0:00:02 > 0:00:05The world is full of extraordinary animals.
0:00:07 > 0:00:10But how well do we really understand them?
0:00:11 > 0:00:15How do they really think and feel?
0:00:15 > 0:00:19To find out, a team of spy creatures is going undercover.
0:00:21 > 0:00:23They not only look like part of the family,
0:00:23 > 0:00:26they behave like them, too.
0:00:28 > 0:00:30Armed with the latest camera technology...
0:00:31 > 0:00:34..they are going to travel the globe
0:00:34 > 0:00:39to understand the true nature of the animals they meet
0:00:39 > 0:00:43and reveal how intelligent they really are...
0:00:45 > 0:00:49..how badly behaved they can be...
0:00:50 > 0:00:53..how important friendship is to them...
0:00:54 > 0:00:59..and if it's possible that they can truly love each other.
0:00:59 > 0:01:04What they discover will change our perception of animals forever.
0:01:06 > 0:01:10Perhaps they're more like us than we ever believed possible.
0:01:17 > 0:01:19SCREECHING
0:01:20 > 0:01:25Animals are the masters of misbehaviour,
0:01:25 > 0:01:28but what makes them break the rules?
0:01:37 > 0:01:43When it comes to causing mayhem, monkeys are the experts.
0:01:44 > 0:01:48In India, a troop of 30 rhesus macaques
0:01:48 > 0:01:50have commandeered an old water trough
0:01:50 > 0:01:53to use as their personal diving pool.
0:01:56 > 0:01:58And the bigger the splash...
0:02:00 > 0:02:02..the greater the fun.
0:02:04 > 0:02:07Spy baby macaque is perfectly poised
0:02:07 > 0:02:11to record just how mischievous they really are.
0:02:19 > 0:02:22SCREECHING
0:02:22 > 0:02:24It seems like pandemonium -
0:02:24 > 0:02:29everyone does their own thing in their own particular style.
0:02:36 > 0:02:38Even the nervous.
0:02:45 > 0:02:50It's all about having fun and soaking as many mates as possible.
0:02:58 > 0:03:03Spy macaque attracts suspicion
0:03:03 > 0:03:05but manages to escape relatively unscathed.
0:03:10 > 0:03:14But, for a real baby, a pool without rules can be frightening.
0:03:24 > 0:03:27The mother is wise to be protective,
0:03:27 > 0:03:30but perhaps things aren't quite as anarchic as they seem.
0:03:32 > 0:03:36Splash a grown-up and you suffer the consequences.
0:03:43 > 0:03:48Soak the wrong kid and his angry mother soon puts you in your place.
0:03:50 > 0:03:52SQUEALING
0:03:52 > 0:03:56It looks more serious than it is, but that's the point.
0:04:01 > 0:04:03He won't do that again in a hurry.
0:04:04 > 0:04:09Despite appearances, macaque society is highly structured.
0:04:09 > 0:04:11Everyone knows their place.
0:04:11 > 0:04:16A lull in the chaos gives the chance for a swimming lesson...
0:04:21 > 0:04:25..an anxious moment for any doting mother.
0:04:26 > 0:04:29She hovers over him, giving constant reassurance.
0:04:32 > 0:04:37It's just the encouragement he needs as he tries out his first strokes.
0:04:50 > 0:04:52He'll need plenty of practice -
0:04:52 > 0:04:55experienced macaques can swim half a mile -
0:04:55 > 0:04:57but he's off to a good start.
0:04:59 > 0:05:02But what about the high dive?
0:05:07 > 0:05:09How hard can it be?
0:05:16 > 0:05:19Climbing is the easy bit.
0:05:25 > 0:05:27Now, the moment of truth.
0:05:28 > 0:05:31It looks very different from up here.
0:05:33 > 0:05:36Miss the pool and he faces serious injury.
0:05:43 > 0:05:46But an impatient queue is forming behind him.
0:05:48 > 0:05:50He desperately tries to pick up courage...
0:05:57 > 0:05:59..but then the decision's made for him.
0:06:01 > 0:06:03SQUEALING
0:06:15 > 0:06:18Still in one piece, his relieved mother helps him out.
0:06:22 > 0:06:25Now he knows that young monkeys don't believe in rules.
0:06:31 > 0:06:33And he's not the only one learning the hard way.
0:06:52 > 0:06:56In Africa, even the largest and most caring of animals
0:06:56 > 0:06:57has a mischievous side.
0:07:00 > 0:07:06Spy egret puts his robotic life on the line at every deployment.
0:07:07 > 0:07:10Even real egrets must watch their step.
