0:00:02 > 0:00:05Australia - surfers, strange lingo...
0:00:05 > 0:00:06No worries, fair dinkum.
0:00:06 > 0:00:09..lots of sunshine and the bonza Barrier Reef.
0:00:09 > 0:00:12It's the biggest most spectacular coral reef in the world.
0:00:12 > 0:00:15What's more, every creature is linked to another.
0:00:15 > 0:00:19Just imagine one huge family tree dating back 18 million years.
0:00:19 > 0:00:23From the minuscule to the mammoth, to the miraculous,
0:00:23 > 0:00:25they're all connected in Barney's Barrier Reef.
0:00:46 > 0:00:49Oh, wow! I can hear the ocean.
0:00:49 > 0:00:52That's because you're IN the ocean.
0:00:53 > 0:00:54Oh, yeah.
0:00:54 > 0:00:57I, on the other hand, have a real sixth sense.
0:00:57 > 0:00:59I can really sense things around me.
0:00:59 > 0:01:01It's uncanny - check this out.
0:01:05 > 0:01:09I can sense, that today it's going to be sunny with a slight breeze.
0:01:09 > 0:01:12Oh, wow, your senses are spot-on.
0:01:12 > 0:01:17All right, I can sense there's a crab coming over that rock...now.
0:01:17 > 0:01:19It's coming...
0:01:20 > 0:01:23..it's obviously doing something more important.
0:01:23 > 0:01:25Oh, I can tell you that tonight...
0:01:25 > 0:01:28it's going to be a full moon.
0:01:28 > 0:01:30Sorry, that's next week.
0:01:30 > 0:01:34Wow. So, I guess I don't need to tell you there's a shark behind you.
0:01:34 > 0:01:36What?! Shark!
0:01:36 > 0:01:38Ha-ha! It's not a real shark.
0:01:38 > 0:01:41I guess, we've just proved that between us
0:01:41 > 0:01:42we don't have the greatest senses,
0:01:42 > 0:01:46but when it comes to these guys on the reef...
0:01:46 > 0:01:49they've got senses you haven't even heard of.
0:01:49 > 0:01:51They're sense-ational.
0:01:51 > 0:01:54You see what I did there, sense-ational.
0:02:00 > 0:02:02I smell a little fishy.
0:02:02 > 0:02:04I'm scared.
0:02:04 > 0:02:08Now, this is one big nostril and one amazing sense of smell.
0:02:08 > 0:02:10Meet the cunning cone shell.
0:02:10 > 0:02:12He pretends to be an innocent shell...
0:02:16 > 0:02:18but is constantly on the smell for dinner.
0:02:18 > 0:02:22As water passes through this tubey nostril of his,
0:02:22 > 0:02:26the cone shell is able to smell the aroma of nearby snoozing fish
0:02:26 > 0:02:29who suspect nothing until it's too late.
0:02:29 > 0:02:34I get it - the cone shell looks sweet and innocent,
0:02:34 > 0:02:36so who would suspect him of being a predator?
0:02:36 > 0:02:39The fish is at a bit of a disadvantage.
0:02:39 > 0:02:42The cone shell, with his extra long nostril can smell him,
0:02:42 > 0:02:44but he can't smell the cone shell.
0:02:44 > 0:02:45Yikes! Bye!
0:02:45 > 0:02:48Whoa! He's a fast worker.
0:02:48 > 0:02:50This is a multipurpose siphon,
0:02:50 > 0:02:54Hidden underneath is his tongue. On the end there's a tooth,
0:02:54 > 0:02:56but not any ordinary tooth,
0:02:56 > 0:02:58a barbed tooth that stabs its prey
0:02:58 > 0:02:59like a poisoned dart.
0:02:59 > 0:03:03The speed of attack together with his deadly venom
0:03:03 > 0:03:06mean that despite looking sweet and innocent...
0:03:06 > 0:03:07Can I help in any way?
0:03:07 > 0:03:10..he's actually a deadly, poisonous predator.
0:03:10 > 0:03:13A-ha, a deadly shell with super smell.
0:03:13 > 0:03:15Who smells so well, but you just can't tell.
0:03:17 > 0:03:21OK, enough of this bad poetry. Let's see our next sense-ability.
0:03:25 > 0:03:27Testing, testing -
0:03:27 > 0:03:31crayfish to mantas shrimp, do you read me, over and out?
0:03:31 > 0:03:32What?
0:03:32 > 0:03:35Those must be the biggest antennae in the world.
0:03:35 > 0:03:37In the sea world, definitely.
0:03:37 > 0:03:42Relatively speaking, they do have antennae as long as their bodies.
