0:00:04 > 0:00:07Deep in the heart of the island of Borneo
0:00:07 > 0:00:13is a lost world of forests, mountains and ravines.
0:00:13 > 0:00:16It hides an abundance of wildlife.
0:00:16 > 0:00:19And it's disappearing fast.
0:00:19 > 0:00:24Now the BBC has assembled a team of scientists, mountaineers
0:00:24 > 0:00:28- and filmmakers to explore this great unknown wilderness... - Ah, got it!
0:00:28 > 0:00:32..before it's too late.
0:00:32 > 0:00:35BBC camp, this is Steve on the Kuli team are you there, over?
0:00:35 > 0:00:42Last night on a remote peak, three climbers lost radio contact with the base camp.
0:00:42 > 0:00:46Without this we have no link whatsoever to base.
0:00:46 > 0:00:50If anything goes wrong we're really up the creek without a paddle.
0:01:09 > 0:01:13The jungle is a tough place for human beings.
0:01:13 > 0:01:16Parasites, injuries and humidity
0:01:16 > 0:01:19are all taking their toll on those at base camp.
0:01:23 > 0:01:28For environmental scientist Dr Tara Shine, it's all part of expedition life.
0:01:28 > 0:01:31The river's in floods and has been for four days,
0:01:31 > 0:01:35which means that getting anywhere is really difficult.
0:01:35 > 0:01:37And everything is damp so we all have this...
0:01:37 > 0:01:39we all are starting to smell the same.
0:01:39 > 0:01:44I think we're all eating the same stuff so our sweat is kind of smelling the same.
0:01:44 > 0:01:48And then all of our clothes smell like the same mixture of sweat,
0:01:48 > 0:01:50damp and river water.
0:01:50 > 0:01:53But worst of all, for the people who are unwell
0:01:53 > 0:01:57we have run completely out of toilet roll. It's quite nice(!)
0:02:00 > 0:02:04The team is exploring an isolated canyon called Imbak.
0:02:04 > 0:02:09Like much of the rainforest, it's under threat from logging.
0:02:09 > 0:02:14They're working with local conservationists to find and record the animals that live here.
0:02:14 > 0:02:21Their aim, to help preserve this extraordinary habitat forever.
0:02:21 > 0:02:24The special thing about Imbak is that it is a remnant
0:02:24 > 0:02:28of this pristine forest that there's hardly any of left
0:02:28 > 0:02:31and that fact that there is so much wildlife still here
0:02:31 > 0:02:37and it's all in such good condition that it really is worth them looking after into the future.
0:02:37 > 0:02:40In just a week they've had remarkable success.
0:02:43 > 0:02:47First they had an unexpected sighting of a tarsier.
0:02:48 > 0:02:52Then they discovered a healthy population of gibbons in the canyon,
0:02:54 > 0:02:58and an unhealthy population of scorpions in the base camp.
0:03:03 > 0:03:08Now part of the team is setting off on a new mission.
0:03:08 > 0:03:12It's wildlife cameraman Gordon Buchanan's biggest challenge yet.
0:03:12 > 0:03:17Tara and I are heading off in search of some elephants.
0:03:17 > 0:03:21So I think it's gonna be quite interesting
0:03:21 > 0:03:25cos they range far and wide so we're gonna have to be pretty mobile.
0:03:25 > 0:03:28Borneo is home to extremely rare jungle elephants,
0:03:28 > 0:03:31found nowhere else in the world.
0:03:32 > 0:03:37Once numerous, they're now under threat of extinction.
0:03:37 > 0:03:40These elephants roam huge distances
0:03:40 > 0:03:43and have the ability to melt into the jungle.
0:03:45 > 0:03:49The team wants to track them down and film them,
0:03:49 > 0:03:52but it won't be easy.
0:03:53 > 0:03:55Come on Gordon, get it together.
