0:00:06 > 0:00:10Our planet is home to millions of different animals.
0:00:18 > 0:00:21The big and the powerful capture our attention.
0:00:22 > 0:00:26But there is another story to tell.
0:00:26 > 0:00:30Beneath our feet are hidden, almost magical worlds...
0:00:32 > 0:00:36..teeming with extraordinary little creatures.
0:00:36 > 0:00:39ELEPHANT TRUMPETS
0:00:39 > 0:00:42The world looks very different to them.
0:00:44 > 0:00:45A falling acorn...
0:00:46 > 0:00:48..becomes a meteor.
0:00:50 > 0:00:51A tiny trickle,
0:00:51 > 0:00:52a tsunami.
0:00:54 > 0:00:56And every enemy...
0:00:56 > 0:00:58is a giant.
0:01:06 > 0:01:09Now, using the latest technology,
0:01:09 > 0:01:13we can recreate the world from their perspective.
0:01:16 > 0:01:18In this episode,
0:01:18 > 0:01:22we enter the secret worlds of two urban jungles -
0:01:22 > 0:01:25the chaos and commotion of Rio...
0:01:27 > 0:01:30..and the futuristic metropolis that is Tokyo.
0:01:37 > 0:01:42These are dramatic tales of life inside the Hidden Kingdoms.
0:01:49 > 0:01:51BIRDS CHIRP
0:01:59 > 0:02:01HIGH-PITCHED WHISTLING
0:02:06 > 0:02:09Tiny marmoset monkeys,
0:02:09 > 0:02:13small enough to sit in the palm of your hand.
0:02:18 > 0:02:20They're a close-knit family,
0:02:20 > 0:02:23at home in the tree tops of the forest.
0:02:26 > 0:02:29But this is no ordinary forest.
0:02:31 > 0:02:34CAR ALARM BLARES
0:02:34 > 0:02:37DISTANT SHOUTING
0:02:52 > 0:02:54Rio de Janeiro.
0:02:57 > 0:02:59This vast city
0:02:59 > 0:03:02crammed with over six million people
0:03:02 > 0:03:04is eating into the jungle.
0:03:05 > 0:03:07But some jungle creatures
0:03:07 > 0:03:10are standing their ground.
0:03:20 > 0:03:23The only way to survive
0:03:23 > 0:03:26is by making the most of what humans can offer.
0:03:33 > 0:03:35For a gang of marmosets,
0:03:35 > 0:03:37finding food in the city
0:03:37 > 0:03:39means leaving the safety of the trees.
0:03:40 > 0:03:44It's a journey fraught with danger.
0:03:53 > 0:03:55HIGH-PITCHED WHISTLING
0:03:56 > 0:04:01One young male is bold enough to lead the way.
0:04:06 > 0:04:07To marmosets,
0:04:07 > 0:04:11these power cables are like tree branches...
0:04:15 > 0:04:17..if a little more slippery.
0:04:26 > 0:04:31Surveying the streets below, they can spot any opportunity for a meal.
0:04:31 > 0:04:33HORN BLARES
0:04:48 > 0:04:49The streets of Rio
0:04:49 > 0:04:53are strewn with discarded litter.
0:04:53 > 0:04:55BACKGROUND CHATTER
0:04:55 > 0:04:57CAR HORN TOOTS
0:05:01 > 0:05:03CAT MEOWS
0:05:03 > 0:05:05CAT PURRS
0:05:07 > 0:05:12But they are also patrolled by cats and dogs.
0:05:14 > 0:05:15CAT PURRS
0:05:15 > 0:05:17CAT MEOWS
0:05:22 > 0:05:27To survive, the marmosets must work as a team.
0:05:27 > 0:05:30CAT MEOWS
0:05:30 > 0:05:32HIGH-PITCHED WHISTLING
0:05:32 > 0:05:34Look-outs sound the alarm.
0:05:58 > 0:06:03Young marmosets are more inquisitive than the adults.
0:06:03 > 0:06:05INDISTINCT CHATTER
0:06:14 > 0:06:16The city is so noisy,
0:06:16 > 0:06:21it's hard to hear the others calling time to move on.