0:03:42 > 0:03:44But that's not the only weird thing about them.
0:03:44 > 0:03:47Listen to this for a strange set of parts -
0:03:47 > 0:03:49they have a body armour, eyes on stalks,
0:03:49 > 0:03:52six feet round the mouth, five pairs of legs
0:03:52 > 0:03:54and a fan on the bottom. What?
0:03:54 > 0:03:56Body armour, eyes on stalks,
0:03:56 > 0:03:59six feet by their mouths, five pairs of legs
0:03:59 > 0:04:01and a fan on the bum.
0:04:01 > 0:04:04Hello. That's amazing.
0:04:04 > 0:04:06That is one freaky body.
0:04:06 > 0:04:09Imagine if you had to walk around looking like that.
0:04:09 > 0:04:14And yet they kind of look OK, unlike me.
0:04:14 > 0:04:16Well, they have many talents.
0:04:16 > 0:04:19They use their antennae as legs, mostly to smell.
0:04:19 > 0:04:22When it comes to smelling they really are quite smell-sational.
0:04:22 > 0:04:24Give me a break.
0:04:24 > 0:04:25No-one asked you.
0:04:25 > 0:04:27You were saying.
0:04:27 > 0:04:29I think it's science time.
0:04:30 > 0:04:33OK, here's the science bit. Listen and learn.
0:04:33 > 0:04:37About 40 per cent of a crayfish's brain is devoted to smell
0:04:37 > 0:04:40compared to approximately one per cent of a human's.
0:04:40 > 0:04:42Oh, thanks Dr. B.
0:04:42 > 0:04:45They sense chemicals in the water, using these little leggy bits here.
0:04:45 > 0:04:48They're called antennules. Like diddy antennae.
0:04:48 > 0:04:51Yeah, kind of. They use their sensational smell
0:04:51 > 0:04:54mainly to find food, but it also comes in handy for...
0:04:54 > 0:04:57smelling the wee of other crayfish.
0:04:57 > 0:05:00Urgh! Yuck!
0:05:00 > 0:05:01Pardon?
0:05:01 > 0:05:06Yeah, when crayfish fight they wee into the water.
0:05:08 > 0:05:11What? That's so cool.
0:05:11 > 0:05:13Rather unusual weaponry I have to say.
0:05:14 > 0:05:18The smell of the wee tells the crayfish how strong his opponent is.
0:05:18 > 0:05:19It may even help him to decide
0:05:19 > 0:05:22whether to carry on fighting or back down.
0:05:22 > 0:05:24Crayfish are a feast of senses.
0:05:24 > 0:05:26They also hear through their legs.
0:05:26 > 0:05:30Their little hairy legs are able to sense water movements too.
0:05:30 > 0:05:34Oh, I can hear you. Oh, stop weeing.
0:05:34 > 0:05:38So, we've had one mega tube nostril and legs that can smell.
0:05:38 > 0:05:40Ocean sniffer animals are quite extreme.
0:05:40 > 0:05:44Just like our sniffing cone shell, our crafty crayfish
0:05:44 > 0:05:46has its very own strange way of smelling,
0:05:46 > 0:05:49not to mention strange things its smelling.
0:05:49 > 0:05:52But its about to get even weirder.
0:06:04 > 0:06:06This is fun.
0:06:06 > 0:06:10Peekaboo. Mine's better, I've got balloons.
0:06:10 > 0:06:12I give up, Sid. Where are you hiding?
0:06:12 > 0:06:14My mum got me a pink one.
0:06:15 > 0:06:19Now, show me someone who doesn't love a clownfish.
0:06:20 > 0:06:24Ah, look at them - clowning around.
0:06:24 > 0:06:28Hey, Gem, what did the shark say to his mate after eating a clownfish?
0:06:28 > 0:06:29Did that taste funny to you?
0:06:31 > 0:06:33They're so cute though.
0:06:33 > 0:06:36If you think that's cute, wait until you see this.
0:06:36 > 0:06:38It's a baby clownfish. Cool.
0:06:38 > 0:06:43Look - a titchy fish the size of a bean, but with a supersonic smell.
0:06:43 > 0:06:45Really. Oh, yeah, and boy do they need it.
0:06:45 > 0:06:49The mummy clownfish lays her eggs in the anemone,
0:06:49 > 0:06:51the home of the clownfish,
0:06:51 > 0:06:54but once they are born they drift away into the ocean.
0:06:54 > 0:06:56This isn't going to be sad story, is it?
0:07:00 > 0:07:02They may look cute, but they're tough.
0:07:02 > 0:07:04They're now on their own in the ocean
0:07:04 > 0:07:07and have to find another anemone to set up their own home.
