0:00:02 > 0:00:05Australia, home of possum, surfers, lingo - no worries, fair dinkum -
0:00:05 > 0:00:08lots of sunshine and the bonza Barrier Reef.
0:00:08 > 0:00:12It's the biggest, most spectacular, coral reef in the world.
0:00:12 > 0:00:15And what'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 > 0:00:23The miniscule, mammoth and miraculous. They're all connected.
0:00:46 > 0:00:49Yeah, tell me about it. Man United should never have let him go.
0:00:49 > 0:00:51What's that? More sand? Sure.
0:00:51 > 0:00:54That's just the good stuff. Just for you, that.
0:00:54 > 0:00:58Gem, I'm getting really attached to these ocean creatures, you know.
0:00:58 > 0:01:01- This is Colin, the sea cucumber. - G'day, mate.
0:01:01 > 0:01:03- He's got a name?- Colin.
0:01:06 > 0:01:08But he's not really a mate, is he, Barney?
0:01:08 > 0:01:12Don't listen to her, Colin. Doesn't know what she's talking about.
0:01:12 > 0:01:15I mean, he's not a real mate, that can give advice,
0:01:15 > 0:01:18for you to hang out with and do cool stuff with like, ahem,
0:01:18 > 0:01:20real friends.
0:01:20 > 0:01:22I see where you're going. Don't worry, you're still my mate.
0:01:22 > 0:01:25It's just that Colin needs my support now.
0:01:25 > 0:01:28It's a sea cucumber. He eats and poos sand.
0:01:28 > 0:01:29FARTING
0:01:29 > 0:01:32It lives in the ocean. It's got loads of friends here.
0:01:33 > 0:01:36Ah yes, the ocean is full of friendships.
0:01:36 > 0:01:39It's very "I'll scratch your back, you scratch mine".
0:01:39 > 0:01:43Our fishy friends hook up because they need each other to survive.
0:01:43 > 0:01:46But just like in the real world, some friends are closer than others
0:01:46 > 0:01:50and some you can probably live without. Ahem, sea cucumbers.
0:01:50 > 0:01:52Hey, you leave Colin out of this.
0:01:52 > 0:01:53Yeah!
0:01:58 > 0:01:59Ah, are you OK, wormy?
0:01:59 > 0:02:03Wanna cup of tea? A piece of cake? Or do you want a Jammy Dodger.
0:02:03 > 0:02:05TODDLER LAUGHS
0:02:13 > 0:02:14Yee-hah!
0:02:23 > 0:02:25Ooh, this is fun. Peekaboo.
0:02:25 > 0:02:27Mine's better. I've got balloons.
0:02:27 > 0:02:28Wha-hey!
0:02:30 > 0:02:31Where you hiding?
0:02:32 > 0:02:34Mum got me a pink one.
0:02:34 > 0:02:36TODDLER LAUGHS
0:02:36 > 0:02:39Now, show me someone who doesn't love a clownfish.
0:02:41 > 0:02:45Clownfish? Now, they're not really very funny, though, are they?
0:02:46 > 0:02:49No, not really. They are apparently called clownfish
0:02:49 > 0:02:52because they bob around in a clownish fashion.
0:02:52 > 0:02:55- Aah, they're so cute.- Huh?
0:02:55 > 0:02:59Meet our first best buddies, the anemone and clownfish.
0:02:59 > 0:03:03- One is a stinging ball of tentacles...- Rrrarrgh!
0:03:03 > 0:03:07- ..and one is a type of damsel fish.- Yee-hah!
0:03:07 > 0:03:10- They are unlikely best mates but that's what they are.- Cool.
0:03:10 > 0:03:14Clownfish have a clever way of making friends with this toughie.
0:03:14 > 0:03:16They coat themselves in the anemone's mucus
0:03:16 > 0:03:20which protects the clownfish from being stung by their tentacles.
0:03:20 > 0:03:24It sounds like a bit of a one-sided relationship,
0:03:24 > 0:03:28- OK for the clownfish with their bouncy castle anemone...- Yay!
0:03:28 > 0:03:30..but what does the anemone get out of it?
0:03:30 > 0:03:34Well, this is a classic reef symbiotic friendship -
0:03:34 > 0:03:36"I'll scratch your back and you scratch mine."
0:03:36 > 0:03:41The clownfish help to scare away other fish like the butterfly fish.
0:03:41 > 0:03:43They like to nibble on the anemone's tentacles.
0:03:43 > 0:03:47So, it's a case of "I'll rub myself in your tentacles,
0:03:47 > 0:03:48"cover myself in your snot,
0:03:48 > 0:03:52"help chase off bigger fish and then I can live in you, sting-free."
0:03:52 > 0:03:54Yeah, it's cool, innit?
0:03:54 > 0:03:55What?!