0:06:21 > 0:06:24SIRENS WAIL AND HORNS BLARE
0:06:52 > 0:06:54MARMOSETS SQUEAK
0:07:01 > 0:07:05The link to the rest of the family has been severed.
0:07:21 > 0:07:25He has no choice but to take to the streets.
0:07:26 > 0:07:29ALARM BLARES HORNS BEEP
0:07:34 > 0:07:37How can this young marmoset survive
0:07:37 > 0:07:41without the protection of his family?
0:07:41 > 0:07:44HIGH-PITCHED WHISTLING
0:07:57 > 0:07:59On the other side of the planet...
0:08:01 > 0:08:03..Tokyo.
0:08:06 > 0:08:09With well over 30 million people,
0:08:09 > 0:08:12there's barely room for any green space.
0:08:15 > 0:08:16This concrete jungle
0:08:16 > 0:08:20is one of the most inhospitable places on earth
0:08:20 > 0:08:21for wild animals.
0:08:25 > 0:08:27But there is one out tonight,
0:08:27 > 0:08:30an armour-plated mini monster...
0:08:32 > 0:08:34..a rhinoceros beetle.
0:08:36 > 0:08:40Removed from the forest, he's now a captive...
0:08:45 > 0:08:49..and a gladiator.
0:08:50 > 0:08:53- BELL RINGS - Introduced to another male,
0:08:53 > 0:08:55all he needs to do
0:08:55 > 0:08:58is what comes naturally to him...
0:09:01 > 0:09:03..fight.
0:09:12 > 0:09:16The winner is the one who throws the other on his back.
0:09:37 > 0:09:40CHEERING AND APPLAUSE
0:09:40 > 0:09:42He wins.
0:09:43 > 0:09:45BEETLE CHIRRUPS
0:09:48 > 0:09:53Beetles usually eat high-energy tree sap.
0:09:53 > 0:09:55Here, some fruit will have to do.
0:09:58 > 0:10:00Then he's back in the ring.
0:10:10 > 0:10:11For their size,
0:10:11 > 0:10:15rhinoceros beetles are the strongest creature on Earth -
0:10:15 > 0:10:20able to lift over 100 times their own body weight.
0:10:29 > 0:10:32Males with longer horns are more likely to win
0:10:32 > 0:10:37and this male's horn is as big as they get.
0:10:47 > 0:10:49But even he's not invincible.
0:10:49 > 0:10:52Nonstop fighting is exhausting.
0:10:56 > 0:10:59CROWD GROANS
0:11:12 > 0:11:15MAN SHOUTS
0:11:16 > 0:11:19No longer a hero,
0:11:19 > 0:11:21he's just an unwanted bug.
0:11:21 > 0:11:25Now the only hope for survival
0:11:25 > 0:11:28is to find an oasis amongst the concrete.
0:11:32 > 0:11:34CROWD SHOUT
0:11:57 > 0:11:59Back in Rio,
0:11:59 > 0:12:03the young marmoset is searching for his lost family.
0:12:03 > 0:12:06HORN BLASTS
0:12:12 > 0:12:14Down at street level,
0:12:14 > 0:12:16he is far from alone.
0:12:32 > 0:12:34A cane toad -
0:12:34 > 0:12:36quite at home in the gutter...
0:12:39 > 0:12:42..and poisonous to the touch.
0:12:46 > 0:12:49RATTLING
0:12:49 > 0:12:51The warning rattle of a snake...
0:12:51 > 0:12:54HIGH-PITCHED WHISTLING
0:12:54 > 0:12:58..mimicked by a burrowing owl to keep intruders away.
0:13:01 > 0:13:05Burrowing owls have adapted well to city life...
0:13:08 > 0:13:10..and even enjoy a trip to the beach.
0:13:20 > 0:13:24Rotten food isn't on the menu,
0:13:24 > 0:13:28but collecting it is all part of a plan.
0:13:34 > 0:13:37Just one more trip is needed.
