0:00:02 > 0:00:04- HE WHISTLES - Let's ski-doodle, Okidoodle!
0:00:04 > 0:00:07- # Messy goes to Okido - Find out what you want to know
0:00:07 > 0:00:10# Let's all go to Okido
0:00:10 > 0:00:12# Okido, Okido!
0:00:12 > 0:00:14# Messy goes to Okido
0:00:14 > 0:00:16# All the things you want to know
0:00:16 > 0:00:18# Come along and say hello
0:00:18 > 0:00:20# Let's go see our friends
0:00:20 > 0:00:22- Felix! - # Okido
0:00:22 > 0:00:24- Zoe! - # Okido
0:00:24 > 0:00:27- Zim, Zam, Zoom! - # Okido
0:00:27 > 0:00:28# Ba-barap, whoop-whoo!
0:00:28 > 0:00:30# Messy goes to Okido
0:00:30 > 0:00:33# Let's all go to Okido
0:00:33 > 0:00:35# Find out what you need to know
0:00:35 > 0:00:37- # Messy goes to Okido!- #
0:00:41 > 0:00:44HORN BLOWS
0:00:44 > 0:00:48Look what I've got. It makes this amazing sound.
0:00:48 > 0:00:50HORN BLOWS
0:00:50 > 0:00:52Hee-hee-hee!
0:00:53 > 0:00:57HORN BLOWS AND ECHOES
0:00:57 > 0:00:59- Oh! Who was that? - ECHO:- 'Who was that?'
0:00:59 > 0:01:01What? 'What?'
0:01:01 > 0:01:04Well, if you won't tell me who you are,
0:01:04 > 0:01:06I'm going to Okido to find out.
0:01:06 > 0:01:10When you need to know, go to Okido.
0:01:23 > 0:01:24Hello!
0:01:24 > 0:01:28- Hello.- Oh, no, he's followed me here.
0:01:28 > 0:01:30Oh!
0:01:32 > 0:01:34- Fooled you!- Yes, you did.
0:01:34 > 0:01:38I thought you were the invisible person from my house.
0:01:38 > 0:01:41Don't be silly. People can't be invisible.
0:01:41 > 0:01:45But I heard him. He was copying what I said.
0:01:45 > 0:01:46WATCH BEEPS
0:01:46 > 0:01:49- Hello.- Hello, Zoe. We need your help.
0:01:49 > 0:01:53We're hearing some very strange sounds and can't find the source.
0:01:53 > 0:01:57- Maybe it's my invisible person. - We'll be right there, Zim.
0:01:57 > 0:02:01Come on. Zim needs us.
0:02:01 > 0:02:03MESSY WHISTLES
0:02:04 > 0:02:07Let's ski-doodle, Okidoodle!
0:02:16 > 0:02:19Where is it coming from?
0:02:19 > 0:02:21I just can't identify it.
0:02:21 > 0:02:24- What is it, Zim? - We don't know.
0:02:24 > 0:02:27We were on our way back from the mountains,
0:02:27 > 0:02:30when we heard a clicking sound. It's very distracting.
0:02:30 > 0:02:35We've tried everything, so we thought you could help us look.
0:02:35 > 0:02:37- CLICKING - Over there.
0:02:41 > 0:02:42What was that?
0:02:49 > 0:02:50CLICKING
0:02:50 > 0:02:53- Oh, hello.- Oh, hello.
0:02:53 > 0:02:54CLICKING
0:02:54 > 0:02:57Where did you come from?
0:02:57 > 0:03:00It must have been through there.
0:03:00 > 0:03:04Whoa!
0:03:04 > 0:03:05Oops.
0:03:07 > 0:03:09Hello, little bat.
0:03:09 > 0:03:12Oh, so that's what was making the clicking sound.
0:03:12 > 0:03:16A bat, my favourite mammal. Well done, you three.
0:03:19 > 0:03:21A-ha, yes, just as I thought.
