0:00:02 > 0:00:04Australia - home to cool surfer dudes, strange lingo...
0:00:04 > 0:00:06No worries, mate.
0:00:06 > 0:00:08..lots of sunshine and the bonzer Barrier Reef.
0:00:08 > 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 > 0:00:18Just imagine on huge family tree, dating back 18 million years.
0:00:18 > 0:00:21From the miniscule to the mammoth to the miraculous -
0:00:21 > 0:00:24they're all connected in Barney's Barrier Reef!
0:00:45 > 0:00:48There are many ways you can travel around the ocean.
0:00:48 > 0:00:51- And this is one of them. - Well, it's the easy way. Ha ha!
0:00:51 > 0:00:53There's the athletic way...
0:00:54 > 0:00:56Or there's the ambitious way.
0:00:59 > 0:01:01Really we're spoilt for choice.
0:01:01 > 0:01:05The ocean community don't have planes, trains or boats,
0:01:05 > 0:01:07but they still need to get around.
0:01:07 > 0:01:11Luckily they have a wealth of ways of wandering through the water.
0:01:11 > 0:01:14So how DO they get from A to B?
0:01:14 > 0:01:16Let's find out. Full steam ahead.
0:01:17 > 0:01:19Whoo-hoo!
0:01:22 > 0:01:25First up, a very mysterious mover.
0:01:29 > 0:01:31Wow! Is it a fish?
0:01:31 > 0:01:33Is it a turtle?
0:01:33 > 0:01:35Is it a whale? What is it?
0:01:35 > 0:01:38This, Barney, is a sunfish.
0:01:38 > 0:01:39Is it alive?
0:01:39 > 0:01:42It looks like someone forgot to finish you off!
0:01:42 > 0:01:44I know. He's a little weird looking.
0:01:44 > 0:01:46Notice anything missing?
0:01:46 > 0:01:47Yeah, most of his body.
0:01:47 > 0:01:51Something in particular that might make him swim slower?
0:01:51 > 0:01:53Well, he's lacking something on the back end.
0:01:53 > 0:01:55- Like half a body.- Yeah.
0:01:55 > 0:01:59The most distinguishing feature about the sunfish is what he doesn't have.
0:01:59 > 0:02:00He has no tail.
0:02:00 > 0:02:03That's why he looks like a fish head.
0:02:04 > 0:02:06So how does he get along, and why is he only half built?
0:02:06 > 0:02:09He uses fins to propel himself forward.
0:02:09 > 0:02:12No-one really knows why he has no tail.
0:02:12 > 0:02:16They think parts of the dorsal and anal fins were extended
0:02:16 > 0:02:19and then joined together again to replace the tail fin.
0:02:19 > 0:02:21That stumpy bit waving at the back
0:02:21 > 0:02:25is not a proper tail but a kind of pretend tail.
0:02:25 > 0:02:26I bet he's gutted.
0:02:26 > 0:02:29I doubt it. He's a big presence in the reef -
0:02:29 > 0:02:32they can grow up to one-and-a-half tons in weight.
0:02:32 > 0:02:34So he knows his place all right.
0:02:36 > 0:02:40One-and-a-half tons. That's like twenty Barneys.
0:02:40 > 0:02:42No wonder he doesn't miss his tail.
0:02:42 > 0:02:45It would take 16 men to lift this big boy.
0:02:45 > 0:02:47Or 26 Barneys.
0:02:47 > 0:02:49- Are you saying I'm below average? - As if!
0:02:49 > 0:02:52He's not the life and soul of the party, is he?
0:02:52 > 0:02:56Maybe not. But he's found an ingenious way of moving around.
0:02:56 > 0:02:58You try swimming without a tail!
0:02:58 > 0:03:00OK, keep your hair on...
0:03:00 > 0:03:02I guess he does qualify as an ocean mover.
0:03:02 > 0:03:03Well, just.
0:03:12 > 0:03:14Ah! It looks like a domino.
0:03:14 > 0:03:19- I know. They're pretty, aren't they? They're called triggerfish.- OK.
0:03:19 > 0:03:21Tell me more, triggerfish expert.
0:03:21 > 0:03:23The triggerfish does have a tail.
0:03:23 > 0:03:26But like the sunfish, it's abandoned using it.
0:03:26 > 0:03:28Instead, it uses its top and bottom fins.
0:03:28 > 0:03:31The reason these guys are more agile than the sunfish
0:03:31 > 0:03:33is because they have side fins
0:03:33 > 0:03:36that help them move around obstacles, like corals.
0:03:36 > 0:03:38In other words, a great steering system.
0:03:42 > 0:03:44They look like they're sideways swimming.
0:03:44 > 0:03:47It's a bit like a bird flying on its side.
0:03:47 > 0:03:51Why do they use their top and bottom fins more than their other fins?
0:03:51 > 0:03:52They need to move around quickly.