0:07:12 > 0:07:15But it's the youngsters who are always pushing the boundaries.
0:07:17 > 0:07:19It's a time when they can test their strength
0:07:19 > 0:07:21without doing too much damage.
0:07:23 > 0:07:26To help with the filming, spy egret has backup.
0:07:28 > 0:07:33This is dung cam, a camera based on a pile of elephant poo.
0:07:33 > 0:07:36It even smells the part.
0:07:37 > 0:07:39It's designed to film on the move.
0:07:41 > 0:07:45Its zoom lens can capture the elephants' every move.
0:07:49 > 0:07:53That's not all, it can release a team of spy dung balls
0:07:53 > 0:07:56to litter the savanna with yet more cameras.
0:08:01 > 0:08:04One dung ball is radio-controlled
0:08:04 > 0:08:07and can travel without any visible moving parts.
0:08:11 > 0:08:13ROARING
0:08:19 > 0:08:22With the action covered from every angle,
0:08:22 > 0:08:24it's time to see what this elephant family gets up to.
0:08:27 > 0:08:30The babies must learn the rules of behaviour at an early age.
0:08:36 > 0:08:39Wrestling older siblings is a favourite pastime.
0:08:43 > 0:08:46They learn their own strength and, crucially,
0:08:46 > 0:08:48how to play nicely with each other.
0:08:52 > 0:08:55It's the older elephants who make sure they don't cross the line.
0:08:59 > 0:09:03It takes a few years before they're big enough to do real damage.
0:09:06 > 0:09:10But as they get older, they need to be reined in.
0:09:10 > 0:09:13Those who overstep the mark soon know it.
0:09:13 > 0:09:18The rules are strict for everyone when the family is on the move.
0:09:18 > 0:09:24To follow them, spy egret and dung cam join forces.
0:09:27 > 0:09:30For their own safety, the babies must stay next to their mothers
0:09:30 > 0:09:32in the centre of the herd.
0:09:34 > 0:09:36The elephants are heading to the swamp...
0:09:41 > 0:09:45..a place to cool off as the day heats up.
0:09:48 > 0:09:51But the mud can be treacherous
0:09:51 > 0:09:54and babies must only enter with their mums.
0:09:55 > 0:09:58But this little one seems to have forgotten the rules.
0:09:58 > 0:10:01Chasing egrets is irresistible.
0:10:03 > 0:10:09But as the herd enter the swamp, the baby is being left behind.
0:10:10 > 0:10:12SCREECHING
0:10:12 > 0:10:16Realising his predicament, he looks for his mother
0:10:16 > 0:10:18and thinks he's found her.
0:10:23 > 0:10:27He tags along as the group head into the swamp
0:10:27 > 0:10:31but he's following the wrong elephant.
0:10:35 > 0:10:38With his mother nowhere to be seen, he's lost in a confusion
0:10:38 > 0:10:40of trunks and legs.
0:10:49 > 0:10:53The elephants head into the swamp without him.
0:10:53 > 0:10:55The baby is now alone and afraid...
0:11:01 > 0:11:04..while his herd appear to have forgotten him.
0:11:07 > 0:11:09SCREECHING
0:11:13 > 0:11:15He can smell that his mother is out there...
0:11:15 > 0:11:17somewhere.
0:11:27 > 0:11:31But entering the swamp alone could be deadly for one so small.
0:11:38 > 0:11:40He's really starting to panic now.
0:11:48 > 0:11:50His mother is inexperienced.
0:11:50 > 0:11:53She's only just realised her mistake.
0:12:01 > 0:12:04Both will have learnt from what happened.
0:12:08 > 0:12:11He won't misbehave while the family are travelling again...
0:12:16 > 0:12:20..and stays extra close as he's taken into the swamp.
0:12:26 > 0:12:30He's learnt the hard way why you don't go here on your own.
0:12:33 > 0:12:36His older brother heads up the rear.
0:12:36 > 0:12:40No-one is letting this mischievous baby out of their sight.
0:12:50 > 0:12:54Now, the mud bathing can begin in earnest.
0:12:59 > 0:13:03But the cheeky elephants have a message for spy egret.
0:13:11 > 0:13:15Learning to behave is even more vital in extreme environments.
0:13:17 > 0:13:21In the Canadian Arctic, it is a matter of survival.
0:13:23 > 0:13:26Arctic wolf packs live in a society
0:13:26 > 0:13:29based on close cooperation and teamwork.
0:13:32 > 0:13:35Spy wolf cub is here to record how the cubs
0:13:35 > 0:13:37learn their place in the pack.