0:07:07 > 0:07:10So, they're in the ocean, which is a pretty big place.
0:07:10 > 0:07:13How do they find an anemone, don't they get lost?
0:07:13 > 0:07:15That's where the anemone comes to the rescue.
0:07:15 > 0:07:17I'm over here, clowny.
0:07:17 > 0:07:19He releases a scent into the water,
0:07:19 > 0:07:22which the clownfish can sense from miles away.
0:07:22 > 0:07:26Strange. It's like me smelling Mum's cooking from the other end of town.
0:07:26 > 0:07:29It's believed that clownfish know which smell to follow,
0:07:29 > 0:07:33as they're covered in the mucus of the anemone they were born in.
0:07:33 > 0:07:37So, they wait until they get a whiff of something that smells like home.
0:07:37 > 0:07:39Then they follow their nose across the ocean
0:07:39 > 0:07:41to find their pal, the anemone,
0:07:41 > 0:07:43and nuzzle in for a fresh coat of mucus.
0:07:43 > 0:07:48Ah, home sweet home. We love you.
0:07:48 > 0:07:53Amazingly sensitive smelling skills. What does the anemone get out of it?
0:07:53 > 0:07:56This is a classic reef symbiotic friendship.
0:07:56 > 0:08:00It's an I'll scratch your back, you scratch mine, type of friendship.
0:08:00 > 0:08:05The bouncy clownfish help to scare other fish, like the butterfly fish.
0:08:05 > 0:08:06Boo. Go away.
0:08:08 > 0:08:11See, you never knew smell could be so handy, did you?
0:08:13 > 0:08:17Like our crazy crayfish who sniffs his opponent's wee in the water,
0:08:17 > 0:08:21the super sniffing clownfish and the anemone use scent in the ocean
0:08:21 > 0:08:23to communicate with each other.
0:08:23 > 0:08:24How sense-ational.
0:08:32 > 0:08:36Erm, shouldn't someone tell that fish that eating sand uphill
0:08:36 > 0:08:37is probably not a good idea?
0:08:37 > 0:08:40It's OK. This is a goatfish.
0:08:41 > 0:08:44They are not eating sand, but using their goatee whiskers
0:08:44 > 0:08:46to sift through the sand for bits of food.
0:08:46 > 0:08:49Goatfish - you're kidding, right?
0:08:49 > 0:08:53Kidding because baby goats are called kids. That's why it's funny.
0:08:55 > 0:08:57Oh, that's a cutey.
0:08:57 > 0:09:00As I was saying, they're called goatfish
0:09:00 > 0:09:04cos of these whiskery barbels under their chin, just like a goat's beard.
0:09:04 > 0:09:06Cool! It's like having your own mouth rake.
0:09:06 > 0:09:10But finding food in the sand is like looking for a needle in a haystack
0:09:10 > 0:09:12or, in this case, a shrimp in a sea bed.
0:09:12 > 0:09:16Ah, they're not just ordinary whiskers, they can actually taste,
0:09:16 > 0:09:17like whiskery tongues,
0:09:17 > 0:09:20so it may look like they're just rustling up a sandstorm,
0:09:20 > 0:09:23but they're actually noshing at the same time.
0:09:23 > 0:09:25He is constantly on the go, looking for food,
0:09:25 > 0:09:29which might explain why he has lots of fishy friends following him.
0:09:29 > 0:09:32Hi, goatie. What's up? Hey, follow that goatfish.
0:09:32 > 0:09:34Got any spare grub today, goatie?
0:09:34 > 0:09:39It might also explain why sometimes he just needs to be alone.
0:09:39 > 0:09:41Do you mind? I'm chilling, go away.
0:09:41 > 0:09:45So, what's the connection between the bearded goatfish and the clownfish?
0:09:45 > 0:09:48They both use taste and smell more than sight.
0:09:48 > 0:09:51The clownfish smelt the anemone from way out at sea
0:09:51 > 0:09:53and the goatfish can taste food hidden deep in the sand.
0:09:53 > 0:09:55Next up - sheepfish.
0:09:55 > 0:09:58No, I'm only kidding. No such thing as sheepfish.
0:09:58 > 0:10:00But this guy's just as cheerful.
0:10:00 > 0:10:04And he's got a very strange shaped body.
0:10:04 > 0:10:08Yes, meet the rather bizarre boxfish. Not difficult to see why.
0:10:08 > 0:10:11His body is square at the corners, so he looks like a box.
0:10:11 > 0:10:14Excuse me. Hey!
0:10:14 > 0:10:16He's not a very fast mover,
0:10:16 > 0:10:19I mean, his fins look a bit useless, if you ask me.