0:03:52 > 0:03:55This is a more energy efficient way of swimming.
0:03:55 > 0:03:58OK. So in other words, they're lazy?
0:03:58 > 0:04:01No way. The have to swim all day, remember.
0:04:01 > 0:04:04This method means they don't get tired as easily. Try it, it works!
0:04:04 > 0:04:07So why do front crawl when you can mosey along on your side?
0:04:08 > 0:04:10Well, it works for me.
0:04:11 > 0:04:13Just like the sunfish who has no real tail,
0:04:13 > 0:04:16our triggerfish doesn't use his tail much, either.
0:04:16 > 0:04:19He's figured out that sideways swimming is the way forward.
0:04:19 > 0:04:22OK, so we've had two tailless travellers
0:04:22 > 0:04:25who use nifty ways of getting from A to B.
0:04:25 > 0:04:28So, who's our next magnificent mover?
0:04:31 > 0:04:34Look at him. He's not an animal, he's a flying carpet.
0:04:34 > 0:04:37Yeah, he's quite a nifty mover, this one.
0:04:37 > 0:04:38This is a flatworm.
0:04:38 > 0:04:39A flatworm.
0:04:39 > 0:04:42He's been short-changed on the name front.
0:04:42 > 0:04:44He's not that flat and looks nothing like a worm.
0:04:44 > 0:04:47And it doesn't describe what a good mover he is.
0:04:47 > 0:04:49He should be called "the rippling worm".
0:04:49 > 0:04:51Or rather, "the rippling carpet".
0:04:51 > 0:04:54I agree. This is a pretty speedy way of moving.
0:04:54 > 0:04:58It's because he uses his whole body to move around.
0:04:58 > 0:05:01The flexible flatworm, I like it.
0:05:01 > 0:05:02But what's the hurry?
0:05:02 > 0:05:04They live on the ground most of the time,
0:05:04 > 0:05:08but sometimes they find themselves swept up by a super-strong current
0:05:08 > 0:05:10or chased by a bossy fish.
0:05:10 > 0:05:13That's why they came up with the speedy swimming technique.
0:05:13 > 0:05:15Does he ever stop?
0:05:15 > 0:05:17He goes on and on and on, this one.
0:05:18 > 0:05:22- Phew, I'm exhausted!- Me too.
0:05:22 > 0:05:24But I think I see the connection.
0:05:24 > 0:05:28Both the triggerfish and the flatworm use a rippling motion to get around.
0:05:28 > 0:05:30The flatworm ripples its body
0:05:30 > 0:05:32and the triggerfish ripples its fins.
0:05:32 > 0:05:36These two are connected because they both go for a cool ripple effect.
0:05:39 > 0:05:43SPANISH GUITAR PLAYS
0:05:43 > 0:05:44Hola, mis chicos.
0:05:44 > 0:05:48Yo soy un pink fishy. Mi nombre es dancer Espanol.
0:05:48 > 0:05:51- Are you OK?- You like my Spanish accent?- Mm-hm...
0:05:51 > 0:05:55OK, I'd like to introduce my next nifty mover, the Spanish dancer.
0:05:55 > 0:05:59Spanish dancer? I can't see any dancing or anything Spanish.
0:05:59 > 0:06:01Aw, pretty in pink, though.
0:06:01 > 0:06:03Ole!
0:06:12 > 0:06:14This is a species of nudibranch.
0:06:14 > 0:06:17named after the Flamenco dress of Spanish dancers.
0:06:17 > 0:06:20I can kind of see that, but really,
0:06:20 > 0:06:23I'm not sure you can call THAT Spanish dancing.
0:06:23 > 0:06:27No. Instead of nifty dancing feet, they have one big clumsy foot
0:06:27 > 0:06:30underneath their dress which slides them along the reef.
0:06:30 > 0:06:33They're quite cool. They can grow up to 50cm,
0:06:33 > 0:06:35which is the size of a small poodle.
0:06:37 > 0:06:40That's one big dress, all right.
0:06:40 > 0:06:42OK, they do move but I wouldn't say
0:06:42 > 0:06:45this is a great mode of water transport.
0:06:45 > 0:06:47Sliding and the odd flip and bend.
0:06:47 > 0:06:50- SPANISH ACCENT:- That is where you are wrong, Senorita.
0:06:50 > 0:06:51- Drop the accent.- Sorry.
0:06:51 > 0:06:54Let me introduce you to the Spanish dancer's nifty moves.
0:06:55 > 0:06:57And move that body and bend,
0:06:57 > 0:06:59and bend, and work that body...
0:06:59 > 0:07:02Woah, looks like hard work.
0:07:02 > 0:07:04See, now you know why he needs to chill sometimes.
0:07:04 > 0:07:07And he swims a bit like the flatworm.
0:07:07 > 0:07:09He does indeed.