0:13:39 > 0:13:44This time, to visit the local agouti.
0:13:46 > 0:13:49Agouti usually live in the forest,
0:13:49 > 0:13:54but these have come to feast on scraps left by the residents.
0:13:54 > 0:13:56CAR HORN TOOTS
0:13:58 > 0:14:02It looks like the owl has hit the jackpot, too.
0:14:11 > 0:14:15A crowd this size would never occur in the forest
0:14:15 > 0:14:18but here, food is abundant.
0:14:18 > 0:14:22The agouti barely notice one more mouth to feed.
0:14:25 > 0:14:30Cats, on the other hand, miss nothing.
0:14:41 > 0:14:46- MEOWING - The city owl is too quick for a cat.
0:14:51 > 0:14:53Back at the burrow,
0:14:53 > 0:14:57it's time to put the plan into action.
0:15:03 > 0:15:05- WHISTLING - It's not long
0:15:05 > 0:15:08before visitors are attracted to the smell.
0:15:14 > 0:15:18He's been setting a trap all along.
0:15:21 > 0:15:25Burrowing owls live on a diet of bugs.
0:15:28 > 0:15:33In the wild, owls use animal dung as bait,
0:15:33 > 0:15:36but this one has adapted brilliantly to city life
0:15:36 > 0:15:40and can now enjoy its own home delivery service.
0:15:48 > 0:15:52Life is not proving quite so easy for the marmoset.
0:15:58 > 0:16:00Without the rest of the gang to help him,
0:16:00 > 0:16:02the youngster is very hungry...
0:16:06 > 0:16:08..and very alone.
0:16:23 > 0:16:28In Tokyo, the rhinoceros beetle is not just alone,
0:16:28 > 0:16:30but still miles from any oasis.
0:16:32 > 0:16:35He does have one trick up his sleeve, though...
0:16:38 > 0:16:40..a huge pair of wings...
0:16:42 > 0:16:45..and the strength to perform a vertical take-off.
0:16:53 > 0:16:56He may have escaped the back streets,
0:16:56 > 0:16:59but flying around Tokyo's skyscrapers
0:16:59 > 0:17:01is a precarious business.
0:17:07 > 0:17:09He isn't alone.
0:17:09 > 0:17:13The sky is filled with other nocturnal bugs.
0:17:23 > 0:17:28Insects normally navigate by the light of the moon.
0:17:30 > 0:17:33Tokyo's lightscape plays havoc with their map reading.
0:17:40 > 0:17:43Light radiates in all directions...
0:17:45 > 0:17:49..and the confused bugs are lured closer and closer...
0:17:55 > 0:17:58..right into the path of a predator.
0:18:08 > 0:18:10RADAR PULSES
0:18:15 > 0:18:19The glaring lights don't distract bats.
0:18:20 > 0:18:23They see with sound.
0:18:26 > 0:18:29Listening to the echoes from its high-pitched calls
0:18:29 > 0:18:32allows the bat to form a detailed picture
0:18:32 > 0:18:34of the world around it.
0:18:55 > 0:18:58A large, clumsy rhinoceros beetle
0:18:58 > 0:19:00might seem a tempting target.
0:19:06 > 0:19:11One way to avoid capture is to drop out of the sky.
0:19:14 > 0:19:18That's one thing a heavy beetle can do well.
0:19:27 > 0:19:32Bats aren't the only animals up here feasting on the glut of bugs.
0:19:32 > 0:19:34BUZZING
0:19:36 > 0:19:40It's warmer in the busy city than in the surrounding countryside,
0:19:40 > 0:19:44so very attractive to cold-blooded geckos.
0:19:45 > 0:19:50The extra heat speeds up the lizard's metabolism,
0:19:50 > 0:19:53allowing it to strike with lightning speed.
0:19:55 > 0:19:57In the forests,
0:19:57 > 0:20:00geckos hunt on the trunks of tall trees,
0:20:00 > 0:20:04so a Tokyo skyscraper is home from home.
0:20:07 > 0:20:10Gecko feet can normally stick to anything.