0:03:56 > 0:03:59The clownfish and the anemone have a fantastic friendship
0:03:59 > 0:04:02as they stick up for and protect each other.
0:04:05 > 0:04:09OK, Barney. I'll wash up all your dirty dishes
0:04:09 > 0:04:13- if you spot a seahorse in that fan. I'll give you five seconds.- Easy.
0:04:13 > 0:04:14Starting...now.
0:04:14 > 0:04:17He's over there, oh, no hang on, on the right.
0:04:17 > 0:04:20OK top left, no, he's in the middle.
0:04:22 > 0:04:26- Ha ha!- Oh, man!- Bad luck.
0:04:28 > 0:04:31- Here he is.- Isn't that just a piece of coral?
0:04:31 > 0:04:33Hang on. The coral just moved!
0:04:35 > 0:04:40Oh, when you said "seahorse", I was expecting one of these...
0:04:40 > 0:04:43I know, he is a funny-looking seahorse
0:04:43 > 0:04:47and part of the reason his seahorse face has been replaced by this snout
0:04:47 > 0:04:51is because he has such a close friendship with this Gorgonian coral
0:04:51 > 0:04:55that he has done whatever he can to look just like it!
0:04:55 > 0:04:57That's too close a friendship!
0:04:57 > 0:04:59A bit of dressing the same is understandable,
0:04:59 > 0:05:05but if my mate dressed exactly like me, that'd freak me out...
0:05:05 > 0:05:08OK! I'm officially freaked out.
0:05:08 > 0:05:11They're so like the coral it's weird.
0:05:11 > 0:05:15It would literally be like me turning into my home to the last detail.
0:05:17 > 0:05:20Hang on a minute. They might want to look like their home
0:05:20 > 0:05:25but are they really best mates? What does the coral get out of it?
0:05:25 > 0:05:26Well, not much.
0:05:26 > 0:05:28It's like your friend who eats all your sweets
0:05:28 > 0:05:32and never gives you back any in return.
0:05:34 > 0:05:35But the coral doesn't mind.
0:05:35 > 0:05:40I guess some friendships are just like that. Barney! That's mine!
0:05:40 > 0:05:43OK, there you go I don't want to be a pigmy-seahorse friend.
0:05:43 > 0:05:46They were nice.
0:05:46 > 0:05:48The connection between our clownfish gang
0:05:48 > 0:05:50and pygmy seahorse and coral fan
0:05:50 > 0:05:53is that they both live with their best friends.
0:05:53 > 0:05:55Right then, who's our next chummy duo?
0:06:01 > 0:06:05What has that crab got on his hands, oh, I mean, his pincers?
0:06:05 > 0:06:07Put 'em up!
0:06:07 > 0:06:10Well, he's got his hands full, OK?
0:06:10 > 0:06:13Full of ready-made mini stinging anemones.
0:06:13 > 0:06:15The boxer crab hasn't got his own sting -
0:06:15 > 0:06:17he borrows little anemones to ward off enemies.
0:06:17 > 0:06:21It can't be much fun being waved in the air like that.
0:06:21 > 0:06:23Oh, ouch, be careful!
0:06:23 > 0:06:27Actually there's more give-and-take in this friendship.
0:06:27 > 0:06:29While the boxer crab has a ready-made weapon
0:06:29 > 0:06:32he also uses his flowery hands to mop up leftovers
0:06:32 > 0:06:35so the anemones get to eat as well.
0:06:35 > 0:06:38Hang on, how does he get to eat when he's got his hands full?
0:06:38 > 0:06:41He's got a hands-free so he calls for a takeaway! Only kidding.
0:06:41 > 0:06:44His legs are specially adapted to rip off bits of food
0:06:44 > 0:06:48from the sea floor and then bring them to the mouth. Clever, innit?
0:06:48 > 0:06:50Ah. Well, he may be very clever
0:06:50 > 0:06:53but he actually looks like he's cheerleading...
0:06:53 > 0:06:55Ready? OK.
0:06:55 > 0:07:00C R A B carrying the anemones, to keep away his enemies!
0:07:00 > 0:07:052, 4, 6, 8, who do I appreciate? The anemone!
0:07:05 > 0:07:07I'm so good at cheerleading.
0:07:07 > 0:07:10So, our bezzie mate boxer and anemone
0:07:10 > 0:07:12are connected to our pygmy and coral buddies
0:07:12 > 0:07:15because they each use each other for protection.
0:07:24 > 0:07:26The mantis shrimp has never been
0:07:26 > 0:07:28a very popular member of the ocean community.
0:07:28 > 0:07:33A loner, he is often to be found underneath rocks, alone,
0:07:33 > 0:07:36or spring cleaning his home, alone.
0:07:36 > 0:07:40Some think his tidiness obsession is to occupy his time
0:07:40 > 0:07:45- because he has...no friends. - Ahh...poor mantis shrimp!