0:10:19 > 0:10:22Oh, he doesn't need bigger fins. Boxy here has got toxic skin
0:10:22 > 0:10:23and tastes disgusting.
0:10:26 > 0:10:29So, he gets left in peace to mosey round the reef at his own pace.
0:10:29 > 0:10:31But he looks too pretty to be toxic.
0:10:31 > 0:10:34That's another clue to his predators to leave him be.
0:10:34 > 0:10:38His bright outfit says, "I might look tasty, but eat me and weep."
0:10:38 > 0:10:43So, he's a mini-link to our goatfish with his tasty whiskers,
0:10:43 > 0:10:47one has an amazing sense of taste and one tastes amazingly bad.
0:10:47 > 0:10:50Does memory count as a sense? Because I'm losing mine.
0:10:50 > 0:10:53You're gonna have to remind me. OK, it's reef-cap time.
0:10:56 > 0:10:59Well, the cunning cone shell was our first super sensor.
0:10:59 > 0:11:02His extendable smelling tongue and innocent appearance
0:11:02 > 0:11:05means he can sneak up unseen on his unsuspecting dinner.
0:11:05 > 0:11:08As for the crayfish, I won't be paddling in crayfish waters
0:11:08 > 0:11:12any time soon. When they are fighting each other they speak with their wee.
0:11:12 > 0:11:13Eww!
0:11:13 > 0:11:15Ha! That's wee-ird.
0:11:15 > 0:11:18Your sense of humour needs some work.
0:11:18 > 0:11:20Get on with the reef-cap.
0:11:20 > 0:11:22You're just too sensible.
0:11:25 > 0:11:27Next - the cute clownfish with their super smell.
0:11:27 > 0:11:30Able to smell their anemone friends, kilometres away.
0:11:30 > 0:11:31For top taste buds,
0:11:31 > 0:11:34you can't beat the goatfish with his tasting whiskers.
0:11:34 > 0:11:36But no-one wants to taste our toxic boxfish.
0:11:36 > 0:11:39It's OK for him to stand out with his boxy body
0:11:39 > 0:11:41because he has yucky tasting skin.
0:11:41 > 0:11:44What a collection, although I sense our next sensors
0:11:44 > 0:11:46are going to be even more mind-boggling.
0:11:50 > 0:11:52Meet the cute little cleaner wrasse.
0:11:52 > 0:11:55As their name suggests, they spend their time cleaning up,
0:11:55 > 0:11:58nibbling nasties off the skin of fishes to stop them getting poorly.
0:11:58 > 0:12:03I like his little dance and I'm glad he's enjoying himself, but why?
0:12:03 > 0:12:04This is his way of saying,
0:12:04 > 0:12:07"I'm free. Hello, fishes. Anyone want a clean up?"
0:12:07 > 0:12:10Oh, he's a cleaner. Yeah. Where's his feather duster?
0:12:10 > 0:12:15They don't need it. All they need is their mouths and a big belly.
0:12:15 > 0:12:18They clean up the fish by eating all the nasty bits off them.
0:12:24 > 0:12:29Hang on a minute, that fish is massive and possibly quite hungry.
0:12:29 > 0:12:31Why doesn't he gulp up the cleaner wrasse?
0:12:31 > 0:12:34That's what happens to most fish in the reef.
0:12:34 > 0:12:36Well, the cleaner wrasse is super safe,
0:12:36 > 0:12:39even with fish that are partial to a wrasse or two for dinner.
0:12:39 > 0:12:41OK, confusion overload.
0:12:42 > 0:12:46Well, the cleaner wrasse know how to soothe the hungry fish
0:12:46 > 0:12:49by touching them with their fins as they clean.
0:12:49 > 0:12:52Very brave...but stupid.
0:12:52 > 0:12:54It's quite the opposite. The cleaner wrasse knows
0:12:54 > 0:12:57that if he starts massaging the bigger fish
0:12:57 > 0:13:01this will convince Mr Hungry Fish that he's doing a great job cleaning
0:13:01 > 0:13:03and that it's better not to eat him.
0:13:03 > 0:13:06OK, now I understand. It is a bit weird though, isn't it?
0:13:06 > 0:13:08Well, they know their clients well.
0:13:08 > 0:13:11Once the fish starts to enjoy the massage, he will stay around longer
0:13:11 > 0:13:14giving the cleaner wrasse more parasites to nibble.
0:13:14 > 0:13:16Oh, yes, more.
0:13:16 > 0:13:20The cleaner wrasse also seems to know when his clients are hungry
0:13:20 > 0:13:24and then he stays well away from their toothy chops. Get lost.