0:20:12 > 0:20:17Unfortunately, the tall buildings and the warm city air
0:20:17 > 0:20:21can create a problem never found in the forest.
0:20:25 > 0:20:27The swirling currents of air
0:20:27 > 0:20:32form millions of mini tornadoes.
0:20:37 > 0:20:40There's too much turbulence, even for a gecko.
0:21:02 > 0:21:07When its grip fails, a gecko can glide to safety.
0:21:13 > 0:21:17But he's landed on someone else's patch.
0:21:23 > 0:21:28The hungry rhinoceros beetle has gate-crashed too...
0:21:33 > 0:21:38..all in the sight of the deadliest man-eater in Tokyo.
0:21:49 > 0:21:52In Rio's labyrinthine streets,
0:21:52 > 0:21:55there are endless places for animals to hide.
0:22:17 > 0:22:21A leafcutter ant has left the security of its family
0:22:21 > 0:22:23to scout for food.
0:22:23 > 0:22:25CAR DRIVES PAST
0:22:30 > 0:22:34Ants use their antennae to detect food.
0:22:38 > 0:22:41This is fuel for the colony.
0:22:54 > 0:22:56Within minutes, fellow workers are by her side,
0:22:56 > 0:22:59having followed a trail of chemicals
0:22:59 > 0:23:01that she has deliberately left behind her.
0:23:18 > 0:23:20The ants must work fast.
0:23:20 > 0:23:26Down here, exhaust fumes can create a thick toxic smog.
0:23:34 > 0:23:38Now they must take the long road home,
0:23:38 > 0:23:40back to the rest of the colony.
0:23:55 > 0:23:57As the first worker ants
0:23:57 > 0:24:01reach the safety of the underground colony,
0:24:01 > 0:24:05city life is about to come crashing in on their world.
0:24:37 > 0:24:39Washed away from the colony,
0:24:39 > 0:24:45any chance of finding the way back seems impossible.
0:24:49 > 0:24:51But there's help to guide them.
0:24:51 > 0:24:55Despite the flood, the chemical trail is still strong.
0:24:59 > 0:25:02A single gram of it would be powerful enough
0:25:02 > 0:25:06to create a trail around the entire globe.
0:25:15 > 0:25:20Such extraordinary communication and teamwork enables leafcutter ants
0:25:20 > 0:25:23to overcome whatever the city throws at them.
0:25:32 > 0:25:36The only way marmosets can keep in touch is by calling.
0:25:37 > 0:25:41For a moment, the young male thinks his calls are being returned.
0:25:41 > 0:25:43SQUEAKING
0:25:44 > 0:25:47But the noises of the city can be deceptive.
0:25:49 > 0:25:54It's not the call of his family, but the sound of a truck braking.
0:25:54 > 0:25:59Down on the streets, there are trucks everywhere.
0:25:59 > 0:26:02SQUEAKING AND RATTLING
0:26:02 > 0:26:04HORN BLASTS
0:26:24 > 0:26:29Back in Tokyo, the beetle has landed in the lair of a man-eater.
0:26:42 > 0:26:47This praying mantis is trying to attract a mate.
0:26:57 > 0:27:01The breeze will carry her scent to the city beyond.
0:27:07 > 0:27:11Out on the town, a male is quickly hooked.
0:27:13 > 0:27:17But he's aware of this lady's reputation.
0:27:26 > 0:27:29He has to exercise a bit of caution.
0:27:37 > 0:27:41This city breeze will work in his favour,
0:27:41 > 0:27:43distracting her from his approach.
0:27:56 > 0:28:00He's lucky. Most males don't even make it this far.
0:28:02 > 0:28:04Success.
0:28:06 > 0:28:08But the lady wants more...
0:28:13 > 0:28:15His head.
0:28:22 > 0:28:24It may look gruesome,
0:28:24 > 0:28:28but the extra protein that the female gets from eating him
0:28:28 > 0:28:32will actually improve the chance of his young surviving.
0:28:49 > 0:28:54A bamboo house plant provides a mantis with all she needs,
0:28:54 > 0:28:58but it's not enough for a rhinoceros beetle.