0:03:21 > 0:03:24It's an Okido long-eared bat.
0:03:24 > 0:03:26Quite a young one, I'd say,
0:03:26 > 0:03:29and it lives in caves in the Okido mountains.
0:03:29 > 0:03:33Where we've just come back from. How did it get in?
0:03:33 > 0:03:36Someone left a window open.
0:03:36 > 0:03:37- Zim?- Oops.
0:03:37 > 0:03:39Oh, well, it can't live here.
0:03:39 > 0:03:42It needs to be with its friends.
0:03:42 > 0:03:44We'll have to take it home again.
0:03:44 > 0:03:46We're going to the mountains.
0:03:46 > 0:03:51Great socks! Did you hear that, bat? We're taking you home.
0:03:54 > 0:03:57I thought it was my turn to drive.
0:03:57 > 0:04:00No, it's your turn to press the booster button.
0:04:00 > 0:04:02Anybody can press a button.
0:04:02 > 0:04:05I always press the booster button.
0:04:10 > 0:04:14You can come down now, little bat. We won't hurt you.
0:04:14 > 0:04:16Are you thirsty?
0:04:16 > 0:04:18CLICKING
0:04:21 > 0:04:23Here you go, batty-bat.
0:04:23 > 0:04:27I don't think bats drink from bottles, Messy.
0:04:27 > 0:04:31I can find out how bats drink.
0:04:36 > 0:04:41Look. Is that how you drink? From a lake or a river?
0:04:41 > 0:04:42CLICKING
0:04:42 > 0:04:45I'll ask Zam if she can find one for you.
0:04:55 > 0:04:59Oh, it's dark. How's the bat going to find its way?
0:05:04 > 0:05:06Bats are used to the dark.
0:05:06 > 0:05:09They're awake at night rather than in the daytime
0:05:09 > 0:05:13and so they use sound to find their way around and to find food.
0:05:13 > 0:05:17But bat is still making that clicking noise. Why does it do that?
0:05:17 > 0:05:19When bats make their clicking noise,
0:05:19 > 0:05:23they're sending out tiny bits of sound called sound waves.
0:05:23 > 0:05:26When those sound waves hit something, they bounce back.
0:05:26 > 0:05:30- So, sound can bounce off things? - Exactly.
0:05:32 > 0:05:36Sound bounces and comes back just like a ball.
0:05:36 > 0:05:39If it hits something and you're the right distance away,
0:05:39 > 0:05:41you hear it coming back.
0:05:41 > 0:05:45That's called an echo and now comes the clever bit.
0:05:45 > 0:05:48The bat has very large ears.
0:05:48 > 0:05:52The bat's ears can hear the echoes much better than we can
0:05:52 > 0:05:55and then its brain uses the echoes to work out where things are
0:05:55 > 0:05:59and what shape they are. Bats can tell the difference
0:05:59 > 0:06:02between the size and shape and feel of things, even water,
0:06:02 > 0:06:05because of the way the sound waves bounce.
0:06:05 > 0:06:08Whales and dolphins can do it too and another thing
0:06:08 > 0:06:11- that's very interesting is that... - Oh, you do go on.
0:06:11 > 0:06:14Have you all forgotten? We've got a cave to find.
0:06:14 > 0:06:19- I believe it's my turn to drive. - We'll see.
0:06:26 > 0:06:28What about those caves?
0:06:28 > 0:06:31Are any of them your home?
0:06:31 > 0:06:32CLICKING
0:06:32 > 0:06:35I'm bouncing sound waves.
0:06:35 > 0:06:40Beep, beep, beep, beep!
0:06:43 > 0:06:47Messy, if you're not careful, you're going to hit the...
0:06:47 > 0:06:49Oh! Booster button!
0:06:49 > 0:06:53- Ah!- Told you anyone can press a button.
0:06:58 > 0:07:00Oh, sorry.