0:07:09 > 0:07:12Senor Spanish dancer uses his whole body to move through the ocean.
0:07:12 > 0:07:15Which connects him to the floaty flatworm.
0:07:18 > 0:07:21And while we're visiting our Spanish dancer,
0:07:21 > 0:07:23I'd like to introduce you to our next crafty carrier.
0:07:23 > 0:07:25See the little pink shrimp?
0:07:25 > 0:07:27Oh yeah, bless.
0:07:27 > 0:07:30He is an imperial shrimp and this is an example of
0:07:30 > 0:07:32"you scratch my back and I'll scratch yours."
0:07:32 > 0:07:35In this case it's the shrimp doing most of the scratching.
0:07:35 > 0:07:38Oh yeah. Left a bit.
0:07:38 > 0:07:39Down a little bit.
0:07:39 > 0:07:40That's it. Good.
0:07:41 > 0:07:43And hitching, by the looks of it.
0:07:43 > 0:07:47Yeah, they get a good deal from our friend, the Spanish dancer.
0:07:47 > 0:07:49They nibble, poke around and have a free ride.
0:07:49 > 0:07:52They're very nicely coordinated.
0:07:52 > 0:07:56They are. They're the same colour as their bus - or nudibranch -
0:07:56 > 0:07:59handy, because they are completely camouflaged.
0:07:59 > 0:08:02This, together with the fact that the Spanish dancer looks tasty
0:08:02 > 0:08:03but tastes foul, puts off predators.
0:08:05 > 0:08:09This means shrimpy can chill out, eat and travel, knowing he's safe.
0:08:09 > 0:08:11A bit like travelling first class.
0:08:11 > 0:08:12With a bodyguard.
0:08:12 > 0:08:15So, our pretty-in-pink shrimp
0:08:15 > 0:08:18and our glamorous Spanish dancer are always together.
0:08:18 > 0:08:20Can't get more closely connected than this.
0:08:20 > 0:08:23They are constant travelling buddies.
0:08:23 > 0:08:25Who else is connected to the Spanish dancer?
0:08:28 > 0:08:30Snails...
0:08:30 > 0:08:32Get a move on, we haven't got all morning.
0:08:32 > 0:08:34Give them a chance.
0:08:34 > 0:08:36Just because they don't have a pink frilly coat
0:08:36 > 0:08:38like the Spanish dancer...
0:08:40 > 0:08:42..doesn't mean they don't have a nifty way of moving.
0:08:42 > 0:08:46Pull the other one. They're SO slow.
0:08:46 > 0:08:48So? They still move, don't they?
0:08:48 > 0:08:50And, only using one foot.
0:08:50 > 0:08:53This one's better. He looks like an army tank.
0:08:53 > 0:08:55But I wouldn't put money on him winning a battle.
0:08:55 > 0:08:57This one's a giant triton shell.
0:08:57 > 0:09:00- GRUFFLY:- Ooh, a giant triton shell.
0:09:05 > 0:09:09Sounds like something off Gladiators. But it's just a snail.
0:09:09 > 0:09:12You may mock but they can grow as big as a small dog.
0:09:12 > 0:09:14Well, whoop-de-doo.
0:09:14 > 0:09:17It doesn't matter how many different ones you show me,
0:09:17 > 0:09:18they're still too slow!
0:09:18 > 0:09:21They don't have to move quickly. They feed on sea stars
0:09:21 > 0:09:24who are also slow movers and sandy dwellers,
0:09:24 > 0:09:26so they don't have to look far for dinner.
0:09:26 > 0:09:30They always have their shell to retreat into, so why bother rushing?
0:09:30 > 0:09:32Because it's like watching paint dry.
0:09:32 > 0:09:35They can also dig under the sand to find food.
0:09:35 > 0:09:37Erm, what are you doing?
0:09:37 > 0:09:40You know, just catching up on some e-mails.
0:09:40 > 0:09:42Or should I say, "e-snails"?
0:09:42 > 0:09:44It's quite a slow connection.
0:09:44 > 0:09:47Yeah. Just till the snails get here.
0:09:47 > 0:09:50OK, OK. Get the message.
0:09:50 > 0:09:51Send.
0:09:53 > 0:09:55The sea snail links the Spanish dancer
0:09:55 > 0:09:58- through their ability to move... - Badly...- ..on one foot.
0:09:59 > 0:10:02You'll have to wait for my next magnificent mover
0:10:02 > 0:10:04while we catch up on our connections so far.
0:10:09 > 0:10:13How did we get from the tailless sunfish to the sleepy snail?
0:10:13 > 0:10:16We started with our stately sunfish who, with no tail,
0:10:16 > 0:10:19has to use his half-finished fins to transport him around.
0:10:19 > 0:10:23Our triggerfish saves his energy by a bit of sideways swimming.