0:13:24 > 0:13:28And some fish visit the wrasse up to 150 times a day.
0:13:28 > 0:13:30Wow, that is a lot of massaging.
0:13:30 > 0:13:33Considering his size he's definitely a brave fish,
0:13:33 > 0:13:36but it doesn't look as though he works as hard as old man goatfish,
0:13:36 > 0:13:39who constantly rummages through the sand.
0:13:39 > 0:13:41So, just like our gregarious goatfish
0:13:41 > 0:13:44who feels his way to food with his whiskery feelers,
0:13:44 > 0:13:47the cleaner wrasse knows that tickling their fishy clients
0:13:47 > 0:13:49will ensure they get a fantastic feed.
0:13:58 > 0:14:03Why are shrimps always cleaning up? Come on, mate, get a life seriously.
0:14:03 > 0:14:07Don't have a go at the shrimp or you may have to deal with the scary goby.
0:14:07 > 0:14:10If you're not from the burrow, you're not coming in.
0:14:10 > 0:14:12Gobies are the shrimp bodyguards.
0:14:12 > 0:14:14They live together with the shrimp.
0:14:14 > 0:14:16While the shrimp tidies and builds the burrow,
0:14:16 > 0:14:18the gobies keep watch.
0:14:18 > 0:14:21Sid, keep an eye on that dodgy looking geezer over there, will you.
0:14:25 > 0:14:28They take their work very seriously, don't they?
0:14:28 > 0:14:30Oh, yeah, these gobies are not to be messed with.
0:14:30 > 0:14:35They are very protective over their mate shrimpy, here.
0:14:35 > 0:14:37Shrimpy, stay indoors. It's not safe.
0:14:37 > 0:14:39I'll just get rid of this rubble.
0:14:39 > 0:14:40The shrimp has poor eyesight,
0:14:40 > 0:14:45so relies on the goby to let him know when there might be danger lurking.
0:14:45 > 0:14:48Hang on a minute - I thought this show was about amazing senses.
0:14:48 > 0:14:50Even I can see under water...
0:14:54 > 0:14:57..well, a little bit. Whoa!
0:14:57 > 0:15:00The goby can't talk...
0:15:00 > 0:15:01and the shrimp can't see,
0:15:01 > 0:15:04so how does he know when to scarper?
0:15:04 > 0:15:07They are in constant contact with their shrimpy buddies.
0:15:07 > 0:15:10The shrimp keeps its antennae touching the body of the goby,
0:15:10 > 0:15:13who flicks the shrimp with its tail when it's alarmed.
0:15:13 > 0:15:17Then they both scarper into the burrow and they're as safe as houses.
0:15:17 > 0:15:19They are an unlikely pairing.
0:15:19 > 0:15:22Like all good friendships, I guess, opposites attract
0:15:22 > 0:15:25plus they both get lots of benefits from being buddies.
0:15:25 > 0:15:28The shrimp gets a warning of approaching danger
0:15:28 > 0:15:31and the goby gets a nice and very clean home to lay its eggs in.
0:15:31 > 0:15:35So, the shrimp and goby look out for each other by keeping in touch.
0:15:35 > 0:15:37Ah, how touching.
0:15:37 > 0:15:40And like our cleaner wrasse and his fishy clients,
0:15:40 > 0:15:43the shrimp and goby choose to stay in touch, by touch.
0:15:43 > 0:15:46So, who's our next sense-ation?
0:15:51 > 0:15:53Who are these dudes?
0:15:53 > 0:15:55You've got that right, Gem, they are dudes.
0:15:55 > 0:15:57Let me introduce the barracuda,
0:15:57 > 0:16:00hanging out together in their barracuda fish school.
0:16:00 > 0:16:02Yo, man, what's up.
0:16:02 > 0:16:06So, they're cool but not too cool for school. Not for fish school no.
0:16:06 > 0:16:09They hang out in school gangs and not much
0:16:09 > 0:16:14phases them with their sleekness and fangs. They think they're dudes.
0:16:14 > 0:16:18It's not so wise to tell them they are not the best lookers.
0:16:18 > 0:16:22Whatever. Why do they have a high opinion of themselves?
0:16:22 > 0:16:25They know that together they are quite fearsome
0:16:25 > 0:16:27and they stick together
0:16:27 > 0:16:31in their schools like this. Over to you Dr Barnacles.
0:16:31 > 0:16:34They have a lateral line down the side of their bodies,
0:16:34 > 0:16:37running from head to tail.
0:16:37 > 0:16:42The line consists of tiny hairs which sends information to the brain
0:16:42 > 0:16:44about changes in the water pressure.