0:03:59 > 0:04:03As Tara and Gordon get started, five miles away on Mount Kuli
0:04:03 > 0:04:07another part of the team is struggling to reach the summit.
0:04:09 > 0:04:12Mount Kuli group, Kuli group. This is BBC base radio check.
0:04:14 > 0:04:18A radio failure means the climbers have lost contact with the base
0:04:18 > 0:04:20but they've decided to press on regardless.
0:04:20 > 0:04:23Mount Kuli group, Kuli group. This is BBC base radio check.
0:04:23 > 0:04:25Take it easy up there.
0:04:27 > 0:04:33The climbers are vulnerable, if they have an accident, Base Camp will have no way of knowing.
0:04:37 > 0:04:40Steve Backshall's aim as a climber is to reach the top,
0:04:40 > 0:04:43but more importantly for the expedition
0:04:43 > 0:04:48his goal as a biologist will be to find what lives at the summit.
0:04:51 > 0:04:53The rock itself is not very solid.
0:04:53 > 0:04:56Grim, you don't want to be stepping on that stuff.
0:04:56 > 0:05:01But we're the first people ever to have touched this rock, ever to have gone further than here.
0:05:01 > 0:05:04Every step is a mystery.
0:05:04 > 0:05:07He's climbed some of the world's highest mountains
0:05:07 > 0:05:13but these jungle cliffs are rain-soaked, slippery and treacherous.
0:05:13 > 0:05:15Steve's leading the climb.
0:05:15 > 0:05:20A risky but necessary job to secure a rope for his fellow climber, Tim Fogg.
0:05:20 > 0:05:24Oh, yuck!
0:05:24 > 0:05:25You've gone quiet, Steve.
0:05:25 > 0:05:27How's it going?
0:05:27 > 0:05:30Everything's revoltingly loose.
0:05:30 > 0:05:32THUNDER RUMBLES
0:05:32 > 0:05:35Oh, great(!)
0:05:35 > 0:05:36Thunder again.
0:05:36 > 0:05:40- That's not really what I want to be hearing.- No.
0:05:41 > 0:05:45Stuck up there covered in metal gear.
0:05:51 > 0:05:56Back in the base camp, a leading scientist more used to a laboratory
0:05:56 > 0:05:59is acclimatizing to jungle life.
0:05:59 > 0:06:04Dr George McGavin is from Oxford University and is a world expert on insects.
0:06:04 > 0:06:10There's a process by which the jungle migrates
0:06:10 > 0:06:13into wherever you live.
0:06:13 > 0:06:16The wet, the mud, steam.
0:06:16 > 0:06:17Love it.
0:06:17 > 0:06:20Fortunately for George,
0:06:20 > 0:06:25well over 75% of all animals in the jungle are insects.
0:06:25 > 0:06:31I sort of want to hold her still because she has got the most immense jaws on her, these huge big jaws.
0:06:31 > 0:06:33Oooh! Ow!
0:06:33 > 0:06:35Where's she gone now?
0:06:35 > 0:06:37I love my job.
0:06:37 > 0:06:43Rainforests are also home to an extraordinary variety of frogs, lizards and snakes.
0:06:43 > 0:06:47It's a passion for these creatures that has lured Professor Tyrone Hayes
0:06:47 > 0:06:50away from the University of California.
0:06:50 > 0:06:52Hello, Tyrone!
0:06:52 > 0:06:59Tyrone has arrived. After two days of I presume awkward journey.
0:06:59 > 0:07:03I lost my bet, I said he'd be here at ten.
0:07:03 > 0:07:06I lose my extra square of toilet paper!
0:07:09 > 0:07:12You made it.
0:07:12 > 0:07:14Good to see you.
0:07:14 > 0:07:16Wow! Arghh!
0:07:16 > 0:07:19George, are you OK? Are you ok?
0:07:19 > 0:07:23I think I've fractured my pelvis.
0:07:23 > 0:07:25It was a bit of an impact that.