0:10:23 > 0:10:26It's cool, but not as cool as the fabulous flatworm.
0:10:26 > 0:10:28Rubbish name, sensational swimming technique.
0:10:28 > 0:10:32But for a true workout he can't beat our Spanish dancer.
0:10:32 > 0:10:35Who can't dance, but boy, can they swim!
0:10:35 > 0:10:38They use their whole body for a proper aerobic workout.
0:10:40 > 0:10:42Unlike the lazy shrimp, who's just along for the ride.
0:10:42 > 0:10:46Then there's the... Excuse me.
0:10:46 > 0:10:47The sleepy snails,
0:10:47 > 0:10:48who move around on one foot.
0:10:48 > 0:10:51It takes them all night to cross the ocean floor.
0:10:51 > 0:10:55So, we've had sensational swimming, we've had bus-riding shrimps,
0:10:55 > 0:10:57and we've had flouncy flatworms.
0:10:57 > 0:10:59How else do our fishy friends get from A to B?
0:11:04 > 0:11:06Hello, handsome.
0:11:08 > 0:11:10Now, one guess why he's called a frogfish.
0:11:10 > 0:11:13He looks like a frog and hops like a frog?
0:11:13 > 0:11:15But not nearly as effectively.
0:11:16 > 0:11:21They weren't first in the queue when swimming techniques were handed out.
0:11:21 > 0:11:23They have to use their modified fins as legs.
0:11:23 > 0:11:26- It's their only way of moving. - Well, he's a real bumbler.
0:11:26 > 0:11:29It's impressive for a fish to be able to walk.
0:11:29 > 0:11:31Especially one that looks like a frog.
0:11:31 > 0:11:34Though I still don't understand why he can't swim off.
0:11:34 > 0:11:38Unlike most fish, frog-face here doesn't have a swim bladder.
0:11:38 > 0:11:41That's the thing that helps fish to stay afloat.
0:11:41 > 0:11:45It's a bit like a rubber ring. So they have to stay at the bottom.
0:11:46 > 0:11:48Where's he going? Hey, come back!
0:11:48 > 0:11:51It also means they can get blown away by the current,
0:11:51 > 0:11:54if their fins aren't able to stabilise them.
0:11:54 > 0:11:58So actually, the fact he can jump at all is pretty cool.
0:11:58 > 0:12:00He's a determined little geezer, all right.
0:12:00 > 0:12:03Jumping for him is like us jumping from the bottom of the pool
0:12:03 > 0:12:05with weights tied round our ankles.
0:12:05 > 0:12:08I won't be volunteering for that experiment.
0:12:08 > 0:12:10Aw, he can't move very well
0:12:10 > 0:12:13but at least he's too ugly for anything to want to eat him.
0:12:13 > 0:12:17Well, someone would eat him. Nothing goes to waste in the ocean.
0:12:17 > 0:12:19That's why hairy Mary is hiding in the weed
0:12:19 > 0:12:22and these orange ones look like sea sponges.
0:12:22 > 0:12:23BURP!
0:12:23 > 0:12:28Well, I guess frogfish are a bit cooler than my snails.
0:12:28 > 0:12:32So our ugly, clumsy but brave frogfish
0:12:32 > 0:12:34uses his fins to walk along the ocean floor.
0:12:34 > 0:12:36Which links in to our slow-walking snail.
0:12:36 > 0:12:38Who's our next ocean mover?
0:12:44 > 0:12:46Introducing the epaulette shark.
0:12:46 > 0:12:48Ah, spotty shark. That's a new one.
0:12:48 > 0:12:50He's a bottom-dwelling shark.
0:12:50 > 0:12:53He needs different markings so he can hang out at the bottom unseen.
0:12:53 > 0:12:56He's not as scary-looking as other sharks.
0:12:56 > 0:12:58In fact, he looks quite comical.
0:12:58 > 0:13:00He's very different from your average shark.
0:13:00 > 0:13:02He loves shallow water.
0:13:02 > 0:13:04Hang on a minute, is he walking?
0:13:04 > 0:13:07Yep. Those fins are made for walking.
0:13:07 > 0:13:08It's weird, isn't it?
0:13:08 > 0:13:11A little. So he's just strolling in the shallows.
0:13:11 > 0:13:14He can swim but because he loves the ground so much,
0:13:14 > 0:13:17he's adapted his fins to allow him to walk across.
0:13:17 > 0:13:20When it's low tide they don't have a lot of water to swim in.
0:13:20 > 0:13:22They can trot along from pool to pool.
0:13:22 > 0:13:25And they can have a good rummage for any food.
0:13:25 > 0:13:29As they're strolling, they can stop, have a nibble and carry on.
0:13:30 > 0:13:33He's another one who's got fins built for walking,
0:13:33 > 0:13:35just like the frogfish.
0:13:35 > 0:13:38It's another great way of getting from A to B in the Barrier Reef.