0:07:45 > 0:07:47Never mind "poor mantis shrimp", Gem.
0:07:53 > 0:07:55He's on his own for a reason.
0:07:55 > 0:07:59Oi, mantis shrimp! Leave that crab alone.
0:08:05 > 0:08:07Come on now, leave it out.
0:08:07 > 0:08:09Stop it, you're bigger than he is.
0:08:09 > 0:08:13Now look what you've done. You've broken his pincer. Meanie!
0:08:13 > 0:08:19See, told you he's a big bully and that's why he has no friends.
0:08:19 > 0:08:22Why's he beating that crab up, that was a bit unnecessary.
0:08:22 > 0:08:25Well, to be fair, he has to eat something,
0:08:25 > 0:08:28but he doesn't go for the easy kill. He likes a good punch-up first,
0:08:28 > 0:08:31which is why he has a reputation as an ocean bully.
0:08:31 > 0:08:35And with supersonic eyes that pick out his victims from miles away,
0:08:35 > 0:08:37and a right-hook that can smash through glass,
0:08:37 > 0:08:39he certainly has the right qualities.
0:08:39 > 0:08:42So, he's friendless but it's easy to see why.
0:08:44 > 0:08:46So, the mantis shrimp is a bully
0:08:46 > 0:08:48and the boxer crab teams up with the anemones
0:08:48 > 0:08:50to protect himself from bullies.
0:08:50 > 0:08:52It's a bizarre bully connection.
0:08:52 > 0:08:56So, who's our other connection to the boxer crab and his anemone friend?
0:09:01 > 0:09:04Is that a fish prison, they look trapped!
0:09:04 > 0:09:08This painful-looking spiky urchin and these cardinalfish are best buddies.
0:09:08 > 0:09:11G'day, urchin, mate.
0:09:12 > 0:09:14Hello.
0:09:14 > 0:09:17Now the clownfish and their bouncy anemones I can understand.
0:09:17 > 0:09:19Yee-hah!
0:09:19 > 0:09:23But this can't be a comfortable place to hang out. What's the point?
0:09:23 > 0:09:26What's the point... Cos it's got spikes...!
0:09:26 > 0:09:27Yeah. I got it.
0:09:27 > 0:09:29Ah, you're a wee man!
0:09:29 > 0:09:31Actually it's a perfect hang-out.
0:09:31 > 0:09:34- You see the black stripes on the cardinalfish?- Yeah.
0:09:34 > 0:09:37When these guys hang out in the urchins' long black spikes
0:09:37 > 0:09:40their outline is disguised from predators!
0:09:40 > 0:09:42Ooh-la-lah!
0:09:42 > 0:09:45I see, they are very crafty fish
0:09:45 > 0:09:48because they make friends with all the pointy and stingy animals.
0:09:48 > 0:09:50Do the urchins get any benefit?
0:09:50 > 0:09:53Well, actually no. They don't get anything in return.
0:09:53 > 0:09:55It's another one-sided relationship.
0:09:55 > 0:10:00- But I guess if you're a big, scary, spiky urchin...- Raarrrgh!
0:10:00 > 0:10:03..maybe you just need all the friends you can get.
0:10:03 > 0:10:07In other words the sea urchins stick up for the cardinalfish!
0:10:07 > 0:10:10Ha-ha... Stick up... Like the spikes.
0:10:11 > 0:10:15I think you should be locked up for those jokes.
0:10:15 > 0:10:18Anywhere but the fish prison, far too spiky for me.
0:10:18 > 0:10:21Anyway, moving on, connection time.
0:10:21 > 0:10:24The boxer crab gets protection from his stingy anemone gloves.
0:10:24 > 0:10:27The cardinalfish protects himself from the big bad reef
0:10:27 > 0:10:30by living in a spiky urchin fortress.
0:10:30 > 0:10:33So, they both use their mates for protection.
0:10:33 > 0:10:34I wish I had a fortress.
0:10:34 > 0:10:38Ah, nice to see some real friends hanging out on the reef together.
0:10:38 > 0:10:41And look, Barney, I've made you a little sand turtle.
0:10:41 > 0:10:45Oh, that's nice. I'd have preferred a mountain bike though.
0:10:45 > 0:10:47OK, it's time for a reef-cap.
0:10:50 > 0:10:53Loads of animals on the reef hang out with their mates
0:10:53 > 0:10:55We've met some of the bestest friends ever.
0:10:55 > 0:11:00But how did we get all the way from the clownfish and his bouncy anemones
0:11:00 > 0:11:02to the locked-up cardinalfish?
0:11:02 > 0:11:06Well, our first magnificent mates were the clownfish and the anemone.
0:11:06 > 0:11:09The clownfish gets a home, and the anemone gets protection
0:11:09 > 0:11:11from those pesky butterfly fish.