0:29:02 > 0:29:05He needs tree sap.
0:29:07 > 0:29:12The scent is on the air, but it's drawing him deeper into the city.
0:29:32 > 0:29:34Saved by his armour.
0:29:41 > 0:29:43A jumping spider -
0:29:43 > 0:29:46no bigger than a grain of rice.
0:29:51 > 0:29:56Up on a traffic light, the spider is looking for a meal.
0:30:04 > 0:30:10These spiders don't make webs. Instead, they hunt.
0:30:13 > 0:30:18Using his silk safety line, the spider gets within range.
0:30:25 > 0:30:31It locks eight eyes on the target, focuses, jumps...
0:30:33 > 0:30:35..and misses.
0:30:47 > 0:30:53In the forest, jumping spiders rarely miss their target.
0:31:00 > 0:31:03And they certainly don't miss it again...
0:31:06 > 0:31:09..and again...
0:31:13 > 0:31:14..and again.
0:31:23 > 0:31:28In red light, the spider can't judge distance properly.
0:31:38 > 0:31:40But when the light turns green,
0:31:40 > 0:31:43everything snaps back into focus.
0:31:57 > 0:32:00This time, the aim is perfect.
0:32:04 > 0:32:08Unfortunately, in a city with this much traffic,
0:32:08 > 0:32:11it's only a matter of time before the lights turn red again.
0:32:23 > 0:32:27Caught in the rush, the rhinoceros beetle hasn't the energy to fly.
0:32:30 > 0:32:34Any chance of finding sanctuary seems impossible.
0:32:52 > 0:32:55Night in Rio.
0:33:03 > 0:33:06Marmosets normally retreat to the treetops
0:33:06 > 0:33:10and huddle together for warmth and security.
0:33:11 > 0:33:14This young marmoset isn't so lucky.
0:33:16 > 0:33:22Under the cover of darkness, unsavoury characters appear.
0:33:33 > 0:33:35SQUAWKING
0:33:41 > 0:33:43SQUEAKING
0:33:45 > 0:33:49Rats are the ultimate city winners -
0:33:49 > 0:33:52opportunists that can adapt to any environment
0:33:52 > 0:33:56and consume almost anything they find.
0:34:20 > 0:34:23The city offers a tarantula
0:34:23 > 0:34:26countless places to make a burrow.
0:34:29 > 0:34:31DRAMATIC MUSIC
0:34:39 > 0:34:41MUSIC BUILDS
0:34:52 > 0:34:57Night also brings out the city's most ruthless hunter.
0:35:15 > 0:35:18Silent and supple, with superb night vision,
0:35:18 > 0:35:22cats are the kings of Rio's back streets.
0:35:27 > 0:35:31And a marmoset's worst enemy.
0:36:06 > 0:36:08CAT MEOWS
0:36:40 > 0:36:43Even a cat can't match the agility
0:36:43 > 0:36:48of a marmoset that's learnt to live on the high wires of Rio.
0:36:49 > 0:36:51CATS YOWL
0:36:58 > 0:37:03At last, dawn is near, bringing relative safety to the marmoset.
0:37:09 > 0:37:13But in Tokyo, dawn brings a beetle's nemesis.
0:37:23 > 0:37:25BIRDS CAW LOUDLY
0:37:27 > 0:37:31The skyscrapers echo with their calls.
0:37:37 > 0:37:40In the forest, beetles bury themselves in the ground
0:37:40 > 0:37:43to sit out the perils of the day.
0:37:48 > 0:37:51THUD
0:37:51 > 0:37:52A crow.
0:37:56 > 0:37:59THUDDING
0:38:02 > 0:38:06For the beetle, it's like facing a Tyrannosaurus Rex.
0:38:09 > 0:38:11With every step, the beetle tests the ground,
0:38:11 > 0:38:14looking for somewhere to hide.
0:38:33 > 0:38:36Crows are one of the world's most intelligent animals.
0:38:40 > 0:38:46They always rise to a challenge, especially where food is concerned.