0:13:43 > 0:13:46He's been accepted as part of the family.
0:13:48 > 0:13:52They are now confident enough to wander away from the den.
0:13:54 > 0:13:57They love to play and are equally matched.
0:14:02 > 0:14:06For now, they can safely test each other's strengths and weaknesses.
0:14:09 > 0:14:12But their rough and tumble has woken the baby-sitter.
0:14:20 > 0:14:23She may have been sleeping on the job,
0:14:23 > 0:14:26but she's responsible for the cubs while their mother is away.
0:14:28 > 0:14:32She has strict rules and one is - stay close to the den.
0:14:34 > 0:14:36It's time they were taught a lesson.
0:14:45 > 0:14:49But this wolf cub isn't showing the respect the occasion demands.
0:14:51 > 0:14:54He's not supposed to answer back.
0:14:59 > 0:15:01She tries to roll him on his back -
0:15:01 > 0:15:04this is how wolves show they know their place.
0:15:08 > 0:15:11But the message isn't getting through.
0:15:11 > 0:15:14If he doesn't learn to submit by rolling over,
0:15:14 > 0:15:17he'll never fit in with the pack.
0:15:20 > 0:15:22But he's still arguing back.
0:15:24 > 0:15:26SQUEALING
0:15:26 > 0:15:30Now, she really gets tough, pinning him to the ground.
0:15:34 > 0:15:37She won't give up until he understands.
0:15:44 > 0:15:46He's got the message now.
0:15:56 > 0:16:00Learning to submit helps avoid conflict within the pack,
0:16:00 > 0:16:02vital for animals that must work together.
0:16:04 > 0:16:08Lesson over, they now practise what they learnt on each other.
0:16:20 > 0:16:24It seems even spy cub must learn the pack rules...
0:16:33 > 0:16:36..but he soon makes a dignified recovery.
0:16:40 > 0:16:43The father howls a rallying call.
0:16:48 > 0:16:52The call is not to hunt, but to come and play in the cotton grass.
0:16:58 > 0:17:03With the rules firmly established, playtime becomes a family affair...
0:17:06 > 0:17:09..a chance for the mischievous cubs to let off steam
0:17:09 > 0:17:12and learn the value of teamwork and cooperation.
0:17:32 > 0:17:36While animals that live together must learn the rules,
0:17:36 > 0:17:38for others, it's everyone for themselves.
0:17:41 > 0:17:44Frigate birds are the original pirates of the Caribbean.
0:17:47 > 0:17:51They make a living on the high seas from skulduggery and thievery.
0:17:55 > 0:17:58Fishing boats returning with their catch make easy targets.
0:18:21 > 0:18:25Fish cams reveal the details of their criminal activity.
0:18:50 > 0:18:54Tropicbirds returning to feed their young carry yet more riches.
0:19:00 > 0:19:02A fleet of frigates follow in hot pursuit.
0:19:02 > 0:19:05They know she carries a fish hidden in her throat
0:19:05 > 0:19:07and it's one they won't let get away.
0:19:12 > 0:19:15Their technique is sheer intimidation,
0:19:15 > 0:19:17forcing the tropicbird to give up its meal.
0:19:24 > 0:19:27To gain a bird's-eye view of their nefarious ways,
0:19:27 > 0:19:30spy tropicbird braves the intimidation.
0:19:43 > 0:19:45He faces skilled assailants.
0:19:45 > 0:19:49Their slender wings and curved tails allow swift manoeuvring.
0:19:54 > 0:19:58He allows them to wait until the perfect moment.
0:20:08 > 0:20:12Real tropicbirds make more challenging targets.
0:20:12 > 0:20:15And when the frigates really put on the pressure,
0:20:15 > 0:20:18it's safer to give up without a fight.
0:20:20 > 0:20:24Show resistance and you pay the price.
0:20:26 > 0:20:28They'll shake the fish right out of you.
0:20:35 > 0:20:37There's a lot at stake.
0:20:37 > 0:20:38Fish are hard to come by -
0:20:38 > 0:20:40give it up and her young might starve.
0:20:43 > 0:20:46But these villains even work together,
0:20:46 > 0:20:50so taking the path of least resistance is tempting.
0:20:55 > 0:20:57They won't give up until they've had their fill.
0:21:02 > 0:21:04But these birds aren't here to kill.
0:21:07 > 0:21:11So, to succeed, you just have to tough it out.
0:21:11 > 0:21:14Her hungry chick drives her on.
0:21:20 > 0:21:23She's made it and her chick finally gets a meal.
