and plants grow in their fur,

creating a viable habitat for hundreds of beetles

and other crawling insects.

This mini ecosystem affects the colour of their fur,

allowing them to blend into the forest foliage.

The sights and smells of the rainforest

in South and Central America can be overwhelming.

But the thing that surprises people most is the noise.

(ANIMAL CALLS)

The soundtrack to these jungles is deafening.

(INSECTS HUM, BIRDS CALL)

Insects make a constant din,

but that cacophony of whoops, howls, and chatter you hear

comes from monkeys.

The monkeys in this part of the world come in all shapes and sizes.

They represent five different primate families,

and are collectively referred to as New World monkeys.

(MONKEYS CALL)

Most New World monkeys are colour-blind.

They have similar-looking noses, and many have prehensile tails,

perfect for charging around the canopy, swinging from tree to tree.

The best swingers in the jungle are the spider monkeys.

These graceful animals can move effortlessly at high speeds

thanks to their very long limbs and tail.

You'll probably hear them before you see them,

as they're known for their distinctive screeches and barks.

The loudest animal in the jungle is the aptly named howler monkey.

You'll be able to hear these foghorns of the forest

from over 5km away.

Scientists think the loud howls prevent fights between troupes

by announcing the size and location of each group of animals.

Male howlers have evolved to magnify sound.

They have oversized throats and shell-shaped vocal chambers.

The jungles of Colombia

are home to one of the smaller New World monkeys.

The very punk-looking cotton-top tamarin.

These beautiful animals

are some of the most sociable in the New World order,

and one of the most critically endangered.

So, sightings like this in the wild are a rare privilege.

(JAUNTY INSTRUMENTAL MUSIC)

in the upper Amazon basin,

and they are quite large for a tree-dwelling species.

(JAUNTY INSTRUMENTAL MUSIC)

Feeding primarily on fruits,

they put their prehensile tails to good use,

acting as a safety anchor while their limbs are otherwise engaged.

(JAUNTY MUSIC CONTINUES)

Another familiar face in the wilds of South America

belongs to the cheeky capuchin.

They are thought to be the most intelligent

of all the New World monkeys.

Demonstrating an ability to problem solve,

they use rocks as tools,

crushing fruit in order to get at the delicious nutty kernel within.

(PLAYFUL INSTRUMENTAL MUSIC)

Another amazing place to encounter New and Old World monkeys

is South Africa.

Specifically in Monkeyland,

the world's first free-roaming, multispecies primate sanctuary.

The staff here are on a mission

to educate and foster greater understanding of our primate cousins.

The animals are not caged,

so looking for them is all part of the adventure.

There are well over 700 primates living in the sanctuary.

Spider monkeys and capuchins from South America.

Gibbons from South-East Asia.

Lemurs from Madagascar.

Indeed, it's the United Nations of primates.

These species would never encounter one another in the wild,

but somehow, they all seem to get along.

Rangers do not try to tame the monkeys

and visitors are asked not to touch or feed them.

Many inmates have been rescued from captive situations.

They may have been mistreated as pets

or experimented on in laboratories.

When they first arrive, they are given a thorough check-up

before they are allowed to socialise with their new friends.

Initially, a new resident will be placed in a cage

for their own protection,

allowing the other animals to get used to them,

and vice versa.

Other than daily food and water checks,

rangers try to avoid interacting with the new monkey.

This encourages them to become independent

and ready for release into the sanctuary.

Rangers still keep a distant eye on a newcomer,

but contact is kept to a minimum.

(JAUNTY INSTRUMENTAL MUSIC)

One of the most distinctive Monkeyland residents

is the male proboscis monkey from Borneo.

Scientists believe their rather large noses

act as echo chambers,

amplifying the calls they make to intimidate rivals,

or alternatively, attract females.

(JAUNTY INSTRUMENTAL MUSIC)

The crowd favourite here,

and in many primate exhibits around the world,

are the ring-tailed lemurs from the African island of Madagascar.

They spend more than a third of their time on the ground,

which is unusual among the lemur family...

..often striking a very yogalike pose

as they take in warmth from the sun.

(JAUNTY MUSIC CONTINUES)

There are fewer than 2,000 of these enigmatic animals

living in the wild.

But they breed well in captivity,

so their populations in zoos around the world are thriving.

Their trademark tails are longer than their bodies,

with 12 or 13 white rings and 13 or 14 black rings.

They cannot grip with their tails

as many of their primate cousins do...

..but they do use them for balance and communication.

Females are dominant and assertive,

and will enforce their status through biting and lunging,

or rearing up on their back legs,

but clearly there's little need for that here at the monkey UN.