0:07:25 > 0:07:27That was a real thump.
0:07:29 > 0:07:34Tyrone is from the States and I'm from Oxford so it's a sort of East meets West.
0:07:34 > 0:07:36Handshake across the pond.
0:07:36 > 0:07:41He's into frogs and toads and snakes which are fine, you know,
0:07:41 > 0:07:43but they have too few legs for me.
0:07:43 > 0:07:46I like things with six or more legs.
0:07:46 > 0:07:48Anything with less than six legs I find inherently dull.
0:07:48 > 0:07:52Everything's new. Everything I see will be for the first time.
0:07:52 > 0:07:56I'll do anything. I don't know if I'm ready for it, we'll find out.
0:08:01 > 0:08:08Steve's finding that Mount Kuli is a series of demanding cliff faces and gruelling scrambles.
0:08:17 > 0:08:25This mossy forest is one of the most mystical environments on the planet.
0:08:25 > 0:08:28And everything hung
0:08:28 > 0:08:31in this green carpet. It's beautiful.
0:08:31 > 0:08:34There's none of the huge trees
0:08:34 > 0:08:36we had lower down.
0:08:36 > 0:08:43Instead they're all very spindly and small
0:08:43 > 0:08:48and just fighting to get some purchase on the steep ground.
0:08:48 > 0:08:54The going has been so tough that Steve and Tim have averaged just half a mile a day.
0:08:54 > 0:08:57Now they can now look back on their progress.
0:08:57 > 0:09:01- First proper view.- Yeah.- Excellent.
0:09:01 > 0:09:02Lovely.
0:09:04 > 0:09:10Far off in the valley below Tara's picking up unmistakable signs of elephants.
0:09:10 > 0:09:16One way that you can tell how old an elephant dung is is by the flies.
0:09:16 > 0:09:19So this is super fresh warm dung
0:09:19 > 0:09:24and these flies which are slightly bigger, indicate that this is less than one hour old.
0:09:24 > 0:09:30And then by the end of four hours there's no flies which is quite a clever system.
0:09:30 > 0:09:34LOW RUMBLING
0:09:37 > 0:09:41You feel your stomach, it's as if you're kind of feeling nauseous
0:09:41 > 0:09:45and it's just these really low bassy, bassy noises.
0:10:00 > 0:10:03(So far all you can see are moving leaves,
0:10:03 > 0:10:06(you know leaves that are getting eaten.)
0:10:09 > 0:10:12To get close to the elephants without being trampled,
0:10:12 > 0:10:15they must rely on a local tracker.
0:10:15 > 0:10:20Bert works for the WWF and understands elephants better than anyone in Borneo.
0:10:20 > 0:10:22ELEPHANT TRUMPETS IN DISTANCE
0:10:29 > 0:10:32The team must speak in whispers.
0:10:32 > 0:10:36These dangerous elephants are easily spooked.
0:10:44 > 0:10:46Despite weighing over a ton,
0:10:46 > 0:10:50the elephants disappear quietly into the dense foliage.
0:10:50 > 0:10:54They travel along familiar routes between feeding grounds,
0:10:54 > 0:10:57so as a first step to saving their habitat,
0:10:57 > 0:11:01the team must keep up with them and find out exactly where they are going.
0:11:13 > 0:11:18The climbers have forced their way up 1,200 arduous metres
0:11:18 > 0:11:21and believe they're just a day away from the top.
0:11:21 > 0:11:24Brrr! Cold though!
0:11:24 > 0:11:27We've hit rock
0:11:27 > 0:11:29for the second time.
0:11:29 > 0:11:32But this time it's a far more serious proposition.
0:11:32 > 0:11:35This is right below
0:11:35 > 0:11:37the top of the ridge.
0:11:37 > 0:11:41Very, very steep, covered in all kinds of rubbish and really serious looking.
0:11:41 > 0:11:46Check it first but that hold up high left looks great.