0:11:11 > 0:11:15Next up, the pygmy seahorse and his close coral fan.
0:11:15 > 0:11:17A little too close, maybe,
0:11:17 > 0:11:20as the pygmy seahorse completely copies the coral fan.
0:11:23 > 0:11:27And if you're a little boxer crab who wants to be tougher than he is,
0:11:27 > 0:11:30a portable anemone is just the trick to scare away enemies.
0:11:30 > 0:11:33Luckily the anemones get fed on the way.
0:11:33 > 0:11:37Unlike the badly-behaved mantis shrimp.
0:11:37 > 0:11:40Pick on someone your own size, shrimpy!
0:11:40 > 0:11:43- He's not all that bad. - He doesn't need sticking up for.
0:11:43 > 0:11:47Unlike the crafty cardinalfish hiding away in a spiky sea urchin.
0:11:48 > 0:11:51- Ah, is that a shell for me? - No, it's mine.
0:11:51 > 0:11:53You're so shellfish.
0:12:02 > 0:12:08The glass shrimp and the mushroom coral with their delicate tentacles.
0:12:08 > 0:12:10Now, these pair are a match made in heaven.
0:12:10 > 0:12:13Coral, you're my best friend.
0:12:14 > 0:12:17They should be called invisible shrimps!
0:12:17 > 0:12:20Well, the glass shrimp, as their name suggests,
0:12:20 > 0:12:23are delicate little shrimps.
0:12:23 > 0:12:26They're so see-through that sometimes you can only see them
0:12:26 > 0:12:27by coloured dots on their bodies.
0:12:27 > 0:12:31And, being so titchy, they need a nice comfy place to hang out.
0:12:31 > 0:12:34And where better than this spongy mushroom coral?
0:12:34 > 0:12:37- Hey, is that a camera?! - Fish! Get out the way!
0:12:37 > 0:12:39As I was saying, the mushroom coral
0:12:39 > 0:12:43is also quite a sensitive little fellow. Fish! Out!
0:12:43 > 0:12:46But it's happy with the glass shrimp because it weighs so little.
0:12:46 > 0:12:50I'm guessing the mushroom coral might also protect the shrimp
0:12:50 > 0:12:52from naughty fish who want their camera close-up?
0:12:52 > 0:12:55OK, fish! Have your moment.
0:12:55 > 0:12:59- Hi, Mum!- Was that it? I've met caviar with more to say!
0:12:59 > 0:13:02Our little glass shrimp hides and plays in the mushroom coral
0:13:02 > 0:13:05and the cardinalfish hangs out with the sea urchin
0:13:05 > 0:13:07because they're both camouflage buddies.
0:13:09 > 0:13:12Now, who do these fellows remind you of?
0:13:12 > 0:13:15Hmm! Look like Yoda, I do.
0:13:15 > 0:13:18Hey, it's Yoda! I didn't know he could swim!
0:13:18 > 0:13:21So, meet the spoilt brats of the reef - the remoras.
0:13:21 > 0:13:25Remora fish hang out with the big boys of the reef
0:13:25 > 0:13:27like the magnificent manta here.
0:13:27 > 0:13:29They don't care that much about the manta.
0:13:29 > 0:13:33All they're after is a free ride, a free meal and free protection.
0:13:36 > 0:13:39They choose any big fish they can hitch a ride with.
0:13:39 > 0:13:43I see, they're like those annoying friends you can't get rid of.
0:13:43 > 0:13:47- Give me some space, go away. - Back off, buster!
0:13:47 > 0:13:49They're the mate who nicks your lunch,
0:13:49 > 0:13:52borrows all your clothes and won't return them
0:13:52 > 0:13:55and really doesn't do much to help you out at all.
0:13:55 > 0:13:57- BOTH:- Thank goodness, you're not like that.
0:14:00 > 0:14:03Why don't the bigger fish just shrug them off?
0:14:03 > 0:14:05You can do without friends like that, surely.
0:14:05 > 0:14:07That's the problem.
0:14:07 > 0:14:10When I said they were hangers-on, I wasn't kidding.
0:14:10 > 0:14:13They have these Velcro-like pads on the top of their heads
0:14:13 > 0:14:19that suck on to big fish meaning they can really hang on, and on, and on.
0:14:19 > 0:14:23So, they get free lifts without having to lift a finger.
0:14:23 > 0:14:24Well, fin without the ger.
0:14:24 > 0:14:26You're no friend of mine.
0:14:26 > 0:14:29They are such freeloaders, they don't miss a trick.
0:14:29 > 0:14:32Oh, did that remora just eat shark poo.
0:14:32 > 0:14:35Yeah. They don't turn down any freebie these guys, even poo.
