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00:00The World of Warcraft
00:02The World of Warcraft
00:04The World of Warcraft
00:06The World of Warcraft
00:08The World of Warcraft
00:10The World of Warcraft
00:12Experience a world beyond imagination
00:18Where fish can fly
00:22Lizards walk on water
00:28Apes
00:30Master tools
00:34And frogs
00:36Disappear in plain sight
00:40Animals do the smartest things
00:46Through every stage of their lives
00:50From leaving home
00:54To raising a family
00:58From finding food
01:02To making friends
01:08They find ingenious ways to survive
01:12Against all odds
01:14Welcome
01:20To the secret lives
01:22Of animals
01:24Our brothers and sisters
01:36Are often the first friends
01:38We make
01:40And here on the tropical shores
01:42Of Central America
01:44Almost a hundred siblings
01:48Are getting acquainted
01:54Calling from inside
01:56Their eggs
01:58Hatching their first plan
02:00An olive ridley sea turtle
02:06No bigger
02:08Than your thumb
02:10Faces a huge challenge
02:12To make it
02:14To the ocean
02:18First, he must escape
02:20His underground nest
02:22Alone
02:26His chances of getting out
02:27Are slim
02:36But working together
02:37The turtle hatchlings
02:38Tunnel through
02:39Over a foot
02:40Of sand
02:41Of sand
02:52But they still have
02:53A long way to go
02:55And danger
02:56Awaits
03:01Black vultures
03:02Are gathering
03:03And they're hungry
03:05And they're hungry
03:12Now, the genius
03:13Of the turtle's strategy
03:15Becomes clear
03:19Across this beach
03:20Thousands of nests
03:22Have emerged
03:25Up to a million
03:26Olive ridley hatchlings
03:27Can surface
03:28In a single day
03:29Some of the largest
03:32Gatherings
03:33Of sea turtles
03:34On the planet
03:43By hatching together
03:44Each turtle
03:46Improves their chances
03:47Of survival
03:50And about 80%
03:51Of hatchlings
03:52Make it to the ocean
03:59Working together
04:04They've overcome
04:05Their first
04:06Great challenge
04:07In life
04:12It just goes to show
04:13It's not only
04:14The fittest
04:15Who survive
04:17It's often
04:18The friendliest
04:29The hot
04:33Dry forests
04:34Of Costa Rica
04:39Summer temperatures
04:40Here reach a searing
04:41100 degrees
04:42Fahrenheit
04:49Life for this
04:50Troop of capuchin
04:51Monkeys
04:52Is tough
04:59They make it through
05:00These difficult times
05:01With the support
05:02Of friends
05:11But this youngster
05:12Is new to the group
05:13And doesn't have any yet
05:20He's desperately thirsty
05:22At this time of year
05:28Water
05:29Is scarce
05:32And the best drinking spot
05:35Is guarded
05:36By dominant members
05:37Of the troop
05:45But desperate times
05:48Call for desperate measures
05:52He tries his luck
06:22To get past
06:25To get past
06:26The dominant monkeys
06:29And get a much needed
06:30Drink
06:32He must make
06:33A friend
06:37And capuchins
06:38Do that in a way
06:39Unlike any other animal
06:42With an extraordinary
06:43Test of trust
06:47That involves
06:48A sensitive nose
06:53And razor sharp
06:54Fingernails
06:59Capuchins really must
07:00Pick
07:01Their friends
07:02Wisely
07:08Not quite
07:14Another lone capuchin
07:18This might be an opportunity
07:19Be an opportunity
07:29He reaches for a finger
07:33And guides it up his nostril
07:37Very carefully
07:45Now vulnerable
07:46He's showing trust
07:47He's showing trust
07:48In the other capuchin
07:52And when they return
07:53The gesture
07:56It's the start
07:57Of a beautiful friendship
08:08Together
08:09They're ready to take on the world
08:11Take on the world
08:16First stop
08:20The water hole
08:25It's still fiercely guarded
08:35The youngsters stopped in his tracks
08:38But this time
08:40Someone has his back
08:49Combining forces
08:50They confront the guard
08:52Using a distinctive tactic
08:56With double the teeth
08:58And double the power
08:59They gain the upper hand
09:04They gain the upper hand
09:10For these monkeys
09:12Two heads really are better than one
09:17And they both
09:19Finally get the drink
09:21They so desperately need
09:22Having even one friend
09:34Can be a lifesaver
09:39So imagine having hundreds of thousands
09:44An army ant
09:46One of the rainforest's smallest animals
09:48But part of one of its largest teams
09:57Up to a million strong
09:59This colony can't survive long without eating
10:05So every morning
10:07The best hunters leave together
10:09With one mission
10:11To find food
10:14And lots of it
10:18And lots of it