0:11:46 > 0:11:50This isn't climbing this is gardening!
0:11:52 > 0:11:56That sounded just a little bit loose, did it?
0:11:56 > 0:11:58- Yep.- Yeah.
0:11:58 > 0:12:00The loose rock is a real worry.
0:12:00 > 0:12:05That's a real problem, you know, because you can't trust anything.
0:12:11 > 0:12:15- Can you get anything in there? - In there, yeah.- Good stuff.
0:12:17 > 0:12:21He's got to get in as much gear as possible
0:12:21 > 0:12:26because the consequences of any sort of significant fall on this just....
0:12:26 > 0:12:29don't go there that's not on.
0:12:45 > 0:12:47Any news on what you can see?
0:12:47 > 0:12:50Clouds are rolling in.
0:12:50 > 0:12:53It's beautiful over the forest.
0:12:53 > 0:12:55Excellent. Jolly good.
0:12:55 > 0:12:58And none of it has ever seen a human footprint.
0:12:58 > 0:13:02Except down there, which is where our base camp is.
0:13:02 > 0:13:04These are insects, that's for sure.
0:13:04 > 0:13:10Way down under the canopy, the two scientists are getting down to business.
0:13:10 > 0:13:12Snake hunting.
0:13:12 > 0:13:14We'll soon know if he finds one.
0:13:14 > 0:13:16There'll be a shriek.
0:13:19 > 0:13:23In the damp of the jungle a fallen tree soon begins to decay.
0:13:23 > 0:13:29Insects feed on the wood and predators move in to eat them.
0:13:29 > 0:13:32- That's a big tree.- Look inside, it's hollow all the way through.
0:13:32 > 0:13:34Oh, my goodness.
0:13:34 > 0:13:37That might be worth a little investigation.
0:13:37 > 0:13:40What was that about not going down dark holes?
0:13:40 > 0:13:43Oh, yeah, it's hollow way to the end.
0:13:43 > 0:13:46- It's amazing.- I'll go partly in and just see how humid it is.
0:13:46 > 0:13:50- Oh no, you should go in first. - I'm not going in! I've got a wife and two kids at home.
0:13:50 > 0:13:52I have a wife and child.
0:13:53 > 0:13:56If there is a snake in there that would be a bad thing.
0:13:56 > 0:13:57Oh, my goodness!
0:14:00 > 0:14:02It is absolutely vast!
0:14:02 > 0:14:07My goodness, this is spectacular.
0:14:07 > 0:14:14The roof is just covered in little tiny flying insects,
0:14:14 > 0:14:17and little tiny flies.
0:14:17 > 0:14:19It's just shaking, shaking and shaking.
0:14:19 > 0:14:24Presumably it's aware that I'm here and it's shaking to try and avoid being eaten.
0:14:24 > 0:14:28- I'm snake hunting for you, Tyrone. - Hope you don't find a cobra in there George!
0:14:33 > 0:14:37It's late in the afternoon and the mountaineers reach a plateau.
0:14:37 > 0:14:39The climb is taking its toll,
0:14:39 > 0:14:43not least on the third member of the team, the man behind the camera, Johnny Rogers.
0:14:43 > 0:14:46What about you buddy? How you doing?
0:14:48 > 0:14:51Safe to say I'm absolutely exhausted.
0:14:51 > 0:14:54Trying to get this camera up
0:14:54 > 0:14:55is hell.
0:14:55 > 0:14:57It's a nightmare.
0:14:57 > 0:15:02When you're scared and you're exhausted and torn to shreds like we are.
0:15:02 > 0:15:05Everything starts going wrong,
0:15:05 > 0:15:09every piece of kit catches on all the stuff you are going past...
0:15:10 > 0:15:15And it's just feeling like a horror story at the moment.
0:15:15 > 0:15:18But hey, we're getting there and we're closer to the top.