0:13:38 > 0:13:40And they're linked to the frogfish
0:13:40 > 0:13:43because they prefer the pedestrian way.
0:13:43 > 0:13:44Next up...
0:13:47 > 0:13:49We can't talk about travelling
0:13:49 > 0:13:52without talking about the ultimate long-distance traveller.
0:13:52 > 0:13:54This is another shark altogether.
0:13:54 > 0:13:56JAWS THEME TUNE
0:13:56 > 0:14:00Are we talking about the "classic" shark?
0:14:00 > 0:14:04Do you mean the shark that legends, films and all scary seas are made of?
0:14:04 > 0:14:06Absolutely.
0:14:07 > 0:14:10These guys are the long-distance lorry drivers of the ocean.
0:14:10 > 0:14:14They keep on swimming and swimming and swimming...
0:14:14 > 0:14:15morning, noon and night.
0:14:15 > 0:14:18They must stop to eat or take a nap.
0:14:18 > 0:14:20SNORING
0:14:20 > 0:14:23Some do, but our classic shark doesn't.
0:14:23 > 0:14:25Or rather, can't.
0:14:25 > 0:14:27Why not? Even lorry drivers get a tea break.
0:14:27 > 0:14:29Well, sharks don't have a swim bladder.
0:14:29 > 0:14:33That's what most sea life have to allow them to float without sinking.
0:14:33 > 0:14:35So why don't they sink?
0:14:35 > 0:14:38They've got a few handy devices to help them swim.
0:14:38 > 0:14:39Their shape, for one.
0:14:39 > 0:14:40It's a bit like a plane.
0:14:40 > 0:14:43It's designed to lift up as it moves forward.
0:14:43 > 0:14:45It's streamlined but they have several cool devices
0:14:45 > 0:14:47to help them in their superior swimming.
0:14:49 > 0:14:51They're pretty fast, for a start.
0:14:51 > 0:14:53That's because of their skin.
0:14:53 > 0:14:55It's made of interlaced scales
0:14:55 > 0:14:57that allow the water to pass over quickly,
0:14:57 > 0:14:59meaning they can move smoother and faster.
0:15:03 > 0:15:07But even better is their oil-filled liver.
0:15:07 > 0:15:10Oil-filled liver?! How does that help them swim faster?
0:15:10 > 0:15:13Calling Dr Barnacles.
0:15:14 > 0:15:18OK, here's the science bit - listen and learn.
0:15:18 > 0:15:22Now, oil is lighter than water, so it stops the shark sinking
0:15:22 > 0:15:24which means they can spend more energy swimming
0:15:24 > 0:15:26and less energy floating.
0:15:26 > 0:15:29And those two elements, combined with their super-light skeleton,
0:15:29 > 0:15:32means these super sharks zoom through the water.
0:15:32 > 0:15:37This, of course, doesn't apply to plastic sharks.
0:15:37 > 0:15:41You see, there's nothing like the classic shark's stamina, looks,
0:15:41 > 0:15:44and super-powered skin. They've got everything.
0:15:44 > 0:15:47But what happens when it's dinnertime?
0:15:47 > 0:15:50They just nosh on the move. It's the ultimate ocean drive-thru.
0:15:50 > 0:15:53So, unlike our epaulette, who can stop
0:15:53 > 0:15:56because he's on the ocean bottom and doesn't need to swim as much,
0:15:56 > 0:15:59these other sharks just can't stop swimming
0:15:59 > 0:16:01so are constantly on the go from A to B.
0:16:01 > 0:16:04Got it. So, we've had long-distance, walking sharks and fish,
0:16:04 > 0:16:06and one-foot crawlers.
0:16:09 > 0:16:13Who else connects back to our epaulette shark? Marathon runners.
0:16:13 > 0:16:18Well, funny you should say that? What would you do if you had eight legs?
0:16:18 > 0:16:20Is this the start of one of your bad jokes?
0:16:20 > 0:16:22No! Seriously, what would you do?
0:16:22 > 0:16:24OK, well, I'd take them out for a bit of a stroll
0:16:24 > 0:16:27and then I'd enter a running competition.
0:16:27 > 0:16:31- Really?- Yep.- See, great minds think alike. Just like our octopus.
0:16:31 > 0:16:34UPTEMPO PIANO MUSIC
0:16:38 > 0:16:43- Er, I don't think you can compare me to an octopus!- It's a compliment!
0:16:43 > 0:16:45They're really intelligent.
0:16:46 > 0:16:49DRAMATIC ORGAN MUSIC
0:16:49 > 0:16:52Like you said, what's the point of having eight arms and legs
0:16:52 > 0:16:55- if you don't make the most of them? - Do you think he's got a spare one?
0:16:55 > 0:16:57He needs them all. They don't have any skeleton
0:16:57 > 0:17:01- so their arms are just muscle. - That's why he's so flexible!