0:39:11 > 0:39:15To a beetle, these wrappers are the closest thing
0:39:15 > 0:39:18to burying itself in fallen leaves.
0:39:20 > 0:39:23THUDDING
0:39:46 > 0:39:51A crow's beak can crack a beetle's armour like an egg.
0:40:29 > 0:40:32The beetle makes a break for it.
0:40:46 > 0:40:49With size comes strength -
0:40:49 > 0:40:52he can force his way between the heavy sacks.
0:41:02 > 0:41:04CROW CAWS
0:41:35 > 0:41:37CROW CAWS LOUDLY
0:41:48 > 0:41:50Safe for a moment,
0:41:50 > 0:41:55the beetle catches the scent of trees on the warm air.
0:41:55 > 0:41:57At last they're close.
0:42:24 > 0:42:30It's a temple - a sanctuary for humanity in the heart of the city.
0:42:38 > 0:42:43At last, trees flowing with delicious sap.
0:43:12 > 0:43:15The garden has attracted other beetles.
0:43:19 > 0:43:21A female.
0:43:46 > 0:43:49He's not the only male to be interested.
0:43:57 > 0:43:59At last, there's everything to fight for.
0:44:08 > 0:44:10He has lost before.
0:44:13 > 0:44:17This will be the battle of his life.
0:44:45 > 0:44:50He searches for some extra grip, then makes his move.
0:45:25 > 0:45:29For the beetle, life has just got a whole lot better.
0:45:37 > 0:45:39Back in a world he knows,
0:45:39 > 0:45:42he can now spend the rest of his short life
0:45:42 > 0:45:44surrounded by everything he needs.
0:46:00 > 0:46:04Outside this oasis in the unforgiving world of Tokyo,
0:46:04 > 0:46:08only the most resilient and most adaptable can survive.
0:46:22 > 0:46:24Dawn in Rio.
0:46:24 > 0:46:25It's now nearly a day
0:46:25 > 0:46:29since the young marmoset was separated from his family.
0:46:33 > 0:46:35Suddenly he hears them,
0:46:35 > 0:46:40far over on the other side of the road.
0:46:40 > 0:46:44The only way to them is to cross the wire
0:46:44 > 0:46:48and he's seen how dangerous that can be.
0:46:55 > 0:47:00But the alternative is the danger of life alone.
0:48:02 > 0:48:05At last, he's back.
0:48:17 > 0:48:21For any social animal, the only way to survive
0:48:21 > 0:48:26is with the support and protection of friends and family.
0:48:35 > 0:48:38Only a few animals have the skills
0:48:38 > 0:48:41to meet the challenges of city life.
0:48:43 > 0:48:46But for those who can, there are great rewards.
0:48:50 > 0:48:55With over half the world's population now living in cities,
0:48:55 > 0:49:00animals and humans are forced to live side by side.
0:49:04 > 0:49:07Wherever you are, you're never far
0:49:07 > 0:49:11from the tiny heroes of the Hidden Kingdoms.
0:49:34 > 0:49:38Marmosets are the miniature stars of Rio.
0:49:38 > 0:49:43Mastering life on the electric cables is key to their survival.
0:49:45 > 0:49:48To show the marmoset's high-wire perspective
0:49:48 > 0:49:52required a whole range of filming techniques.
0:49:52 > 0:49:57But before filming could even start, we had to find the monkeys.
0:50:06 > 0:50:10Cameraman Mark Payne-Gill and director Gavin Maxwell
0:50:10 > 0:50:12have filmed monkeys in the jungle countless times.
0:50:12 > 0:50:17Filming monkeys in the urban jungle is a whole new challenge.
0:50:23 > 0:50:26This is good down here, lots of trees and wires.
0:50:27 > 0:50:30This way. There, over there. There.
0:50:30 > 0:50:32The traffic, the people and the buildings
0:50:32 > 0:50:36make keeping up with the marmosets surprisingly difficult.
0:50:38 > 0:50:40It's a bit daunting to start with,
0:50:40 > 0:50:42all the motorbikes and all the people and all the noise.