0:16:44 > 0:16:49The hair-brained communication means they feel objects around them
0:16:49 > 0:16:51which explains why they can travel
0:16:51 > 0:16:55without bumping into rocks or each other.
0:16:55 > 0:17:00Oh, thanks, Dr Barnacles, oh, you are a clever chap. That's all right, Gem.
0:17:00 > 0:17:04I mean thank you, Gemma, lovely. Over to you Barney.
0:17:04 > 0:17:07Thanks, Dr Barnacles. On top of that they have good eyesight
0:17:07 > 0:17:12and can sprint swim up to 38 miles an hour. Now that is sense-ational.
0:17:12 > 0:17:16Like the shrimp who uses antenna to keep in touch,
0:17:16 > 0:17:19the barracuda also keep in touch remotely.
0:17:27 > 0:17:29Hey hello, Flipper.
0:17:29 > 0:17:31What's up, Barney?
0:17:31 > 0:17:33Dolphins are cool for many reasons.
0:17:33 > 0:17:37They swim brilliantly, are great divers but they also have amazing
0:17:37 > 0:17:39hearing, ten times better than us.
0:17:39 > 0:17:43What. I said, "Ten times better than us."
0:17:43 > 0:17:47Wow! Very funny. So why do they need to hear so well?
0:17:47 > 0:17:50It's hard to see long distances under water,
0:17:50 > 0:17:51so they need a way to find food,
0:17:51 > 0:17:55navigate and know where all their mates are.
0:17:55 > 0:17:58Don't tell me - I've worked it out.
0:17:58 > 0:18:00They wave their flippers. So one wave means,
0:18:00 > 0:18:03"Let's jump out of the water!" Two waves -
0:18:03 > 0:18:05that's like a dolphin high five.
0:18:05 > 0:18:10"Give me some fin. " Three waves is, "Like a cup of tea?" Four waves,
0:18:10 > 0:18:14"I could do with a biscuit to keep my energy up."
0:18:14 > 0:18:18Don't listen to him! Dolphins are lot more clever than that -
0:18:18 > 0:18:19they use echolocation.
0:18:19 > 0:18:21DOLPHIN "CHUCKLES"
0:18:21 > 0:18:27Pardon? I said, "Echolocation." I said, "Echolocation."
0:18:27 > 0:18:31As I was saying, echolocation is a device
0:18:31 > 0:18:35that lots of marine mammals use to find their way around.
0:18:35 > 0:18:39They send out sound waves or sonar clicks
0:18:39 > 0:18:44that are bounced back when the wave hits an object.
0:18:44 > 0:18:49Uh?! When the sound bounces, it returns to the dolphins with the info
0:18:49 > 0:18:52they need to know about their surroundings.
0:18:52 > 0:18:56They know what's lurking in the murky water and can sense
0:18:56 > 0:18:59its shape, size and speed. So a dolphin
0:18:59 > 0:19:03could detect a golf ball bouncing from a whole football field away.
0:19:03 > 0:19:07Cool, so that would be like us knowing there's a party going on
0:19:07 > 0:19:12on the island without hearing or seeing anything. A party here?!
0:19:12 > 0:19:14# Limbo, limbo. #
0:19:14 > 0:19:19As if. One thing I've always wondered though, how do they actually talk?
0:19:19 > 0:19:21It's thought that they talk
0:19:21 > 0:19:25by pushing air at high pressure through their nostrils.
0:19:25 > 0:19:27Cheerio.
0:19:27 > 0:19:31Like the barracuda the dolphins can sense each other
0:19:31 > 0:19:34from a distance. The barracudas via the lateral line
0:19:34 > 0:19:37on their sides and the dolphins through echolocation.
0:19:41 > 0:19:46Gem, you've got to be sense-ible. It's time for a reef-cap.
0:19:50 > 0:19:53The cleaner wrasse are crafty cleaners.
0:19:53 > 0:19:57By tickling clients they get to feed and stay alive.
0:19:57 > 0:20:01And talk about touching. There's nothing like this ocean friendship.
0:20:01 > 0:20:04While the shrimp cleans, the goby keeps watch
0:20:04 > 0:20:07for unwelcome guests and tells the shrimp
0:20:07 > 0:20:10when to return to the burrow. But our barmy barracuda
0:20:10 > 0:20:14have skin sensors so they can stick together in schools,
0:20:14 > 0:20:17so they are the coolest characters in the reef.
0:20:17 > 0:20:21Whatever. Cool maybe but not as cool as the delectable dolphins -
0:20:21 > 0:20:26aa aaa aaa-uh - with their super echolocating skills.
