0:00:02 > 0:00:03BELL RINGS
0:00:03 > 0:00:04Quick! Hide!
0:00:04 > 0:00:07Eight, nine, ten!
0:00:07 > 0:00:09Ready or not, here I come!
0:00:11 > 0:00:14- Move over, will you? You're in the way.- I was here first.
0:00:14 > 0:00:18- Where are you? - She's going to see us!- Ssh!
0:00:18 > 0:00:20Crumpets! We're done for!
0:00:20 > 0:00:24- Come out, come out, wherever you are...- Oh, no...
0:00:24 > 0:00:25BELL RINGS
0:00:25 > 0:00:30Aha! Game suspended! We're live in five, four, three...
0:00:30 > 0:00:33This is Brain Freeze!
0:00:33 > 0:00:34With Dr Knowles...
0:00:35 > 0:00:37..Professor McCork...
0:00:37 > 0:00:38BUZZING
0:00:38 > 0:00:40..Colin, the floor manager...
0:00:41 > 0:00:43..and Ms Hucklebuck.
0:00:43 > 0:00:45Stand by!
0:00:45 > 0:00:47Come on, everybody!
0:00:50 > 0:00:51- BOTH:- It's time for...
0:00:54 > 0:00:56Today we're asking...
0:00:58 > 0:01:02In nature, animals and plants use camouflage to appear invisible.
0:01:02 > 0:01:04Some animals use their colour and texture to blend in
0:01:04 > 0:01:08with their environment, which can help when stalking prey.
0:01:08 > 0:01:10Roar!
0:01:10 > 0:01:11Others have distinctive patterns
0:01:11 > 0:01:14which act as visual disruptions to confuse predators.
0:01:19 > 0:01:20And then there are animals
0:01:20 > 0:01:23who use mimicry to make themselves invisible.
0:01:23 > 0:01:25Mimicry? I love a good impression!
0:01:25 > 0:01:28One such animal is the walking stick insect,
0:01:28 > 0:01:29which looks just like a twig.
0:01:32 > 0:01:34Amazing. That gives me an idea.
0:01:34 > 0:01:38Ms Hucklebuck, I bet you can't find me!
0:01:38 > 0:01:39SHE GROANS
0:01:39 > 0:01:40See you after the break.
0:01:40 > 0:01:43And we're clear!
0:01:43 > 0:01:46Heh! This is the best hiding place ever.
0:01:46 > 0:01:49I wonder where McCork could be.
0:01:49 > 0:01:53She hasn't a hope of finding me in here!
0:01:53 > 0:01:56I can see you, McCork!
0:01:56 > 0:02:00Ha! As if! I'm completely invisible.
0:02:00 > 0:02:02No, I really can see you, McCork.
0:02:02 > 0:02:05You're standing right in front of me.
0:02:05 > 0:02:07Ah, crumpets! Caught again!
0:02:07 > 0:02:10Are you sure you don't want me to explain the rules again, McCork?
0:02:10 > 0:02:11It's really quite simple.
0:02:11 > 0:02:13BELL RINGS
0:02:13 > 0:02:15Oh! Positions, everyone!
0:02:15 > 0:02:18Argh! How do you do that, Dr Knowles?
0:02:23 > 0:02:27So, Dr Knowles, which animal can turn invisible?
0:02:27 > 0:02:30In the deep sea there are squid, cuttlefish and octopuses
0:02:30 > 0:02:33who can change their shape, colour,
0:02:33 > 0:02:36pattern and texture of their skin in an instant.
0:02:36 > 0:02:38What? How do they do that?
0:02:38 > 0:02:41Octopuses have special pigment cells in their skin
0:02:41 > 0:02:44called chromophores. By controlling the size of these cells,
0:02:44 > 0:02:46they can vary their colour
0:02:46 > 0:02:49and even create changing patterns.
0:02:49 > 0:02:50The mimic octopus goes even further
0:02:50 > 0:02:51by changing colour
0:02:51 > 0:02:53and moving its tentacles
0:02:53 > 0:02:56to take on the appearance of other sea creatures.
0:02:56 > 0:02:58There's no catching that fella!
0:02:58 > 0:02:59So there you have it -
0:02:59 > 0:03:03the octopus is widely considered to be the master of camouflage.
0:03:03 > 0:03:06Which is also what they call me, funnily enough.
0:03:06 > 0:03:07See you next time.
0:03:07 > 0:03:10Agh! Who did that? Where am I?
0:03:12 > 0:03:16I figured it out this time, lads, I know what I'm doing.
0:03:16 > 0:03:18Ready or not, here I come!
0:03:20 > 0:03:24I hope we haven't made it too easy for him.
0:03:24 > 0:03:27Well, he is really, really bad at hide and seek, Ms Hucklebuck.
0:03:27 > 0:03:30Anyone in here? Hello?
0:03:30 > 0:03:32Ow! My head!
0:03:32 > 0:03:34This is fun. It's really sore but it's fun.
0:03:34 > 0:03:37Oh, dear. Do you think we should stop him?
0:03:37 > 0:03:39No, let's let him tire himself out.
0:03:39 > 0:03:41It's nearly time for his nap anyway.
0:03:41 > 0:03:44Am I getting hotter or cold...? Ow!
0:03:44 > 0:03:46Oh... Whoa!
0:03:47 > 0:03:49Whoa-oh!
0:03:49 > 0:03:53OK, so I have my eyes open and you have to try and find me.
0:03:53 > 0:03:56- No, you're it.- It, what's it?
0:03:56 > 0:03:57YOU'RE it.
0:03:57 > 0:03:59- Who's it?- You are!
0:03:59 > 0:04:01Oh, I am? Oh, now I understand.
0:04:01 > 0:04:03Brain Freeze!