(SWEEPING ORCHESTRAL MUSIC)

(PLAYFUL INSTRUMENTAL MUSIC)

There's one rainforest creature that well and truly shows

there's safety and power in great numbers...

..and its behaviour has taught the local humans

to be the most careful drivers in the world.

The red crabs of Christmas Island.

Christmas Island is the top of an underwater volcano

in the Indian Ocean.

The closest nation is Indonesia,

but it's an Australian territory.

(JAUNTY MUSIC CONTINUES)

And these bright red crabs have put the island on the map.

They're land crabs,

and spend most of the year living in the jungle away from the coast.

(UPLIFTING MUSIC BUILDS)

But around Christmastime, the crabs stage a remarkable event.

They march to the sea in their millions.

Much of the coast of Christmas Island

becomes a carpet of red crabs.

The crabs are a wonderful sight to behold...

..and people travel all the way to this remote island

just to witness this spectacular migration.

Human infrastructure can present challenges

for armies of small crabs on the move...

..but the locals do their best to assist them.

Plastic fences and funnels guide the crabs to safe crossing points.

The migration is the only time

red crabs break out of their lonely lives to get together.

The first wave of crabs consists of the males.

They head from their inland homes to the coast

and quickly dig themselves a temporary burrow.

The females join them, selecting their mate for the season,

and after copulating, the males head back to the jungle,

leaving the females to look after the developing eggs in their burrows.

Within about two weeks, the eggs have developed

and are ready for the next remarkable stage

of the great red crab journey.

At high tide, they carry their eggs to the water's edge,

and release them into the ocean

before returning home to the jungle.

(JAUNTY INSTRUMENTAL MUSIC)

Within a month, the eggs have hatched and matured,

and are ready to begin the air-breathing phase of their lives.

Each crab is only 5mm across,

but there are so many,

they often form a moving carpet several centimetres thick.

Once they reach the rainforest,

they find a good hiding place where they can feed and grow.

Red crabs are a keystone species.

The entire rainforest depends on them to disperse seeds

and fertilise the soil with their droppings...

..and to aerate the ground with their burrows.

It's amazing that something so small

should play such an important part in the ecology of Christmas Island.

(UPBEAT DRUM RHYTHMS)

NARRATOR: The cloud-capped mountains and secluded valleys of Rwanda

form the backdrop for one of the most extraordinary,

life-changing animal encounters on the planet.

A chance to see the last of the great silverback gorillas.

(DRUM RHYTHMS CONTINUE)

Mountain gorillas were first seen by Europeans in 1902.

Unfortunately, this discovery led to a century of gorilla decimation.

They were hunted for trophies, bush meat, and live young.

At the same time, their habitat was being compromised

to make way for more agricultural land.

As a species, they were clearly in peril.

When naturalist Dian Fossey arrived in Rwanda

to study the mountain gorilla,

she estimated there were only 240 remaining.

Today, the gorillas' fortunes have turned,

thanks to the truly heartening efforts

of a new generation of activists, conservationists,

and hard-working locals.

Zoologists believe there are now about 900 mountain gorillas

in the wild.

Mountain gorillas are the largest gorilla species.

A big male can weigh 160 kilos and be over 1.5 metres tall.

One troupe usually consists of a dominant male, the silverback...

..a few young males, some females, and their offspring.

The silverback rules the troupe,

organising the day with activities such as eating roots and leaves,

building nests to rest in,

and moving around the small home range.

Troupe home ranges often overlap,

but mountain gorillas do not fight to defend their territory.

They only get aggressive when their troupe needs protecting.

Newborn gorillas are tiny, weighing in at only 1.5kg.

They will stay with their mother for at least six years...

..first clinging to her fur and then riding on her back

before they are big enough to play, like children, really,

in the surrounding forest.

Tourism is the key to the survival of these beautiful creatures.

Rwanda has about 19 gorilla troupes

living in the Volcanoes National Park,

and ten of those are used to human visitation.

A permit to visit these remarkable animals in the wild is expensive,

but a portion of the funds raised

helps to support schools and medical centres in the region.

Protecting the gorillas' habitat and guiding work

keeps many of the local villagers employed,

so the whole undertaking is sustainable.

A win-win for the community,

and of course, the magnificent mountain gorillas.

(UPBEAT MUSIC)

The jungles of the world are some of the hardest places to get to,

requiring time, and often great physical effort...

..but they contain such an incredible profusion of life.

They never fail to impress and inspire.

The sights, the sounds, and the smells

of the world's tropical jungles

conspire to create multisensory experiences...

..that are unique and often profound.

(UPBEAT MUSIC CONTINUES)

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