0:20:26 > 0:20:29Who's our next sense-ation?
0:20:31 > 0:20:34Oh, I just need to get up there.
0:20:34 > 0:20:36Go on, shrimpy, you can do it.
0:20:36 > 0:20:39There you go. Easy, these shrimps can do anything.
0:20:39 > 0:20:43Yeah, or nothing. He's asleep.
0:20:43 > 0:20:46Barney I think he's hurt his claw.
0:20:46 > 0:20:50Well spotted, he does have a giant claw but that's his party trick.
0:20:50 > 0:20:53Uh?
0:20:53 > 0:20:57What? It's supposed to be that size. Oh, yes, meet the snapping shrimp.
0:20:57 > 0:20:59He's so cute!
0:20:59 > 0:21:04Also known as the pistol shrimp. Ah, pleased to meet you, shrimpy.
0:21:04 > 0:21:06I'm scared.
0:21:06 > 0:21:09So what's with the giant claw? It's a prey stunner.
0:21:17 > 0:21:18Aaaargh!
0:21:18 > 0:21:22Barney! There had better be a good reason for doing that.
0:21:22 > 0:21:25I was demonstrating how the pistol shrimp uses its claw.
0:21:25 > 0:21:28Now for the science bit.
0:21:28 > 0:21:31To stun their prey, the shrimp snaps his claw shut
0:21:31 > 0:21:35forcing out water at 100 kilometres an hour.
0:21:35 > 0:21:39This forms a bubble which collapses very quickly causing a super loud
0:21:39 > 0:21:42popping sound like a huge underwater shock wave.
0:21:42 > 0:21:44What's for dinner?
0:21:44 > 0:21:45I'm scared.
0:21:45 > 0:21:50So he has this giant claw which he uses to send his prey into shock
0:21:50 > 0:21:54and then he can gobble them up easily? Wow! How quick was that?
0:21:54 > 0:21:56I'm sure the hermit crab
0:21:56 > 0:22:00jumped as much as I did within his little shell. Grrrr!
0:22:00 > 0:22:03CRAB WHIMPERS
0:22:03 > 0:22:05Oh, you're a wee man.
0:22:05 > 0:22:08The sounds he makes are louder than a real pistol
0:22:08 > 0:22:12and the bubble reaches the temperature of the Sun's surface.
0:22:12 > 0:22:17So, he's born with a massive right hook and instead of knocking
0:22:17 > 0:22:21his prey over the head with it, he uses it to snap out water. Why?
0:22:21 > 0:22:25His sensational shock waves work from a distance which means
0:22:25 > 0:22:29he doesn't even have to get close to his prey to kill it.
0:22:29 > 0:22:32Pretty crafty. Ah, and he looks so sweet and innocent.
0:22:32 > 0:22:37Like dolphins, the snapping shrimps get what they need using sound.
0:22:37 > 0:22:39The dolphins get their surroundings
0:22:39 > 0:22:42and the shrimps knock over their dinner.
0:22:49 > 0:22:52Well this geezer looks a bit..."saw".
0:22:52 > 0:22:56He's "saw" all right. This is the sawfish.
0:22:56 > 0:22:59Hello, dear.
0:22:59 > 0:23:02He has a snout like a vacuum cleaner, metal detector
0:23:02 > 0:23:06and spiky baseball bat all rolled into one.
0:23:06 > 0:23:10So with a snout like that he has to be a great sniffer, yeah?
0:23:10 > 0:23:13Ah, he does a lot more than smell.
0:23:13 > 0:23:17He has electro-sensory pores on the underside of his saw snout.
0:23:17 > 0:23:22These are able to pick up electrical fields from prey in the sand. Cool.
0:23:22 > 0:23:24Like a Jedi - a snout like a light sabre.
0:23:24 > 0:23:28His snout is by far his best accessory.
0:23:28 > 0:23:31He uses it to smell, taste, hear and touch his prey -
0:23:31 > 0:23:35who have no idea he has electro sensed them until it's too late.
0:23:35 > 0:23:38Hey!
0:23:38 > 0:23:41And, my grandma, what a big mouth he has.
0:23:41 > 0:23:44That's where the vacuum cleaner comes in.
0:23:44 > 0:23:48He can slash, shake or suck his victims up with his snout.
0:23:48 > 0:23:51It's all very well slashing, shaking and electro sensing
0:23:51 > 0:23:54but he can't fit his victim in his mouth!
0:23:54 > 0:23:58What a wally. Like the snapping shrimp the sawfish uses his senses
0:23:58 > 0:23:59to catch his dinner.
0:24:07 > 0:24:10Oh, wow, look, dancing grass!