0:21:28 > 0:21:31It's not just tropicbirds that are subjected to bad behaviour
0:21:31 > 0:21:33from feathered felons.
0:21:47 > 0:21:50In Antarctica, spy penguin is greeting Adelie penguins
0:21:50 > 0:21:53as they return from a two-week fishing trip
0:21:53 > 0:21:55away from their nest sites.
0:22:01 > 0:22:04He receives the same bolshie reception
0:22:04 > 0:22:06as the penguins give to each other.
0:22:11 > 0:22:14Despite their belligerent nature, they are dedicated parents
0:22:14 > 0:22:19and are rushing home to relieve their partners of nesting duties.
0:22:19 > 0:22:23The birds breed on a rocky outcrop high above the sea ice.
0:22:25 > 0:22:27Another spy penguin is filming
0:22:27 > 0:22:29the disorderly behaviour inside the colony.
0:22:32 > 0:22:35The Adelies constantly squabble over the stones
0:22:35 > 0:22:37they use to build their nests.
0:22:39 > 0:22:41SQUAWKING
0:22:43 > 0:22:46Spy Adelie is in the thick of this rabble
0:22:46 > 0:22:49as everyone steals from everyone else.
0:23:00 > 0:23:02SQUAWKING
0:23:04 > 0:23:07He may be an innocent bystander,
0:23:07 > 0:23:10but that doesn't stop him getting picked on.
0:23:13 > 0:23:16Although he's designed to get right up again.
0:23:18 > 0:23:21In case it all gets too much, he has backup,
0:23:21 > 0:23:24the other spy penguin.
0:23:26 > 0:23:29This one comes with a pebble cam.
0:23:36 > 0:23:38Egg cams are here as well...
0:23:38 > 0:23:41But they, too, get the same rough treatment.
0:23:49 > 0:23:51Here, weather changes quickly
0:23:51 > 0:23:55and it soon dampens the high spirits of the colony.
0:24:02 > 0:24:06Now, their only concern is to protect their eggs from the storm,
0:24:06 > 0:24:08so everyone hunkers down.
0:24:11 > 0:24:15Spy penguin is the only one still on duty,
0:24:15 > 0:24:19except for a straggler racing back from his fishing trip.
0:24:25 > 0:24:29Stuck on her nest for the last two weeks, his mate is hungry.
0:24:29 > 0:24:32But she'll have to stay put until the storm passes.
0:24:35 > 0:24:37Meanwhile, he has a plan to impress her...
0:24:40 > 0:24:44..use the cover of the storm to steal more stones.
0:24:47 > 0:24:50It gets easier as the blizzard gets stronger.
0:24:53 > 0:24:57Blinded by the snow storm, they become easy victims of crime.
0:25:37 > 0:25:40By the time the storm ends,
0:25:40 > 0:25:42they have one of the finest nests in the colony.
0:25:48 > 0:25:51The petty pilfering of stones is one thing,
0:25:51 > 0:25:54but a much greater crime is about to be committed.
0:25:56 > 0:25:58Better weather brings in predators.
0:26:03 > 0:26:05These are skuas.
0:26:05 > 0:26:08Their speciality is stealing eggs.
0:26:15 > 0:26:16Each Adelie has only two eggs
0:26:16 > 0:26:20and a year's investment goes into rearing them.
0:26:22 > 0:26:25But with skuas on the prowl, one can go in a flash.
0:26:42 > 0:26:44But not all eggs are quite what they seem.
0:26:46 > 0:26:50Egg cam is about to reveal what it's like to be kidnapped.
0:27:16 > 0:27:20Realising it's not the real thing, egg cam is discarded in disgust.
0:27:30 > 0:27:34Adelies may be pugnacious and dishonest,
0:27:34 > 0:27:37but they are devoted to their young.
0:27:43 > 0:27:47Each chick that makes it is a triumph against the real criminals.
0:27:49 > 0:27:53The whole process of breeding brings out the best and the worst
0:27:53 > 0:27:54in some birds.
0:27:59 > 0:28:03The rainforests of eastern Australia are the stage for perhaps
0:28:03 > 0:28:05the sneakiest criminals of the lot.
0:28:12 > 0:28:14This is the satin bowerbird,
0:28:14 > 0:28:17a creature with a bad case of kleptomania.
0:28:19 > 0:28:23He is under surveillance from a female spy bowerbird
0:28:23 > 0:28:25with a particularly beady eye.
0:28:28 > 0:28:31He builds this elaborate cradle, or bower,
0:28:31 > 0:28:33to show off his prowess and skills.