0:15:24 > 0:15:30Just strolling around to try and get a decent look at the peak. We came across this little fella.
0:15:30 > 0:15:32He's a rhino beetle, this is the male.
0:15:32 > 0:15:36You can see this enlarged spike or horn on its head
0:15:36 > 0:15:39that the males use for combat.
0:15:39 > 0:15:41Very impressive little fella. Look at that.
0:15:47 > 0:15:49LAUGHTER
0:15:49 > 0:15:51We've got basically everything in here.
0:15:51 > 0:15:56We've got herbivores, scavengers, we've got carnivores eating them.
0:15:56 > 0:15:59It's a whole little ecosystem.
0:15:59 > 0:16:02George has crawled 20 metres into the rotting tree.
0:16:02 > 0:16:06It's a natural sauna where humidity is 100%
0:16:06 > 0:16:09and the temperature is over 40 degrees.
0:16:09 > 0:16:13Wouldn't surprise me at all if there was, you know,
0:16:13 > 0:16:16not one new species in here but several just...
0:16:16 > 0:16:20Oh, look at that quick. Quick, quick, quick on the wall!
0:16:20 > 0:16:23Cave cricket, look at the size of it.
0:16:23 > 0:16:25Oh, wow!
0:16:25 > 0:16:31Tyrone, I've found a gecko. This is what you call a result.
0:16:39 > 0:16:41I really hope this is something good for you.
0:16:41 > 0:16:45Anything's good. Wow! Look at that.
0:16:45 > 0:16:50Anything I catch I'll take it back to make sure we have a positive ID.
0:16:50 > 0:16:52One of the goals is to identify and find as many species,
0:16:52 > 0:16:55get an idea of the biodiversity in the area.
0:16:55 > 0:16:57We're releasing everything.
0:16:57 > 0:16:59It'll come back home exactly where we caught it.
0:17:02 > 0:17:06The elephants' trail has led Tara and Gordon to the very edge of the jungle,
0:17:06 > 0:17:10and to clear signs that humans are nearby.
0:17:13 > 0:17:17They're still hunting here.
0:17:17 > 0:17:20This is an illegal device.
0:17:34 > 0:17:37ELEPHANT TRUMPETS LOUDLY
0:17:41 > 0:17:43That made me jump out of my skin!
0:17:50 > 0:17:52< LOW GROWLING
0:17:52 > 0:17:54There's something wrong.
0:17:54 > 0:17:56TRUMPETING
0:17:56 > 0:18:02The young male before them appears agitated and could charge.
0:18:02 > 0:18:05Bert edges forward alone and stands his ground.
0:18:33 > 0:18:35They're very big, scary animals.
0:18:35 > 0:18:39And their noises just really go right through your body.
0:18:39 > 0:18:43And you're very aware that in here a lot of the trees are very small
0:18:43 > 0:18:47and what you're supposed to do when an elephant comes is hide behind a tree.
0:18:47 > 0:18:51If I hide behind that tree it's not going to make any impression!
0:18:52 > 0:18:54If you run away, run away, run away.
0:18:54 > 0:18:56They are still afraid.
0:19:06 > 0:19:11After a hard day's climb, the mountaineers rehydrate their rations
0:19:11 > 0:19:13and drink out of makeshift cups.
0:19:15 > 0:19:21We're giving it a good boil, because it's river water and there's all kinds of nasties in there.
0:19:21 > 0:19:23Kill them off good and proper.
0:19:26 > 0:19:30It's not meant to be cold in the rain forest
0:19:30 > 0:19:33but we got cold today.
0:19:33 > 0:19:36I tell you what though I seriously believe
0:19:36 > 0:19:39that tomorrow we're gonna be standing on the summit.
0:19:39 > 0:19:44I think that we've done all the hard work, we've done all the real nasty thrashing.
0:19:44 > 0:19:47I reckon we're gonna get up top and it's gonna be plain sailing.