0:24:10 > 0:24:13And sway to the left. And body-pop and dance...
0:24:13 > 0:24:17They like synchronised dancing and even body-popping.
0:24:19 > 0:24:22But it's not grass - this is the garden eel gang.
0:24:22 > 0:24:25But they look nothing like the moray eel.
0:24:25 > 0:24:27Yeah. Thank goodness!
0:24:27 > 0:24:28Where's he gone?
0:24:29 > 0:24:32Oh, there he is. Hello. Well, the garden eels
0:24:32 > 0:24:36are shyer than the moray eel and they don't have much in common.
0:24:36 > 0:24:39The moray eels have a super sense of smell,
0:24:39 > 0:24:41the garden eels have big eyes
0:24:41 > 0:24:45and amazing eyesight so they can see food and predators much better.
0:24:45 > 0:24:50Why do they scoot down at once? There's not that many predators.
0:24:50 > 0:24:52Yeah, they're a bit wimpy.
0:24:52 > 0:24:55If they sense danger, the whole lot of them go down.
0:24:55 > 0:24:57They copy each other.
0:24:57 > 0:25:01Quick something's coming. Eric, hurry up. Eric, you're always last.
0:25:01 > 0:25:03Do they ever split up
0:25:03 > 0:25:07or leave their holes? No, there's no place like a sandy burrow.
0:25:07 > 0:25:11They are covered in slime to slide in and out of their holes.
0:25:11 > 0:25:15So the garden eels have magnificent eyesight so what's the connection?
0:25:15 > 0:25:20Like our sawfish our garden eels use their super sense to find food.
0:25:24 > 0:25:26Hey, look, Gem, I'm a swordfish.
0:25:26 > 0:25:29It was a SAW-fish, Barney.
0:25:29 > 0:25:31I should have SAW that coming.
0:25:31 > 0:25:34I did a joke. It wasn't funny.
0:25:34 > 0:25:36OK, time for a reef-cap.
0:25:39 > 0:25:42First up was our cunning cone shell,
0:25:42 > 0:25:45with his siphon snout no chilling fish is safe.
0:25:45 > 0:25:48Who would a seashell to be a deadly poisonous predator.
0:25:48 > 0:25:51Who'd suspect crayfish of smelling through their legs
0:25:51 > 0:25:54and communicating through wee.
0:25:54 > 0:25:55I am very glad I can talk.
0:25:55 > 0:25:58For supersonic smell look no further than
0:25:58 > 0:26:03the teeny clownfish who follow their nose to their mate the anemone.
0:26:03 > 0:26:07What fish with whiskers on their chins like their namesakes.
0:26:07 > 0:26:11These greedy goatfish use their whiskers to find food.
0:26:11 > 0:26:12And an amazing sense of taste,
0:26:12 > 0:26:17unlike the ungainly boxfish who looks good but tastes amazingly bad.
0:26:17 > 0:26:21Sense-ational! Our cleaner wrasse know that the best way to feast
0:26:21 > 0:26:25on their clients is to tickle them, making sure
0:26:25 > 0:26:28they stay around allowing the wrasse to feed.
0:26:28 > 0:26:32For a touching twosome you can't beat the shrimp and his bodyguards
0:26:32 > 0:26:35who tell the shrimp when to go to the burrow.
0:26:35 > 0:26:37Our barracuda dudes rule the ocean
0:26:37 > 0:26:41in their supersensory schools keeping in touch by side sensors.
0:26:41 > 0:26:44A high five for our dolphins whose sonar senses
0:26:44 > 0:26:47mean they can communicate from miles away.
0:26:47 > 0:26:51And what about your snapping shrimp and mega claw that he uses
0:26:51 > 0:26:54to make a super loud pop?
0:26:54 > 0:26:57Nothing beats your very own electrical super snout...
0:26:57 > 0:26:59Hello, dear.
0:26:59 > 0:27:04..which the sawfish uses to see, hear, taste and smell prey. Hey.
0:27:04 > 0:27:08Good eyesight is cool if it lets you do synchronised swimming
0:27:08 > 0:27:11with your mates like our scaredy garden eels.
0:27:11 > 0:27:13Something's coming, get down.
0:27:17 > 0:27:21Ah... Gemma, I might be developing super senses of my own.
0:27:21 > 0:27:25I'm getting a real waft of chocolate cake. That smell
0:27:25 > 0:27:28must be coming from the mainland and I can smell it.
0:27:28 > 0:27:31That's amazing. Mm. Amazing.
0:27:37 > 0:27:39Subtitles by Red Bee Media Ltd.
0:27:39 > 0:27:42E-mail subtitling@bbc.co.uk