0:17:01 > 0:17:04Their suckers work like those rubber bathroom mats
0:17:04 > 0:17:07and allow them to cling on for dear life if they fancy a breather.
0:17:07 > 0:17:10He does spend a lot of time on the bottom, doesn't he?
0:17:10 > 0:17:13A bit like our epaulette shark who prefers to walk, rather than swim.
0:17:13 > 0:17:17That's the connection between our flexible octopus and epaulette shark.
0:17:17 > 0:17:20They both find walking a lot less effort than swimming.
0:17:22 > 0:17:24Aaah! Pretty coral!
0:17:26 > 0:17:28Yeah, yeah, but where's all the action?
0:17:28 > 0:17:31After the octopus, I want to see some proper movement.
0:17:31 > 0:17:35Patience, Barney. See that spindly thing there?
0:17:35 > 0:17:37FUNKY ELECTRONIC MUSIC
0:17:41 > 0:17:44There are loads of spindly things, this is like spindly reef.
0:17:44 > 0:17:49Well, that particular spindly thing, that...is a feather star.
0:17:49 > 0:17:54And that feather star is not doing any moving as far as I can see.
0:17:54 > 0:17:56In fact, he's clinging onto that reef for dear life.
0:17:56 > 0:17:59Well, he's only got spindly little legs.
0:17:59 > 0:18:02- Or feathery little legs, more like. - I think they're cute.
0:18:02 > 0:18:04Look! They come in different colours.
0:18:04 > 0:18:08The yellow one's slightly better but really, I'm not that impressed.
0:18:08 > 0:18:11Well, OK, look at this then.
0:18:11 > 0:18:14Have you ever seen a swimming technique like this one?
0:18:14 > 0:18:17It's no wonder they cling on! That's not swimming!
0:18:17 > 0:18:20That's flailing arms in all directions and hoping for the best.
0:18:20 > 0:18:23- Does he know how ridiculous he looks?- Probably not,
0:18:23 > 0:18:27but cool points go out of the window when you're trying to survive.
0:18:27 > 0:18:30So they use their many arms to swim back to safety.
0:18:30 > 0:18:34This might perk you up a bit - they have their mouth in their centre
0:18:34 > 0:18:38and their, er, bottom is located next to their mouth.
0:18:39 > 0:18:44Ah-ha - now that is weird! I didn't think there could be anything
0:18:44 > 0:18:46with more arms than a sprinty octopus.
0:18:46 > 0:18:49So our feather star is linked to the sprinting octopus
0:18:49 > 0:18:52because they both have loads of arms to help them move around.
0:18:52 > 0:18:56OK, time for a reef-cap.
0:19:00 > 0:19:03Our ocean movers haven't missed a single trick
0:19:03 > 0:19:05when it comes to getting from A to B.
0:19:05 > 0:19:08And these frog-feet might be made for walking OK
0:19:08 > 0:19:12but not always in a straight line when it comes to the frogfish.
0:19:12 > 0:19:16But a walking shark? That's a new one on me.
0:19:16 > 0:19:20Our epaulette shark is linked to Mr Froggy by their walking action.
0:19:20 > 0:19:23Unlike the classic shark, who has to travel very long distances
0:19:23 > 0:19:27- cos he has to keep moving. Doesn't stop for a cup of tea.- Poor him!
0:19:27 > 0:19:31And the running octopus with eight arms to scurry across the sea bed?
0:19:31 > 0:19:34Who's connected to the feather star with his funky arm moves.
0:19:34 > 0:19:39He won't win awards for swimming but he knows how to get from A to B!
0:19:45 > 0:19:48Now, imagine for a second you had no brain.
0:19:48 > 0:19:50OK, where are you going with this exactly?
0:19:50 > 0:19:54OK, bear with me. If you had no brain, you wouldn't be able to walk,
0:19:54 > 0:19:56talk, eat or do anything really.
0:19:56 > 0:19:58OK, Dr Gemma, I'm with you so far.
0:19:58 > 0:20:02Well, I just think our next ocean mover's really inspiring! Ta-dah!
0:20:06 > 0:20:10Inspiring? These are just sea stars, Gem.
0:20:10 > 0:20:12I'm wondering what's happened to your brain.
0:20:12 > 0:20:17Nothing wrong with my brain. These guys literally have no brain.
0:20:17 > 0:20:20But they can walk with five arms all at once.
0:20:20 > 0:20:22Are you sure they're walking?
0:20:22 > 0:20:24Oh yes, and not only that, they are coordinating
0:20:24 > 0:20:26all their five arms at the same time,
0:20:26 > 0:20:29together with many mini feet underneath the arms.
0:20:29 > 0:20:31Come on, they must have a brain.
0:20:31 > 0:20:34No, it's one of the mysteries of the ocean.