0:50:45 > 0:50:47- I think they are up here. - Up that alley way, that way.
0:50:47 > 0:50:50Argh, this is so frustrating. They are always one step ahead of me.
0:50:50 > 0:50:54The monkeys always have the advantage of their aerial runways,
0:50:54 > 0:50:58leaving Gavin and Mark trailing behind.
0:51:03 > 0:51:06Marmosets are so agile. There's nothing in their way, really,
0:51:06 > 0:51:08whereas I've got to navigate all these streets,
0:51:08 > 0:51:11go round corners and I can lose them very quickly.
0:51:11 > 0:51:13And then, of course, they can go back that way.
0:51:14 > 0:51:18To try to beat the traffic, they head up to higher ground
0:51:18 > 0:51:19and a better vantage point.
0:51:24 > 0:51:27Just when they think they've found the answer...
0:51:27 > 0:51:29DOG BARKS
0:51:29 > 0:51:32HIGH-PITCHED WHISTLING
0:51:32 > 0:51:35RADIO PLAYS FROM CAR
0:51:42 > 0:51:44So it's not going that well.
0:51:48 > 0:51:51It's probably one of the hardest places
0:51:51 > 0:51:52I've ever come to film monkeys
0:51:52 > 0:51:56in all the years that I've been filming them in jungles, in their natural habitat.
0:51:56 > 0:52:00After three days racing round the hectic city,
0:52:00 > 0:52:04they still don't have a single decent shot of a marmoset.
0:52:06 > 0:52:09To increase their chances of finding a settled troop,
0:52:09 > 0:52:12the two decide to split up.
0:52:13 > 0:52:15I think I can hear one down here.
0:52:15 > 0:52:16'Mark, I've got some up here.
0:52:16 > 0:52:19- 'There are about four of them up on the hill now.'- I'm on my way.
0:52:19 > 0:52:21'Come on, quick, quick.'
0:52:29 > 0:52:31Gavin has found an area
0:52:31 > 0:52:35where a family of marmosets come together to socialise.
0:52:35 > 0:52:37They're doing some really cool stuff.
0:52:38 > 0:52:40Finding them is one thing,
0:52:40 > 0:52:43but now the crew need to encourage the group to stay around
0:52:43 > 0:52:45as long as possible.
0:52:45 > 0:52:47It will take time to get the monkeys used to their presence.
0:52:47 > 0:52:51We're trying to mimic their calls and make a very high-pitched call.
0:52:51 > 0:52:54So I'm going to go... Sss!
0:52:54 > 0:52:55Sss!
0:52:55 > 0:52:58That sounds nothing like them.
0:52:59 > 0:53:02A proper recording might do better.
0:53:07 > 0:53:10We're on Led Zeppelin at the moment. Hang on.
0:53:10 > 0:53:12I'm sure they like heavy metal, but not today.
0:53:12 > 0:53:14There we go, there we go. Listen to that.
0:53:14 > 0:53:18RECORDING PLAYS OF MARMOSET SQUEAKS
0:53:19 > 0:53:22It certainly seems to help and over the next few days,
0:53:22 > 0:53:24the group start to ignore the cameras
0:53:24 > 0:53:26and the crew get some key shots.
0:53:26 > 0:53:30It means we can get some really nice behaviour of them
0:53:30 > 0:53:32just doing what they do normally.
0:53:32 > 0:53:34Now it's time to get closer
0:53:34 > 0:53:36to see what life on the wires looks like
0:53:36 > 0:53:39from the marmosets' own perspective.
0:53:41 > 0:53:44We're just slowly, slowly building their trust.
0:53:49 > 0:53:53They want to get the camera as near as possible.
0:53:56 > 0:53:58But those are high-voltage cables
0:53:58 > 0:54:02and there are enough reminders that the wires are live.
0:54:08 > 0:54:11If we can get the marmosets running along the wires here,
0:54:11 > 0:54:13literally we'll be looking eye to eye to them.