0:07:00 > 0:07:01CLICKING
0:07:01 > 0:07:04Is that where your cave is?
0:07:05 > 0:07:07Wa-hey, we found the way. Oki-tastic!
0:07:15 > 0:07:18Careful!
0:07:22 > 0:07:24Oh, we're there.
0:07:27 > 0:07:29Let's Oki-go!
0:07:32 > 0:07:34Wow!
0:07:36 > 0:07:39Hey, little bat, where are you?
0:07:40 > 0:07:42- ECHO:- 'Where are you?'
0:07:44 > 0:07:45Who's there?
0:07:45 > 0:07:47- ECHO:- 'Who's there?'
0:07:47 > 0:07:49Hey, it did follow us here after all.
0:07:49 > 0:07:53- Who did?- The invisible person in my garden.
0:07:53 > 0:07:55- He's in the cave, now.- Come on.
0:07:55 > 0:07:59It's time we found this invisible person.
0:07:59 > 0:08:01Hello!
0:08:01 > 0:08:03ECHO: 'Hello.'
0:08:03 > 0:08:04See?
0:08:04 > 0:08:06Who is it?
0:08:06 > 0:08:08- ECHO:- 'Who is it?'
0:08:08 > 0:08:11Did you hear that? It said what I said.
0:08:11 > 0:08:13Listen.
0:08:13 > 0:08:15I'm Felix.
0:08:15 > 0:08:16- ECHO:- 'I'm Felix.'
0:08:16 > 0:08:20I think that's my sound waves bouncing back to me.
0:08:20 > 0:08:23I think what you heard was an echo.
0:08:23 > 0:08:25- ECHO:- '..was an echo.'
0:08:25 > 0:08:27Like the echoes the bat made.
0:08:27 > 0:08:29Wow! Balabalaboomboom!
0:08:29 > 0:08:33'Balabalaboomboom!'
0:08:36 > 0:08:40Ah, there you are, little bat.
0:08:41 > 0:08:45Hi, Zoe. You'd all better get back to the cloud ship quickly.
0:08:45 > 0:08:49- We have a problem.- Come on. We'd better hurry.
0:08:51 > 0:08:56- What is it?- It's the Okido sneaky furry fog.
0:08:56 > 0:09:00It appears out of nowhere. When you least expect it.
0:09:00 > 0:09:02It's impossible to fly through.
0:09:02 > 0:09:06- We could be here for days.- For days?
0:09:06 > 0:09:11But there aren't any socks here. What will we eat?
0:09:11 > 0:09:15Wait a minute. Maybe the bat can help us.
0:09:15 > 0:09:18- How?- Oh, yes.
0:09:18 > 0:09:22It could use its echoes to guide us through the cloud.
0:09:22 > 0:09:25Could you do that, bat? BAT SQUEAKS
0:09:34 > 0:09:36OK, let's go.
0:09:47 > 0:09:49BAT SQUEAKS
0:09:49 > 0:09:55Go right, Sam. Steady. Little bit more.
0:09:55 > 0:09:58And keep it going.
0:09:58 > 0:09:59Just a little bit more.
0:10:01 > 0:10:06The bat got us through Okido sneaky furry fog.
0:10:06 > 0:10:07- ALL:- Hurray!
0:10:07 > 0:10:09Thank you, little bat.
0:10:13 > 0:10:18Oh, wow. What an adventure. Time for bed.
0:10:18 > 0:10:24Oh, me too, but first there's something I have to try out. Bye.
0:10:24 > 0:10:26- Bye, Messy.- Bye, Messy.
0:10:29 > 0:10:33So, it wasn't an invisible person after all.
0:10:33 > 0:10:35Balabalaboomboom!
0:10:35 > 0:10:37'Balabalaboomboom!'
0:10:37 > 0:10:40Hee-hee-hee! It's my echo.
0:10:40 > 0:10:41Balabalaboomboom!