0:20:34 > 0:20:35It's baffled scientists
0:20:35 > 0:20:39- for decades.- That explains why they move so slowly.
0:20:39 > 0:20:43- It's a lot to think about all at once.- Ooh yeah, and they smell
0:20:43 > 0:20:44with their feet while they're moving!
0:20:44 > 0:20:46BARNEY SNIGGERS
0:20:46 > 0:20:51So they have smelly feet, feet that smell...smelly feet! Get it?
0:20:51 > 0:20:53Huh?
0:20:54 > 0:20:56Do they have one arm that does most of the work?
0:20:56 > 0:20:59- You know, like being right-handed or left-handed?- Nope.
0:20:59 > 0:21:01All the arms share the work.
0:21:01 > 0:21:04If the feet on one arm have smelled something good for dinner,
0:21:04 > 0:21:06the rest automatically follow.
0:21:06 > 0:21:11Imagine if we had five legs. Would we even managed to walk one metre?
0:21:11 > 0:21:13- And we have brains.- That's true.
0:21:13 > 0:21:15Wow, look, he's doing back-flips!
0:21:15 > 0:21:17Well, wouldn't you if you had five arms?
0:21:17 > 0:21:21Yeah, but those groovy moves that the spindly feather star does
0:21:21 > 0:21:22- would be fun too.- You've got it!
0:21:22 > 0:21:25The sea star and the feather star are linked together
0:21:25 > 0:21:29because they both travel around with their arms. Next please!
0:21:32 > 0:21:36Well, we couldn't do a show about cool, fishy ways of travelling
0:21:36 > 0:21:41without including this crazy contender, the crab. Look at him go!
0:21:41 > 0:21:45He moves completely sideways. You try running sideways - not easy!
0:21:45 > 0:21:47FAST DRUMBEAT
0:21:49 > 0:21:51Yep, feels totally unnatural!
0:21:55 > 0:21:56Now that's travelling.
0:21:56 > 0:22:00I've always wondered, could he walk forwards if he wanted to?
0:22:00 > 0:22:03- I can answer that.- OK, know-it-all!
0:22:03 > 0:22:05Because of how their legs are positioned,
0:22:05 > 0:22:09they can only move sideways. Their limbs are kind of hinged together.
0:22:09 > 0:22:12And they seem to tiptoe everywhere they go too.
0:22:12 > 0:22:15Running sideways on tiptoe - what an effort!
0:22:15 > 0:22:17It's no wonder they've got a quirky little running style!
0:22:19 > 0:22:21And he's another one with loads of legs.
0:22:21 > 0:22:25- He goes a bit faster than our brainless starfish.- Yeah!
0:22:25 > 0:22:29Our crazy crab is more nifty but he's connected to the sea star
0:22:29 > 0:22:32because they both have lots of legs to control.
0:22:32 > 0:22:35Here's something special for you - the flame shell!
0:22:39 > 0:22:44Is it me or is this animal flashing? Is there an ocean emergency?
0:22:44 > 0:22:49Yeah, quite a light show, hey? Flame shells are pretty impressive!
0:22:49 > 0:22:51That's a nice display he's giving us there
0:22:51 > 0:22:55- but he doesn't do much else, does he?- Ah, that's where you're wrong!
0:22:59 > 0:23:03- Look at him move! - Is that the same animal?
0:23:03 > 0:23:07- Yeah, but guess how he does it! Now, this is impressive.- Go on then.
0:23:07 > 0:23:10So this is a mollusc - it doesn't have fins, arms, or legs,
0:23:10 > 0:23:14- hands or feet.- So, doesn't have much going for it then, does he?
0:23:14 > 0:23:19Ah, yes it does. This geezer uses something called jet propulsion.
0:23:19 > 0:23:24OK, so they push themselves forward. But hang on a minute - how?
0:23:24 > 0:23:27Well, they move using all they have really - their shells.
0:23:27 > 0:23:30They open their shells, fill up with water,
0:23:30 > 0:23:33snap the shells together which forces the water out
0:23:33 > 0:23:37and jet-propels them sideways. They don't go fast but it's ingenious.
0:23:37 > 0:23:40Yeah, they move just using water and shells.
0:23:40 > 0:23:43When you put it like that, I guess it's pretty cool.
0:23:43 > 0:23:48They can't move forwards properly, more of an odd sideways thing -
0:23:48 > 0:23:49a bit like the crabs.
0:23:49 > 0:23:53It is a bit crab-like. So flame shells are connected to our crabs
0:23:53 > 0:23:55by their crazy sideways moves.
0:23:57 > 0:24:00FAIRGROUND MUSIC
0:24:00 > 0:24:03Roll up, roll up! See the magnificent performing squid!
0:24:03 > 0:24:07He flies through the air, we'll see, with the greatest of ease.
0:24:07 > 0:24:11It's the stupendous, swimming squid!