0:19:56 > 0:20:02Tara and Gordon's search has brought them to a major river.
0:20:03 > 0:20:07This group crossing to that side.
0:20:07 > 0:20:12Markings on the bank show that a herd of elephants has swum all the way across to the other side.
0:20:15 > 0:20:18This ecosystem along the sides of the river is quite special.
0:20:18 > 0:20:22It's got a really high biodiversity so even just in terms of monkeys
0:20:22 > 0:20:25there's any number that you can see.
0:20:25 > 0:20:29Different types of leaf monkeys, macaques, proboscis monkeys...
0:20:29 > 0:20:33Highly endangered, proboscis monkeys live only in Borneo
0:20:33 > 0:20:37and congregate at rivers to feed on the mangrove.
0:20:37 > 0:20:40Only the males have these bizarre noses,
0:20:40 > 0:20:44it's thought that the females find them attractive.
0:20:44 > 0:20:46Here the government has recognised
0:20:46 > 0:20:51that this ecosystem needs attention to looking after it.
0:20:52 > 0:20:55This narrow river corridor may be protected
0:20:55 > 0:21:00but it's far too small for the elephants who roam over huge areas foraging for food.
0:21:03 > 0:21:07Most of this whole area was logged in the past and the big problem now
0:21:07 > 0:21:12is that instead of an elephant meandering through a lowland forest to get to where he wants to go,
0:21:12 > 0:21:15he has to plough through somebody's plantation.
0:21:15 > 0:21:18Probably gobbles plants on the way causing quite a lot of destruction
0:21:18 > 0:21:25and so there's growing problems of conflict between people and the elephants.
0:21:26 > 0:21:30Bert finds the spot where the herd has clambered up the bank.
0:21:32 > 0:21:36The footprints and damage to crops show how recently the elephants passed through.
0:21:36 > 0:21:38Yeah, really dry and breakable.
0:21:38 > 0:21:43Here, they've barged their way into a banana crop.
0:21:43 > 0:21:47They did quite a lot of damage, didn't they?
0:21:47 > 0:21:49They really rip off big bits.
0:21:52 > 0:21:54And all the nice green shoots as well.
0:21:54 > 0:21:59The real indication of their strength is they can just pick this up
0:21:59 > 0:22:02as if it was like a stick in the ground.
0:22:02 > 0:22:06If you try and pull one of these out the ground you'd be there for about half an hour.
0:22:06 > 0:22:08There's just immense strength in their trunk.
0:22:08 > 0:22:10You see the footprint here.
0:22:10 > 0:22:12- Yeah.- It's the nail. - Ah, it's the toes.- Yeah.
0:22:12 > 0:22:15- 15 plus, yeah.- You think?
0:22:15 > 0:22:22And that, that again you tell by how much destruction, the size of the path they leave behind them?
0:22:22 > 0:22:25A decade ago this farmland was jungle
0:22:25 > 0:22:30but the elephants are creatures of habit and still try to travel along familiar routes,
0:22:30 > 0:22:33destroying crops in their path.
0:22:33 > 0:22:39In an attempt to stop them, some farmers take extreme measures.
0:22:39 > 0:22:45So they put big, something in this end, light it down there.
0:22:45 > 0:22:47Just to scare the elephant.
0:22:50 > 0:22:54They do three key things. One is they've dug this trench.
0:22:54 > 0:22:57The second is they have this electric fence.
0:22:57 > 0:23:01And the third thing is that at night when they hear the elephants they come out
0:23:01 > 0:23:06and light fires and set off these cannon to make noise and flames to keep the elephants away.
0:23:08 > 0:23:13On Mount Kuli one final cliff stands between the team and the summit.
0:23:13 > 0:23:17With only enough room for one man at a time,
0:23:17 > 0:23:21Steve will film himself as he climbs.
0:23:25 > 0:23:28Two cameras in the helmet.
