0:00:02 > 0:00:05And one more for when that lot's finished.
0:00:05 > 0:00:06- Aww.- Yes, Ms Hucklebuck.
0:00:06 > 0:00:08Toodle-pip!
0:00:08 > 0:00:10Argh! I don't know how you do this work, Colin.
0:00:10 > 0:00:13It's so boring!
0:00:13 > 0:00:15Hey, everybody, look what I got!
0:00:15 > 0:00:17Oh, you're going to love this!
0:00:17 > 0:00:20There's no need to be scared, Dr Knowles.
0:00:20 > 0:00:21They're only little mice.
0:00:21 > 0:00:23It's not the mice that's the problem,
0:00:23 > 0:00:25it's the panpipes!
0:00:25 > 0:00:27I hate panpipes!
0:00:27 > 0:00:30PANPIPES PLAY, MICE SHOUT IN SPANISH
0:00:30 > 0:00:31BELL RINGS
0:00:31 > 0:00:34Going live in five, everyone!
0:00:38 > 0:00:39With...
0:00:44 > 0:00:46..the floor manager and...
0:00:49 > 0:00:51Stand by!
0:00:51 > 0:00:52Come on, everybody!
0:00:55 > 0:00:56- BOTH:- It's time for...
0:01:00 > 0:01:03Today we're asking, why do cats purr?
0:01:03 > 0:01:05There are two types of cats - those that purr
0:01:05 > 0:01:07and those that roar.
0:01:07 > 0:01:08Meow!
0:01:08 > 0:01:11The ones that roar generally belong to the larger species of cat,
0:01:11 > 0:01:13such as lions,
0:01:13 > 0:01:14tigers,
0:01:14 > 0:01:15leopards
0:01:15 > 0:01:17and jaguars.
0:01:17 > 0:01:20- Oh, my! - Those that purr include pumas,
0:01:20 > 0:01:21lynxes,
0:01:21 > 0:01:22cheetahs,
0:01:22 > 0:01:23bobcats
0:01:23 > 0:01:26and of course our own domestic cats.
0:01:26 > 0:01:28Meow!
0:01:28 > 0:01:29But how do they do it, Doctor?
0:01:29 > 0:01:31Most scientists believe that purring begins
0:01:31 > 0:01:34in a cat's brain which sends a signal
0:01:34 > 0:01:36to muscles in the voice box to vibrate.
0:01:36 > 0:01:39These muscles act like a valve by opening and closing
0:01:39 > 0:01:41the space between the vocal cords,
0:01:41 > 0:01:44allowing air to flow through the cat's voice box.
0:01:44 > 0:01:47Hey, Dr Knowles, how does a kitten learn to purr?
0:01:47 > 0:01:49Purr-actice?
0:01:50 > 0:01:51Do you get it?
0:01:51 > 0:01:53Ha. Good one, Professor.
0:01:53 > 0:01:55See you after the break!
0:01:56 > 0:01:58And we're clear!
0:01:59 > 0:02:02I mean, this isn't even part of my job.
0:02:02 > 0:02:05Oh, this day couldn't get any worse!
0:02:06 > 0:02:07Oh, no! Not these guys again!
0:02:07 > 0:02:10PANPIPES PLAY: Shake It Off by Taylor Swift
0:02:10 > 0:02:12McCork, sort this mess out!
0:02:14 > 0:02:17Ah, there they are! They keep escaping on me.
0:02:17 > 0:02:19Argh! Panpipes!
0:02:19 > 0:02:20Come here!
0:02:21 > 0:02:24SHE SOBS
0:02:24 > 0:02:25BELL RINGS
0:02:25 > 0:02:27Positions, everybody!
0:02:32 > 0:02:35So, Dr Knowles, why do cats purr?
0:02:35 > 0:02:38Cats usually purr when they're happy and content,
0:02:38 > 0:02:39like when they are resting,
0:02:39 > 0:02:41when they come into contact with people
0:02:41 > 0:02:43and when they're eating.
0:02:43 > 0:02:46But what does the purring do anyway, Doctor?
0:02:46 > 0:02:48Well, there are a number of interesting theories.
0:02:48 > 0:02:52One suggests that it helps mother cats bond with their kittens.
0:02:52 > 0:02:53Aww!
0:02:53 > 0:02:56And it is also thought that purring may improve the cat's health.
0:02:56 > 0:02:58Really? How so?
0:02:58 > 0:03:01Some studies suggest that the purring sound occurs
0:03:01 > 0:03:05at a frequency that helps to improve bone density and healing.
0:03:05 > 0:03:08Ha, what a purr-fect system!
0:03:08 > 0:03:09Do you get it, Dr Knowles?
0:03:09 > 0:03:11- Argh.- A purr-fect system!
0:03:11 > 0:03:13Ha-ha-ha-ha!
0:03:13 > 0:03:14See you later, Brain Freezers!
0:03:19 > 0:03:23- Ah.- Finally all done. Phew!
0:03:23 > 0:03:25And one more. Ciao!
0:03:25 > 0:03:26What?!
0:03:26 > 0:03:28- But...- Hola!
0:03:28 > 0:03:31PANPIPES PLAY: Shake It Off by Taylor Swift
0:03:31 > 0:03:33I'm losing my mind!
0:03:33 > 0:03:37Oh, McCork, panpipes - my favourite!
0:03:37 > 0:03:39How did you know?
0:03:39 > 0:03:41I had a hunch, Mrs Hucklepipes.
0:03:45 > 0:03:48I think we'll have to have panpipes every day from now on.
0:03:48 > 0:03:50DOCTOR KNOWLES GROANS