0:14:37 > 0:14:39Like the glass shrimp and his mushroom coral,
0:14:39 > 0:14:43the remoras are not really mates with the mantas and the sharks.
0:14:43 > 0:14:46They are just hanging out with them for the bonus benefits.
0:14:46 > 0:14:47What? Poo?
0:14:50 > 0:14:53Oh, no!
0:14:53 > 0:14:59Get off. Get off my head. Get off. Give me some space.
0:14:59 > 0:15:03Looks like this little fish has an unwanted hanger-on as well.
0:15:03 > 0:15:08Yeah, that's a parasite and for fish these are pretty evil visitors.
0:15:08 > 0:15:11This is one of those "I'm going to stick to your head
0:15:11 > 0:15:12"and really annoy you" variety.
0:15:12 > 0:15:14Can't the fish just brush it off?
0:15:14 > 0:15:18They don't have brushes and this parasite is a bit like a leech.
0:15:18 > 0:15:20Once it's on, it is difficult to shake of
0:15:20 > 0:15:22and it can make the fish feel pretty poorly.
0:15:22 > 0:15:26Usually fishes' mucus covered scales help put off parasites
0:15:26 > 0:15:30but, sometimes, like all best laid plans, that doesn't always work.
0:15:30 > 0:15:32And this sunfish is positively,
0:15:32 > 0:15:36or should I say parasitely, covered in them.
0:15:38 > 0:15:40This geezer is lucky because he has mates,
0:15:40 > 0:15:45the banner fish, and they are around to help nibble on the parasites.
0:15:45 > 0:15:46But our poor damsel fish
0:15:46 > 0:15:49looks like he's stuck with this hanger-on for good.
0:15:49 > 0:15:53- No!- Ha-ha-ha! I'm not leaving.
0:15:53 > 0:15:56Like our remoras who stick around with their so-called friends
0:15:56 > 0:16:00purely for selfish reasons our parasites are one group of friends
0:16:00 > 0:16:02our damsel fish could live without.
0:16:02 > 0:16:06- There you go.- Aah. Thank you.
0:16:06 > 0:16:08Where are my sandwiches?
0:16:08 > 0:16:11Well, I couldn't find any witches so I just got you sand.
0:16:11 > 0:16:13I did a joke about sandwiches.
0:16:13 > 0:16:15OK, it's time for reef-cap.
0:16:19 > 0:16:24Ocean animals know a good friend when they see one, unlike Barney here.
0:16:24 > 0:16:26Not true, I saw Colin and I said hello.
0:16:26 > 0:16:28Our delicate little glass shrimp
0:16:28 > 0:16:31knows the best place to stay safe is in his mushroom bouncy coral.
0:16:31 > 0:16:33And they keep the coral pest free.
0:16:33 > 0:16:35And they got on. Imagine having a load of friends
0:16:35 > 0:16:39that you just can't get rid of, a bit like the sponging remora.
0:16:39 > 0:16:41Very irritating but not as much as having
0:16:41 > 0:16:44a giant parasite stuck to your head.
0:16:44 > 0:16:47There are some mates that are really not much fun
0:16:47 > 0:16:49and this bloodsucker is one of them.
0:16:49 > 0:16:52I hope we are going to see some nice friendships in this half.
0:16:52 > 0:16:55You see, I think the key to a good friendship is communication.
0:16:55 > 0:16:58You talk to someone and you know they're listening.
0:16:58 > 0:17:02- ..Er, Tuesday...- You weren't even listening, were you?
0:17:02 > 0:17:05- ..five o'clock.- Oh, typical!
0:17:05 > 0:17:09Luckily our next best mates are a little more considerate.
0:17:13 > 0:17:17- Well, they are happy little chappies who are they?- As I said,
0:17:17 > 0:17:21"The key to a good friendship is communication," and these buddies
0:17:21 > 0:17:25have it sussed. Let me introduce the cleaner wrasse.
0:17:25 > 0:17:28As their name suggests they spend their time cleaning up,
0:17:28 > 0:17:32nibbling nasties off the skin of fishes to stop them getting poorly.
0:17:32 > 0:17:35Barney, look, he's doing a little dance.
0:17:35 > 0:17:38Well, I'm glad he's enjoying himself, but why?
0:17:38 > 0:17:40Well, this is his way of saying, "I'm free!
0:17:40 > 0:17:44"Hello, fishes, anyone want a clean up? I'll clean you good."
0:17:44 > 0:17:47Then why doesn't he just say that instead of showing off?
0:17:47 > 0:17:51Barney, fish can't talk. D'oh! So they do a little dance instead.
0:17:51 > 0:17:55- Oh, no!- How do the cleaner wrasse know which fish wants cleaning?
0:17:55 > 0:17:57- They strike a pose.- Come clean me.
0:17:57 > 0:18:00- I'm ready.- Give me a clean, eh?