10:20They keep in constant communication
10:23Through smell
10:25And touch
10:31And spread out into a column
10:3320 metres wide
10:36To flush prey out of hiding
10:38Out of hiding
10:45A bush cricket
10:47Too big for an ant to tackle alone
10:51But she doesn't have to
10:58She sends out an airborne chemical signal
11:02Calling for reinforcements
11:10Her friends respond
11:12Without delay
11:24Working together
11:26Army ants can take down animals
11:28One and a half thousand times
11:30Their own weight
11:35It's a good start
11:37But they need thousands of insects
11:39To keep the colony alive
11:45And finding food is only half the battle
11:49They must now carry it
11:51The ant equivalent
11:54Of 22 miles
11:56Back
11:58To the growing nest
12:03But in a jungle full of dead ends
12:05And detours
12:09That's a mammoth task
12:13With pinpoint precision
12:15These extraordinary creatures
12:18Create their very own highways
12:19Smaller obstacles are no problem
12:29But to cross larger gaps
12:31They do something unrivalled
12:34In the natural world
12:41The ants link legs
12:43And support each other
12:47And support each other
12:49To engineer living bridges
12:53Ten times their body length
13:04These superstructures allow them to carry up to 30,000 items of prey
13:10Back to feed the colony
13:13Every single day
13:20They say a problem shared is a problem halved
13:25And often the most unlikely alliances turn out to be the most fruitful
13:30A three-toed sloth
13:42The slowest mammal on earth
13:46And a prime target for the world's most powerful bird of prey
14:00The harpy eagle
14:03The harpy eagle
14:07Capable of flying at up to 50 miles per hour
14:10And sloths are on their menu
14:15And sloths are on their menu
14:23They can't run
14:26But a special relationship might just help them hide
14:33Sloth moths
14:38Up to 120 of them live exclusively amongst a sloth's coat
14:44They may not seem like good friendship material
14:52But almost all sloths have moths as housemates
14:58And they're welcome guests
15:03Scientists don't know exactly why
15:08But the more moths living on a sloth
15:11The more algae found in its fur
15:18It's thought moths provide nutrients that help the algae flourish
15:24And algae
15:26Turns their coat
15:28Forest green
15:31Helping these laid-back leaf eaters hide
15:36In plain sight
15:37When life gets tough
15:38When life gets tough, you need friends that have your back
15:41When life gets tough, you need friends that have your back
15:46But even the strongest friendships are open to betrayal
15:51South Africa's Kalahari Desert
16:02Here, meerkats feed on grubs and bugs
16:09Hidden underground for up to eight hours a day
16:12But with their heads buried in the sand
16:15But with their heads buried in the sand, they're blind to danger
16:20To keep safe
16:23They rely on friends
16:27In high places
16:30A fork-tailed drongo
16:33From her vantage point, she can spot danger a mile off
16:49A tawny eagle
16:51A meerkat's worst nightmare
16:53The drongo sounds the alarm
16:59The drongo sounds the alarm
17:05A meerkat call confirms the danger
17:10A meerkat call confirms the danger
17:16Some friends you simply can't live without
17:19But she's not as selfless as it seems
17:26There's something in it for her
17:31A juicy grub
17:34Abandoned by the meerkats
17:39Once she's finished
17:43She lets them know
17:47It's safe to go back to foraging
17:59A scorpion
18:01A meerkat's favorite meal
18:05And so irresistible to a drongo
18:09She'll test their friendship to get it
18:17She makes another alarm call
18:23This time, it's a trick
18:26There's no sign of danger
18:30And the meerkats aren't so easily fooled
18:34So she tries something even sneakier
18:38A call they can't ignore
18:42A folkless imitation
18:47Of a meerkat's own alarm
18:50Now the drongo gets exactly what she wants
18:56Now the drongo gets exactly what she wants
19:13Sometimes she's selfish
19:15But meerkats are smart
19:22And they know they're better off with her around
19:26No friend is perfect
19:34But there are times in life when you simply can't afford to be picky
19:40The Peruvian jungle
19:46At night
19:50Here, danger lurks around every corner
19:56Especially when you're just the size of a grape
20:01Like this reticulated humming frog
20:04Like this reticulated humming frog
20:09The perfect meal
20:17For a banded cat eye snake
20:21Armed with excellent night vision
20:24And an incredible sense of smell
20:26He can run
20:35But he can't hide
20:37He can run