0:54:25 > 0:54:26He's really using his tail then,
0:54:26 > 0:54:29to keep himself balanced when he's running quickly like that.
0:54:35 > 0:54:38From this unique viewpoint,
0:54:38 > 0:54:41the acrobatic skills of the marmosets come sharply into focus.
0:54:41 > 0:54:44How on earth does it do that? He's up on a wobbly wire
0:54:44 > 0:54:48and he leaps over another marmoset and lands on the wire again.
0:54:48 > 0:54:49That's incredible.
0:54:53 > 0:54:55They leap from wire to wire
0:54:55 > 0:54:57and for a moment they're just in midair.
0:54:57 > 0:54:58I think that looks really dangerous.
0:54:58 > 0:55:01Eventually the crew reach the limits
0:55:01 > 0:55:04of how much more they can safely achieve here.
0:55:06 > 0:55:09They will need to move to a more controlled environment
0:55:09 > 0:55:12to film their stars in any greater detail.
0:55:15 > 0:55:19Leaving the glamour of Rio behind them,
0:55:19 > 0:55:23they head to a small shed... in Cumbria.
0:55:23 > 0:55:28Here, in a wildlife sanctuary, lives a troop of marmosets -
0:55:28 > 0:55:32the high-wire stunt doubles for the next phase of the filming.
0:55:35 > 0:55:38First the marmosets' home needs to be transformed
0:55:38 > 0:55:41into a special effects studio.
0:55:42 > 0:55:44Using a blue screen will allow them
0:55:44 > 0:55:48to superimpose images of Rio in the background.
0:55:48 > 0:55:50For the marmosets themselves,
0:55:50 > 0:55:54there's a state-of-the-art slow-motion camera.
0:55:54 > 0:55:57We're going to use this to show how agile they are
0:55:57 > 0:55:59and how they can actually grip on to the wire
0:55:59 > 0:56:03and what's going on as they're moving at such high speed.
0:56:03 > 0:56:06Once the studio is set up, it doesn't take long
0:56:06 > 0:56:09for the curious marmosets to take an interest.
0:56:13 > 0:56:18Unfortunately, it's an interest in our cameras rather than the wire.
0:56:22 > 0:56:24Oi, get off my lens.
0:56:25 > 0:56:28They're everywhere except on the wire.
0:56:28 > 0:56:30The wire is over there.
0:56:31 > 0:56:33Here we go.
0:56:33 > 0:56:35It's not long before these intelligent monkeys
0:56:35 > 0:56:37are exploring the wires...
0:56:41 > 0:56:46..and it's all captured in super-slow motion.
0:56:46 > 0:56:48OK, well, that's very, very promising.
0:56:48 > 0:56:50Rolling.
0:56:57 > 0:57:01Now it's time to replicate the acrobatic leaps
0:57:01 > 0:57:02made by their cousins in Rio.
0:57:02 > 0:57:06Yeah, I guess it's exaggerated by the wide-angle lens as well.
0:57:06 > 0:57:08One at a time, they're queuing up.
0:57:08 > 0:57:13But will our stunt doubles show the same level of skills?
0:57:13 > 0:57:15- Oh, wow.- Oh, that's lovely! - Wow, that's nice.
0:57:15 > 0:57:18It's like he's floating in the air in that one.
0:57:20 > 0:57:24- Very pleased. Hello. Hello. - Oop!- He's pleased as well.
0:57:24 > 0:57:26Well, final shot of the sequence.
0:57:26 > 0:57:29What I want is a big close-up.
0:57:31 > 0:57:34It's one small leap for a marmoset...
0:57:34 > 0:57:38and one extraordinary shot.
0:57:38 > 0:57:41Hey! Brilliant.
0:57:41 > 0:57:47The Cumbrian marmosets are just as agile as their Brazilian relatives.
0:57:55 > 0:57:58Throughout the whole series,
0:57:58 > 0:58:01the combination of wild filming and special effects
0:58:01 > 0:58:03has enabled us to recreate
0:58:03 > 0:58:08the extraordinary lives of the heroes in the Hidden Kingdoms.