0:18:00 > 0:18:02- I need a scrub. - Don't forget my left fin.
0:18:02 > 0:18:03Thanks mate.
0:18:05 > 0:18:07Ready for a scrub down.
0:18:07 > 0:18:10Hiya, mate, give us a scrub down will you?
0:18:10 > 0:18:12This is a complete mutual appreciation friendship.
0:18:12 > 0:18:17The fish love the cleaner wrasse and the wrasse love the fish.
0:18:17 > 0:18:21You're my bezzie mate. About time we had a proper friendship.
0:18:21 > 0:18:24- Oh, do you need a clean up?- Your spots are looking good.
0:18:24 > 0:18:26Your lips are looking good too.
0:18:26 > 0:18:28Do you think?
0:18:28 > 0:18:32- The wrasse have a real taste for the gnathiid isopods.- I am sorry, what?
0:18:32 > 0:18:36The gnathiid isopods, otherwise known as deadly parasites.
0:18:36 > 0:18:40They can make the fish very ill indeed
0:18:40 > 0:18:43but are a real tasty snack for the cleaner wrasse.
0:18:43 > 0:18:48- OK, so the wrasse get a nice feast of the gnathiid...- Gnathiid isopods.
0:18:48 > 0:18:50Yes. And the fish get a nice clean skin without infection
0:18:50 > 0:18:54- meaning that they can swim along and get on with their day.- Exactly.
0:18:54 > 0:18:55Ha-ha-ha!
0:18:56 > 0:18:59They are linked through sickness and health.
0:19:09 > 0:19:12- Wow, quite a display going on here. - I know!
0:19:12 > 0:19:15These schools of fish are amazing, aren't they?
0:19:15 > 0:19:19They are so graceful and well co-ordinated.
0:19:23 > 0:19:25I mean, how do they do that?
0:19:25 > 0:19:27Is there a sergeant major fish going,
0:19:27 > 0:19:31"And to the left, to the right, all together boys and girls!
0:19:31 > 0:19:32"Let's make a crazy ball."
0:19:37 > 0:19:40- But seriously, their timing is impeccable, isn't it?- Yeah.
0:19:40 > 0:19:43That's because this is one tight-knit group of friends, all right.
0:19:43 > 0:19:46- You're telling me, they even look the same.- I know.
0:19:46 > 0:19:49They don't hang out with any old fish they choose their school mates well.
0:19:49 > 0:19:53Oh, school mates, very clever, Gem.
0:19:53 > 0:19:55Thank you.
0:19:55 > 0:19:58They're like those cliquey gangs you can never get in with
0:19:58 > 0:20:02but with the fish schools it's all about sticking together for survival.
0:20:02 > 0:20:05If one fish finds a rich source of food, they all follow.
0:20:05 > 0:20:06Follow that fish.
0:20:06 > 0:20:09Doesn't it confuse their predators though?
0:20:09 > 0:20:11It confuses and intimidates them.
0:20:11 > 0:20:13Argh!
0:20:13 > 0:20:16Predators may be fooled into thinking they are looking at one big fish
0:20:16 > 0:20:18or it's just too much like hard work.
0:20:18 > 0:20:21Aah, pesky fish balls.
0:20:22 > 0:20:25There are also more eyes to watch for danger,
0:20:25 > 0:20:27like a giant neighbourhood watch gang.
0:20:27 > 0:20:31- What do you call a guy with loads of eyes?- I don't know.
0:20:31 > 0:20:33Seymour, because he can see more.
0:20:33 > 0:20:37Like our cleaner wrasse and their fishy friends, our schools of fish
0:20:37 > 0:20:40also have a fantastic friendship and stick together for survival.
0:20:40 > 0:20:42Ah it is good to know there are
0:20:42 > 0:20:44some nice friendships in the reef.
0:20:44 > 0:20:47So, who's on next, bosom buddy.
0:20:51 > 0:20:57It's another shrimp cleaning up. Get a life, mate, seriously.
0:20:57 > 0:21:02Hey, don't shout at the shrimp or you may have to deal with the scary goby.
0:21:02 > 0:21:05If you not from the burrow you're not coming in.
0:21:05 > 0:21:09These fish are shrimp bodyguards. They live together with the shrimp.
0:21:09 > 0:21:13While the shrimp tidies and builds the burrow, the gobies keep watch.
0:21:13 > 0:21:17Sid, keep an eye on that dodgy geezer over there would you?
0:21:17 > 0:21:19Ho-ho! Oh-ho!
0:21:19 > 0:21:23They take their work very seriously, don't they?
0:21:23 > 0:21:27Oh, yes, these gobies are not to be messed with.
0:21:27 > 0:21:28You looking at me?
0:21:28 > 0:21:31They're very protective over their mate shrimpy here.
0:21:31 > 0:21:34Shrimpy, stay indoors it's not safe.