0:28:41 > 0:28:44It doesn't stop at weaving twigs -
0:28:44 > 0:28:46he likes home decor, too.
0:28:49 > 0:28:52Blue is his favourite colour.
0:28:52 > 0:28:55Bottle tops nicked from a nearby campsite
0:28:55 > 0:28:57are his proudest possession.
0:29:01 > 0:29:04He has an eye for detail, too,
0:29:04 > 0:29:07placing them precisely for maximum visual impact.
0:29:09 > 0:29:13Stage set, it's time to begin his performance.
0:29:22 > 0:29:26But he soon realises spy bowerbird is immune to his charm.
0:29:29 > 0:29:33Perhaps he'll have better luck with a real bowerbird.
0:29:35 > 0:29:37She makes all the right moves,
0:29:37 > 0:29:41entering the bower to show she's interested.
0:29:41 > 0:29:43A ring makes the perfect gift.
0:29:49 > 0:29:51Not impressed?
0:29:54 > 0:29:56How about a bouquet of flowers?
0:30:06 > 0:30:09But something is not quite right.
0:30:09 > 0:30:11The penny drops -
0:30:11 > 0:30:13he's been duped!
0:30:15 > 0:30:19This isn't a female at all, it's a young male in disguise
0:30:19 > 0:30:22and he's here to steal.
0:30:24 > 0:30:27He's part of a gang of juvenile delinquents
0:30:27 > 0:30:30roaming the forest, tricking unwary males.
0:30:31 > 0:30:35In their hideout, they display their ill-gotten gains.
0:30:37 > 0:30:41It takes up to seven years for a male bowerbird to reach maturity.
0:30:41 > 0:30:44In the meantime, they practise making a bower
0:30:44 > 0:30:46and dancing for each other.
0:30:48 > 0:30:52But they can never have too many blue trinkets and bling.
0:30:54 > 0:30:56Time to go out stealing again.
0:30:59 > 0:31:03And bowers don't come more decadently inviting than this.
0:31:05 > 0:31:07But this is no ordinary bower,
0:31:07 > 0:31:12it's occupied by a male spy bowerbird and adorned
0:31:12 > 0:31:16with an irresistible array of blue treasure and dual cameras,
0:31:16 > 0:31:20all perfectly placed to catch the thieves in the act.
0:31:30 > 0:31:34Like professionals, they approach with caution.
0:31:36 > 0:31:39Once again, they pretend to be courting females.
0:31:41 > 0:31:44This time they work together.
0:31:44 > 0:31:47One distracts as the other steals the jewels.
0:31:49 > 0:31:54Spy bowerbird can only observe as they clean out the bower,
0:31:54 > 0:31:55gem by precious gem.
0:32:03 > 0:32:06Back home with their stolen goods,
0:32:06 > 0:32:09they continue to practise their courtship techniques.
0:32:10 > 0:32:14But spy bowerbird isn't off the hook.
0:32:18 > 0:32:21The male bowerbird who was their first victim
0:32:21 > 0:32:23needs to replenish his bower.
0:32:24 > 0:32:28Well, if you can't beat them, you may as well join them.
0:32:37 > 0:32:41In Senegal, the art of seduction brings out the worst
0:32:41 > 0:32:43in our closest animal relatives.
0:32:51 > 0:32:55For young chimps, misbehaving is second nature.
0:32:58 > 0:33:03They're cut a lot of slack and generally do exactly what they want.
0:33:07 > 0:33:11But as they get older, they start to push their luck
0:33:11 > 0:33:12and wind the adults up.
0:33:21 > 0:33:24It starts small, but often escalates.
0:33:26 > 0:33:29Spy tortoise is just one of the many spy cameras
0:33:29 > 0:33:31that have been watching them.
0:33:37 > 0:33:40He's been capturing some very unconventional views.
0:33:49 > 0:33:53But now he's helping record how the bad behaviour of the youngsters
0:33:53 > 0:33:55translates into adulthood.
0:33:57 > 0:34:01In chimp society, there are always a few dominant males.
0:34:02 > 0:34:05As a young male reaches adulthood,
0:34:05 > 0:34:09he becomes a potential challenger for the top spot.
0:34:09 > 0:34:12The lead male must keep this cocky upstart in his place.
0:34:12 > 0:34:15SQUEALING
0:34:16 > 0:34:20And the other males are keen to teach him a lesson, too.
0:34:25 > 0:34:28He needs to get away or suffer serious injury.
0:34:33 > 0:34:36He may not be popular with the bigger guys...
0:34:39 > 0:34:42..but among the females, it's a different matter.