0:23:28 > 0:23:30One looking forward to see what I see.
0:23:30 > 0:23:33One looking backwards at my face.
0:23:33 > 0:23:36Probably seeing looks of abject terror
0:23:36 > 0:23:40while I'm climbing.
0:23:40 > 0:23:44All covered with grime, overgrown
0:23:44 > 0:23:47and very, very slippery.
0:23:47 > 0:23:50As lead, climber Steve has to forge a way ahead
0:23:50 > 0:23:54without dislodging rocks that could kill his team-mates below.
0:23:57 > 0:24:02Need to keep checking all the time that the rocks are solid.
0:24:05 > 0:24:09Loose rock, look at that.
0:24:10 > 0:24:14Need to be careful that I don't send that down to the guys' heads.
0:24:22 > 0:24:28It's been a hard slog but at last the climb is almost over.
0:24:39 > 0:24:42Ah, that's it! Pretty much as far as I can go.
0:24:44 > 0:24:47I guess I'm going to have to hack my way through
0:24:47 > 0:24:49this vegetation here.
0:24:49 > 0:24:51But for the moment
0:24:51 > 0:24:54I think I'll try and set up a spot to bring the boys up.
0:24:54 > 0:24:57Sit back and enjoy the view.
0:24:57 > 0:24:59Stunning.
0:24:59 > 0:25:02All you can hear is the birds
0:25:02 > 0:25:04and cicadas.
0:25:05 > 0:25:10At the summit the climbers find an extraordinary habitat.
0:25:14 > 0:25:16This is a super spot, isn't it?
0:25:16 > 0:25:19It's all clear like a little sort of fairy garden.
0:25:19 > 0:25:22It's wonderful. Wonderful!
0:25:22 > 0:25:27That was a fantastic lead. That was absolutely fantastic!
0:25:27 > 0:25:29- Well done!- Magic, cheers.
0:25:29 > 0:25:33They are surrounded by strange carnivorous plants
0:25:33 > 0:25:37unlike anything seen lower down in the jungle.
0:25:37 > 0:25:40Up here there are pitcher plants absolutely everywhere
0:25:40 > 0:25:43and they're like little works of art.
0:25:43 > 0:25:46All this is really is a modified leaf
0:25:46 > 0:25:50which fills up with water and insects come along,
0:25:50 > 0:25:53stumble round this rim and fall in and can't get back out again
0:25:53 > 0:25:58and eventually they decompose inside and the plant uses their nutrients to grow.
0:25:58 > 0:26:03So around here there are absolutely hundreds of them. Look at them. Everywhere.
0:26:03 > 0:26:06From tiny itty bitty little ones like this
0:26:06 > 0:26:10to huge ones that can hold over two-and-a-half litres
0:26:10 > 0:26:12and have been known to catch rats.
0:26:15 > 0:26:19Back down in the lowlands, the tables have turned.
0:26:24 > 0:26:26< ELEPHANT TRUMPETS
0:26:28 > 0:26:32INDISTINCT WHISPERING
0:27:20 > 0:27:24LOW RUMBLING
0:28:01 > 0:28:05The elephants may be the strongest of Borneo's animals
0:28:05 > 0:28:08but their grip on survival is weak.
0:28:08 > 0:28:14Understanding how they live could not only save them but also their jungle home.
0:28:18 > 0:28:21There's still much more to be explored by the team
0:28:21 > 0:28:25and every species the expedition finds and records
0:28:25 > 0:28:27helps to save these remote rainforests.
0:28:35 > 0:28:37Tomorrow, as the expedition reaches the halfway mark,
0:28:37 > 0:28:41the team push even further into the heart of Borneo
0:28:41 > 0:28:43in search of the secrets of the jungle.
0:28:45 > 0:28:48Hammerhead flat worm. Bizarre!
0:28:48 > 0:28:51But not all of the animals they discover are friendly.
0:28:53 > 0:28:54HISSES