0:21:34 > 0:21:36I'll just get rid of this rubble.
0:21:36 > 0:21:40And they're in constant contact with their shrimpy buddies.
0:21:40 > 0:21:43The shrimp keeps its antennae touching the body of the goby
0:21:43 > 0:21:46who flicks the shrimp with its tail when it's alarmed.
0:21:46 > 0:21:50Then they both scarper into the burrow and they are safe as houses.
0:21:50 > 0:21:54So, Gem, salt and pepper, bucket and spade, egg and spoon.
0:21:54 > 0:21:56I understand why they're pairs
0:21:56 > 0:21:59but fish and shrimp?! That's got to be the most unlikely pairing ever.
0:21:59 > 0:22:01Well, yeah I hear what you're saying
0:22:01 > 0:22:04but like all good friendships I guess opposites attract.
0:22:04 > 0:22:07Plus, they both get lots from being buddies.
0:22:07 > 0:22:10The shrimp gets a warning of approaching danger and the goby
0:22:10 > 0:22:13gets a nice and very clean home to lay its eggs.
0:22:13 > 0:22:16Ah, how touching, another life-saving friendship.
0:22:16 > 0:22:18Stay away from my shrimp friend.
0:22:18 > 0:22:19Both the fish schools
0:22:19 > 0:22:21and the shrimp and goby look after
0:22:21 > 0:22:23each other to help stay alive.
0:22:23 > 0:22:26So, who are our next chumsters?
0:22:28 > 0:22:32These cute little fish are looking right at ya!
0:22:32 > 0:22:36Meet the twinspot gobies, they have, well, twin spots.
0:22:36 > 0:22:38And there's two of them, like twins.
0:22:38 > 0:22:40- Here we are.- Hello.
0:22:40 > 0:22:44Hang on, which is their front and which is their back end?
0:22:44 > 0:22:45That's a good question.
0:22:45 > 0:22:47Their two-spotted fin is confusing to our eyes
0:22:47 > 0:22:50and even more confusing to the underwater world.
0:22:50 > 0:22:53In fact they are also named the crab-eye goby
0:22:53 > 0:22:56because they pretend to be a crab to fool predators.
0:22:56 > 0:22:58Oops.
0:22:58 > 0:23:01And like twins, they obviously have a very close friendship,
0:23:01 > 0:23:02they even move in sync.
0:23:02 > 0:23:04They have a funny little swimming style,
0:23:04 > 0:23:07not helped by the fact that those crafty eye spots
0:23:07 > 0:23:10completely confuse the eye. Let's take a closer look.
0:23:10 > 0:23:12Ah!
0:23:12 > 0:23:13There's the real eye.
0:23:13 > 0:23:15Hang on, or is that it?
0:23:15 > 0:23:17They are very clever little gobies, aren't they?
0:23:17 > 0:23:21Now you're saying.
0:23:21 > 0:23:23They are what's known as bottom feeders. They spend
0:23:23 > 0:23:26most of their time munching on sand to filter through any nibbles.
0:23:26 > 0:23:30So, are they twins, or just bezzie mates?
0:23:30 > 0:23:34Well, they are very, very close friends, if you get my meaning.
0:23:34 > 0:23:36Um, no.
0:23:36 > 0:23:38Brace yourself, Gem, romantic moments coming.
0:23:41 > 0:23:45You see they are more than just friends, they are in lurve.
0:23:45 > 0:23:50- You're kidding?- No, gobies mate for life and are soul mates,
0:23:50 > 0:23:52which may explain why they are so in sync.
0:23:52 > 0:23:57Like our goby and shrimp our twinspot gobies are together for good,
0:23:57 > 0:23:59looking after each other.
0:23:59 > 0:24:00Ah, forever friends.
0:24:08 > 0:24:10Well, hello there.
0:24:10 > 0:24:14Er, talking of romance, wait until you hear about
0:24:14 > 0:24:16this smooth customer.
0:24:16 > 0:24:21Hi, I'm Napoleon, Napoleon wrasse. How delightful to meet you, Gemma.
0:24:21 > 0:24:24Ooh, and you too, Napoleon.
0:24:24 > 0:24:27You see this geezer's a real charmer.
0:24:27 > 0:24:30See how he's surrounded by ladies.
0:24:30 > 0:24:33They are the ones without the hump.
0:24:35 > 0:24:37Only the males have humps.
0:24:37 > 0:24:40It's though they need them to balance out their big mouths.
0:24:40 > 0:24:44Yeah, what is that with the big old gob? Is it for all the kissing?
0:24:44 > 0:24:47Oh, I don't want to know!
0:24:47 > 0:24:48Well, actually, I can tell you.
0:24:48 > 0:24:51He feeds on shells so he needs it to crush them up.