0:34:52 > 0:34:56It seems many prefer the younger male.
0:35:02 > 0:35:05She seems to be giving him the come-on,
0:35:05 > 0:35:07but he must be careful he isn't seen.
0:35:10 > 0:35:14Fortunately, chimps like their midday nap...
0:35:22 > 0:35:26..and the female encourages him to follow her.
0:35:41 > 0:35:43It could be his lucky day.
0:35:47 > 0:35:49One last check.
0:35:56 > 0:35:59Time for a little extra privacy.
0:36:04 > 0:36:07Unfortunately, one male has the perfect vantage point.
0:36:14 > 0:36:16Spotted!
0:36:17 > 0:36:20This is strictly against the rules.
0:36:22 > 0:36:24SQUEALING
0:36:32 > 0:36:35His fun ruined, he leaves in disgrace.
0:36:37 > 0:36:41But once he's cooled off, he'll be back.
0:36:45 > 0:36:47In the Kalahari Desert in South Africa,
0:36:47 > 0:36:52there are dire consequences for those who have illicit affairs.
0:36:56 > 0:36:59Meerkats live in large family groups
0:36:59 > 0:37:03and there is equality among most of the members.
0:37:06 > 0:37:09But with so many meerkats living together,
0:37:09 > 0:37:12clear leadership is needed to maintain authority.
0:37:14 > 0:37:16This female is in charge.
0:37:16 > 0:37:18Often called the queen,
0:37:18 > 0:37:22she is the only female to breed in the entire colony.
0:37:23 > 0:37:28Spy meerkat is ideally placed to film any rule breakers.
0:37:29 > 0:37:31Sentinels watch for danger
0:37:31 > 0:37:34so that the rest of the colony can socialise.
0:37:35 > 0:37:38Play helps youngsters practise fighting skills
0:37:38 > 0:37:40they'll need in the future
0:37:40 > 0:37:43and makes sure they're all supportive of the colony.
0:37:47 > 0:37:50The queen meerkat asserts her higher position
0:37:50 > 0:37:53by hip slamming and chin swiping.
0:37:59 > 0:38:02She doesn't want the youngsters to get ideas above their station.
0:38:06 > 0:38:10Constant reminders of who's boss help to maintain a stable society.
0:38:14 > 0:38:17But sometimes the balance of power is challenged.
0:38:20 > 0:38:22A roving male from outside the colony
0:38:22 > 0:38:24is on the lookout for a female...
0:38:26 > 0:38:30..one that has reached maturity and is up for some excitement.
0:38:31 > 0:38:35She sneaks off for an illicit encounter.
0:38:37 > 0:38:41Away from the group, she's free to express her desire.
0:38:51 > 0:38:56Her flirtations are strictly taboo - only the queen has breeding rights.
0:39:07 > 0:39:10But she's been caught in the act.
0:39:13 > 0:39:16The queen launches an attack.
0:39:18 > 0:39:22The rest of the group show their support.
0:39:26 > 0:39:30A female that tries to breed is a threat to the status quo.
0:39:33 > 0:39:36Rulebreakers are not to be tolerated.
0:39:40 > 0:39:43They must evict her from the colony.
0:39:56 > 0:39:58Resistance is pointless.
0:40:01 > 0:40:04But, alone, she's in great danger.
0:40:14 > 0:40:18And expelled to the edges of the colony, there is no easy way back.
0:40:23 > 0:40:27The nearest meerkats are hostile neighbours.
0:40:27 > 0:40:31Her indiscretion has put her life at risk.
0:40:41 > 0:40:43Off the coast of South Africa,
0:40:43 > 0:40:46more adolescents have reached that difficult age.
0:40:48 > 0:40:51At two years old, male bottlenose dolphins
0:40:51 > 0:40:54leave their mother's pod to form boisterous gangs
0:40:54 > 0:40:56looking for excitement.
0:40:56 > 0:40:58They like nothing better than surfing.
0:41:00 > 0:41:03Spy turtle is here to see what they get up to.
0:41:13 > 0:41:16He, in turn, is joined by another spy creature.
0:41:21 > 0:41:25This is spy puffer, based on a fish that blows itself into
0:41:25 > 0:41:27a defensive puffball.
0:41:30 > 0:41:34The spy creatures are here to film these teenage tearaways.
0:41:38 > 0:41:41Spy puffer faces a bumpy ride.
0:41:46 > 0:41:49Bust-ups are common.
0:41:52 > 0:41:55It's easy to get caught in the middle.