0:24:11 > 0:24:15He does look like he's on an invisible trapeze.
0:24:15 > 0:24:19They are like circus performers. They have no feet and no big fins.
0:24:19 > 0:24:21So how do you think they move?
0:24:21 > 0:24:23Hmm, good question.
0:24:23 > 0:24:26The squid takes jet propulsion to the extreme.
0:24:26 > 0:24:30This is like a real superpower - look at him go!
0:24:30 > 0:24:33How? Has he got a little rocket up his bum?
0:24:33 > 0:24:35No, it's a lot more simple than that.
0:24:35 > 0:24:38- See those jerky movements he's making?- Er, yeah.
0:24:38 > 0:24:41Well, that's him filling his body with water
0:24:41 > 0:24:46which he forces out of his siphon - this bit. That jets him forward.
0:24:46 > 0:24:50Cool! So it's a bit like filling this balloon with air and letting it go?
0:24:50 > 0:24:51Oh!
0:24:52 > 0:24:57Or, getting one of these squirty bath toys and er, squirting somebody!
0:24:59 > 0:25:01SHE LAUGHS
0:25:03 > 0:25:05That is a cool way of getting around.
0:25:05 > 0:25:08- That is the technique I would choose.- I like his little skirt.
0:25:08 > 0:25:11Typical! I'm talking about his superpower
0:25:11 > 0:25:14and all you can talk about is what he's wearing.
0:25:14 > 0:25:18Well, those are their fins. As you can see, they're a bit girly.
0:25:18 > 0:25:20- What's wrong with that? - That's my only problem.
0:25:20 > 0:25:23For an animal with such a super-cool power,
0:25:23 > 0:25:26he really needs to think about a makeover.
0:25:26 > 0:25:28- Well, I like it.- You would.
0:25:28 > 0:25:30I'd love to be a squid or a flame shell.
0:25:30 > 0:25:34Jet propulsion is such an awesome way of getting around.
0:25:34 > 0:25:38So the squid and flame shell are linked by their jet propulsion
0:25:38 > 0:25:41that helps them travel from A to B.
0:25:41 > 0:25:45Let's have a look back over our ocean transportation system.
0:25:45 > 0:25:46Come on, Barney!
0:25:48 > 0:25:49Coming!
0:25:54 > 0:25:56The reef is packed with groovy movers.
0:25:56 > 0:25:59And what's more, they are all connected.
0:25:59 > 0:26:02First up, our half-finished sunfish, who moves like a train
0:26:02 > 0:26:06on a bank holiday. He doesn't go very far, very fast but has found
0:26:06 > 0:26:09a unique way of moving, despite his lack of tail.
0:26:09 > 0:26:12Then there's our sideways-swimming triggerfish.
0:26:12 > 0:26:15He swims with ease but not as funkily as the flatworm
0:26:15 > 0:26:17or the Spanish dancer with his water workout.
0:26:19 > 0:26:22The cheeky imperial shrimp hitches a ride
0:26:22 > 0:26:24on the back of the Spanish dancer
0:26:24 > 0:26:27who at least travels faster than the one-footed snail,
0:26:27 > 0:26:30who can only move on one foot. Don't wait up for him...
0:26:30 > 0:26:34What about our walking frogfish? OK, he doesn't walk in a straight line,
0:26:34 > 0:26:36but not bad for something with no swim bladder!
0:26:36 > 0:26:40I think the epaulette is cool - a walking shark, that is a first!
0:26:40 > 0:26:44Unlike his cousins, the classic sharks. For them, it's swim or sink!
0:26:44 > 0:26:48Linked to our walking shark was our eight-legged runner, the octopus,
0:26:48 > 0:26:50who runs with his arms and legs,
0:26:50 > 0:26:54unlike the feather star, who swims quite badly with his feathery arms.
0:26:54 > 0:26:58They linked to the sea star, with his five legs and super coordination.
0:26:58 > 0:27:01And one of the quickest, quirkiest movers in the ocean - Mr Crab,
0:27:01 > 0:27:04who couldn't move forward if he tried.
0:27:04 > 0:27:06How about the flame shell? They can really move
0:27:06 > 0:27:08but not as fast as the super squid
0:27:08 > 0:27:11who jet-propels himself across the sea.
0:27:11 > 0:27:14Getting from A to B in the reef isn't always easy
0:27:14 > 0:27:17but our weird and wonderful animals always find a way,
0:27:17 > 0:27:23no matter how difficult or, er...uncool they might look.
0:27:27 > 0:27:29Come on, dolph, it's me and you.
0:27:29 > 0:27:31- DOLPHIN CALLS IN REPLY - We're coming!
0:27:31 > 0:27:34Come on, don't give up.
0:27:41 > 0:27:44Subtitles by Red Bee Media Ltd
0:27:44 > 0:27:46E-mail subtitling@bbc.co.uk