0:24:51 > 0:24:53Yawn!
0:24:53 > 0:24:55Anyway, back to the romance.
0:24:56 > 0:24:59Ooh-la-la!
0:24:59 > 0:25:02The Napoleon wrasse likes to make friends with the ladies.
0:25:02 > 0:25:06In fact he has lots of girlfriends who all hang out together
0:25:06 > 0:25:10under the protection of one macho male Napoleon. Like this one.
0:25:10 > 0:25:14- Hi there, ladies.- Ooh, hi, Napoleon. Hello!
0:25:14 > 0:25:16I mean it seems a bit old-fashioned to me
0:25:16 > 0:25:19but I guess some females just need protection.
0:25:19 > 0:25:21- BUZZ! - Oh, my...!
0:25:24 > 0:25:28And what's more, when they're flirting the hump darkens.
0:25:28 > 0:25:31Oh, so I guess they wear their heart on their hump then?
0:25:31 > 0:25:34You know, like heart on sleeve?
0:25:34 > 0:25:37So, just like our cute twinspot gobies
0:25:37 > 0:25:38our Napoleon wrasse
0:25:38 > 0:25:39has a group of friends
0:25:39 > 0:25:41who are more than just friends.
0:25:41 > 0:25:44It's tricky being friends in the ocean world.
0:25:44 > 0:25:46Let's take a look back at all our bezzie mates.
0:25:50 > 0:25:53From the clownfish all the way to the Napoleon wrasse
0:25:53 > 0:25:56there's ocean buddies galore.
0:25:56 > 0:25:58- Ah.- Wha-hey!
0:25:58 > 0:25:59It's great to be a clownfish.
0:25:59 > 0:26:02Especially with their bouncy-castle anemone.
0:26:02 > 0:26:06Imagine being so close to your friend you copy them down to their spots.
0:26:06 > 0:26:09Well, that's exactly what our pygmy seahorses do.
0:26:09 > 0:26:11Oh, that's touching.
0:26:12 > 0:26:15Mr boxer crab carries his buddy anemone on his pincers
0:26:15 > 0:26:17to use their sting as protection
0:26:17 > 0:26:20but also for a spot of cheerleading.
0:26:20 > 0:26:22Then there's Mr mantis shrimp no mates.
0:26:22 > 0:26:24Well if you do insist on beating up crabs, shrimpy!
0:26:24 > 0:26:27Yeah, those crabs need sticking up for.
0:26:27 > 0:26:29Just like our cardinalfish, hiding
0:26:29 > 0:26:31with their mates the spiky sea urchins.
0:26:31 > 0:26:35And our fragile glass shrimp knows a good coral when he sees one.
0:26:35 > 0:26:39The most annoying friend ever, the stick-on remoras, who decide
0:26:39 > 0:26:43who they want to hang around with and then won't leave them alone.
0:26:43 > 0:26:46Can't they take a hint? Hey, remora, leave me alone.
0:26:46 > 0:26:50Apparently not. Like this infuriating parasite,
0:26:50 > 0:26:52now that really is too close for comfort.
0:26:52 > 0:26:54Leave him alone, you evil parasite.
0:26:54 > 0:26:58Thank goodness for the cleaner wrasse and their fishy mates.
0:26:58 > 0:27:01They even communicate through dance! What a nice gang.
0:27:01 > 0:27:03Talking of gangs, our silvery skilful schools of fish
0:27:03 > 0:27:06must be the greatest group of friends going but you have to
0:27:06 > 0:27:09look the part to fit into their cliquey circle.
0:27:09 > 0:27:12Next up, the goby and shrimp, unlikely pals
0:27:12 > 0:27:13but it seems they've hit if off
0:27:13 > 0:27:17as long the shrimp keeps their burrow nice and tidy that is.
0:27:17 > 0:27:20And now for our special friends -
0:27:20 > 0:27:21the twinspot gobies.
0:27:21 > 0:27:25So twin-like they copy each other. And they are more than just friends.
0:27:25 > 0:27:28They're in love. Aw, so cute.
0:27:28 > 0:27:31You can't call Mr Napoleon wrasse cute
0:27:31 > 0:27:34but he does seem to have a way with the ladies.
0:27:34 > 0:27:37Well, hello.
0:27:37 > 0:27:39You know what, Gem, you might not always wash up
0:27:39 > 0:27:42or share your sweets but I must say, after that lot,
0:27:42 > 0:27:44I'm happy to have you as my friend.
0:27:44 > 0:27:48Ah, thanks, so you don't mind me having your last sweetie then?
0:27:48 > 0:27:50Hey, I was saving that for Colin.
0:27:52 > 0:27:53Yeah.
0:27:55 > 0:27:58Subtitles by Red Bee Media Ltd.
0:27:58 > 0:28:01E-mail subtitling@bbc.co.uk