0:41:55 > 0:41:57SCREECHING
0:41:59 > 0:42:00The young males are so unruly
0:42:00 > 0:42:04the females kicked them out of the family pod.
0:42:08 > 0:42:10SCREECHING
0:42:21 > 0:42:24They even send spy turtle in a spin.
0:42:32 > 0:42:35This isn't spy puffer, it's a real pufferfish.
0:42:37 > 0:42:40The poor creature gets the same rough treatment.
0:42:51 > 0:42:53Perfect for a game of catch.
0:43:00 > 0:43:02But the dolphins are dicing with death.
0:43:05 > 0:43:10Pufferfish are one of the most poisonous fish in the ocean.
0:43:10 > 0:43:14They exude a powerful nerve poison called tetrodotoxin.
0:43:15 > 0:43:18It only takes a small amount to kill a human.
0:43:22 > 0:43:27Even so, the dolphins often look for pufferfish and love to chew on them.
0:43:29 > 0:43:31Taken in small doses,
0:43:31 > 0:43:34the secretions seem to have a narcotic effect.
0:43:45 > 0:43:48The dolphins are careful not to swallow them.
0:43:48 > 0:43:51Instead, they hold them gently in their mouths.
0:43:54 > 0:43:55Despite the risks,
0:43:55 > 0:43:58passing the puffer has become a popular dolphin pastime.
0:44:26 > 0:44:30Luckily, the little fishes usually survive the strange experience.
0:44:41 > 0:44:43But dolphins aren't the only creatures
0:44:43 > 0:44:45that seem to enjoy natural highs.
0:44:50 > 0:44:54In Madagascar, brown and black lemurs have an equally odd weakness
0:44:54 > 0:44:56for mind-altering chemicals.
0:45:03 > 0:45:06Their favourite poison is found crawling in the forest.
0:45:08 > 0:45:11Like pufferfish, millipedes are toxic.
0:45:13 > 0:45:17But that doesn't stop the lemurs seeking them out.
0:45:26 > 0:45:30The millipedes use dangerous secretions, including cyanide,
0:45:30 > 0:45:32as a defence.
0:45:36 > 0:45:40But the lemurs still chew on them, albeit extremely cautiously.
0:45:46 > 0:45:49The toxins cause the lemurs to salivate.
0:45:52 > 0:45:55They then rub both the saliva and the millipede into their fur.
0:45:57 > 0:46:01They use it as an insecticide to ward off insects,
0:46:01 > 0:46:03such as mosquitoes that carry malaria.
0:46:04 > 0:46:07But they are suspiciously enthusiastic
0:46:07 > 0:46:09about the whole process.
0:46:16 > 0:46:20It seems they don't just work as an insect repellent...
0:46:24 > 0:46:28..the chemicals also appear to send them into a trance-like state.
0:46:39 > 0:46:42A condition of complete intoxication.
0:46:59 > 0:47:01And they can't seem to get enough.
0:47:18 > 0:47:21When it's all over, there's no hiding the state they're in.
0:47:26 > 0:47:28Time to sleep it off.
0:47:38 > 0:47:43Back in the Kalahari Desert and spy meerkat is on the lookout
0:47:43 > 0:47:45for the evicted female.
0:47:49 > 0:47:51She's still all alone.
0:47:55 > 0:47:57Pushed to the edge of her territory,
0:47:57 > 0:48:00she's an easy target for the hostile neighbours.
0:48:04 > 0:48:07A bolthole offers refuge from the threat.
0:48:13 > 0:48:17These meerkats are hoping to steal some territory from her family,
0:48:17 > 0:48:20but she won't be able to fight them off by herself.
0:48:24 > 0:48:26The unruly mob try to dig their way in.
0:48:31 > 0:48:34They work as a team to shift as much sand as possible.
0:48:43 > 0:48:47Others leave their scent mark, laying claim to their new territory.
0:48:56 > 0:48:59She defends the bolthole with her life.
0:49:03 > 0:49:06But the marauding trespassers have been spotted.
0:49:09 > 0:49:11The group rally together.
0:49:19 > 0:49:23Tails held high, they perform an intimidating war dance.
0:49:40 > 0:49:43The rival gang clocks the incoming attack.
0:49:47 > 0:49:50It's designed as a show of strength and unity...
0:49:53 > 0:49:56..but the mob meets the attack head on.
0:50:00 > 0:50:02It's a fight for territory.
0:50:15 > 0:50:18But ultimately, the land grab fails.
0:50:23 > 0:50:25The female checks for the all clear.
0:50:32 > 0:50:35Her family drove the intruders away
0:50:35 > 0:50:37but she played her part.