20:39But he can't hide
20:40If ever he needed a friend
20:57It's now
21:03A tarantula
21:05Armed and dangerous
21:08And dangerous
21:24But not to reticulated humming frogs
21:29She provides them protection
21:30Capable of attacking snakes
21:36Capable of attacking snakes
21:38Tarantulas are the jungle's most unlikely heroes
21:46This is an extraordinary friendship
21:49That few people have ever witnessed
21:52And like all the best relationships
21:55There's something in it for both of them
21:58This tarantula also has a problem
22:09Parasites she can't reach
22:13They could be irritating to her
22:17But these frogs dine out on them
22:20It's a pairing so successful
22:27That frogs and tarantulas are found living together
22:31In jungles across the world
22:39When life gets difficult
22:41There's nothing better than having someone to lean on
22:44Having someone to lean on
22:52With friendship comes great rewards
22:56Security
23:00Support
23:03Even life-saving protection
23:05Even life-saving protection
23:10It's no wonder
23:14With friends by our side
23:16We live longer
23:18Healthier
23:20And happier
23:21To film army ants building bridges
23:35The team headed to Costa Rica
23:39Welcome to the jungle
23:41In the dense rain forest
23:43Finding the ants is only possible with a highly trained eye
23:47The challenging part is that they're rare
23:49And so you often have to travel long distances through the forest to find them
23:54After several hours of searching
23:57Sean strikes gold
23:59Oh we've hit pay dirt
24:01There they are
24:03We found it
24:05Now filming can begin
24:07The bridge is the thing that we want to get more than anything else
24:12It's the best example of teamwork for me that we can receive
24:16But it's immediately clear it will be a challenge
24:20They are fast, they're small
24:23And it's just really hard to get the equipment close up to them
24:26And it's not just their speed that's a problem
24:30Nasty drop
24:31Nasty drop
24:35It's like having a hot needle stabbed into your skin
24:40I've got ants all over me
24:42Whoa, they're all over the camera
24:44They have bitten us, stung us
24:47And we're out of here
24:48We're fleeing
24:51To have any chance of filming the ants bridge building
24:55They'll need to rethink their strategy
24:58We're having to come up with some ingenious methods
25:01Of stopping them from climbing up your wellies
25:03So Mark has got gaffer tape wrapped around his boots
25:09It's an amazing simple solution
25:11It's just really slippery
25:13Today I haven't been bothered at all
25:15And that's not the team's only stroke of genius
25:18Every time an ant gets on the lens or a lead or a light
25:22We brush the ant off with our ethical ant remover
25:27But as quickly as they solve two problems
25:31A bigger one emerges
25:33Well, I just did my morning check
25:36And it's a little frustrating
25:39Because the ants are gone
25:41So we have more work ahead of us
25:43We're going to have to keep tracking the ants
25:47There's only one more day of filming to go
25:49And the team has no idea where the colony has gone
25:56Feeling a bit worried, a bit pressured
25:59Just as they're giving up hope
26:03Hope!
26:05There it is
26:07This is definitely where they're building
26:09And hopefully they'll build us some beautiful bridges
26:11The team's luck has changed
26:15Just below their feet
26:17Construction has begun
26:19So we're throwing everything at it
26:21And seeing if we can get some good shots
26:24Yeah, learning from the ants
26:26Working together as a team
26:27To try and make the most of this one opportunity that we've got
26:30But these master builders don't stop at one bridge
26:33One bridge
26:40Wow!
26:42That's beautiful
26:45You can see all their legs silhouetted against the forest
26:48How they're all interlinked
26:50It's incredible
26:52I think this is one of the greatest events in all of biology
26:55It all came down to the wire on the last day
27:01But we did it
27:07Next time
27:09Finding a partner
27:11Is a labour of love
27:12One mistake
27:16Can leave you lonely
27:18But if you show off your best side
27:24And make a good impression
27:28You might just meet your perfect match
27:33Perfect match
28:03Not anything
28:04A new thing
28:05So
28:07Was it
28:08The people
28:09Because
28:10A new thing
28:11A new thing
28:12Is that
28:13That is
28:15The people
28:17At the moment
28:19It's beautiful
28:21The people
28:22Are
28:24The people
28:25And
28:26The people
28:27Are
28:29Being
28:30The people