0:50:38 > 0:50:41This is her opportunity to show her loyalty and subservience.
0:50:43 > 0:50:45She grooms the dominant female.
0:50:48 > 0:50:51The eviction was a harsh lesson in how to behave.
0:50:55 > 0:50:59Her apparent contrition does the trick -
0:50:59 > 0:51:01the queen meerkat accepts her back.
0:51:05 > 0:51:08But warfare doesn't just happen between groups -
0:51:08 > 0:51:11sometimes the battles begin at the heart of the family.
0:51:12 > 0:51:15The male chimpanzee that took his chance with a female
0:51:15 > 0:51:17is in a confident mood.
0:51:17 > 0:51:21He wants to flex his muscles within the troop.
0:51:22 > 0:51:25Spy bushbaby is watching to see what unfolds.
0:51:28 > 0:51:31The young male is pumped up and spoiling for a fight.
0:51:31 > 0:51:35Standing on two legs makes a more threatening display.
0:51:45 > 0:51:48SCREECHING
0:52:09 > 0:52:12To really act the tough guy, he needs a weapon.
0:52:19 > 0:52:23But this theatrical show has gone on long enough.
0:52:23 > 0:52:25The big males decide to take him on.
0:52:41 > 0:52:43The mothers gather up the youngsters.
0:52:43 > 0:52:45It's turning ugly.
0:53:05 > 0:53:07SCREECHING
0:53:12 > 0:53:15One dominant male makes his entrance.
0:53:18 > 0:53:21Time to put a stop to this outrageous behaviour.
0:53:23 > 0:53:26The two square up.
0:53:33 > 0:53:37But no-one does scary like the high-ranking male.
0:53:38 > 0:53:41SQUEALING
0:53:58 > 0:54:01Then he selects his own weapon and the conflict escalates.
0:54:19 > 0:54:20He means business -
0:54:20 > 0:54:23these stones are thrown with deadly accuracy.
0:54:29 > 0:54:31Time to make his escape.
0:54:39 > 0:54:43Defeated, the challenger vents his frustration.
0:54:47 > 0:54:52From the winner, a final show of his power.
0:54:53 > 0:54:58These may be raw emotions, but anger soon gives way to subtler feelings.
0:55:02 > 0:55:04A youngster reaches out a hand of friendship.
0:55:09 > 0:55:13Placed in the mouth, it's the ultimate show of trust.
0:55:14 > 0:55:16An act of faith and reassurance...
0:55:18 > 0:55:20..and a gesture the others mirror.
0:55:24 > 0:55:28Chimps may be quick to anger, but fun is never far away.
0:55:31 > 0:55:35For the little males, mischief is part of their psyche.
0:55:35 > 0:55:39It prepares them for family life in a rowdy troop
0:55:39 > 0:55:43where rules and consequences control their lives.
0:55:45 > 0:55:48For now, they can just enjoy their freedom.
0:55:52 > 0:55:55Spy bushbaby has revealed an eye-opening insight
0:55:55 > 0:55:57into chimp family politics...
0:55:59 > 0:56:02..and survived to spy another day.
0:56:03 > 0:56:05Wherever the spy creatures went,
0:56:05 > 0:56:09they gave unexpected insights into the intimate lives of animals.
0:56:13 > 0:56:17Emotions were explored when langurs grieved over a dropped spy monkey...
0:56:21 > 0:56:23..and a chimp adopted an abandoned kitten.
0:56:26 > 0:56:30Their extraordinary intelligence was revealed by an orang-utan
0:56:30 > 0:56:32who took to DIY...
0:56:34 > 0:56:38..and a bird who created a perfect fishing pole.
0:56:40 > 0:56:42Friendships were tested by spy cobra,
0:56:42 > 0:56:45who captured the solidarity of meerkat society.
0:56:47 > 0:56:51Spy croc filmed some tiny birds who formed a bond
0:56:51 > 0:56:53with the unlikeliest of neighbours.
0:56:56 > 0:57:00Finally, the spy creatures showed how bad behaviour
0:57:00 > 0:57:03is as much part of animals' lives as it is of our own.
0:57:09 > 0:57:13Maybe what they really revealed is that animals are more like us
0:57:13 > 0:57:16than we ever dared to believe.
0:57:18 > 0:57:21Next time, we reveal the cutting-edge technology
0:57:21 > 0:57:24and extraordinary science behind the series
0:57:24 > 0:57:26as it stretches the camera teams to their limits
0:57:26 > 0:57:30and tests some spy creatures to destruction.