0:00:02 > 0:00:05'Today on Roar, when it's dinner time on the savannah,
0:00:05 > 0:00:07'there's nothing the lions like better
0:00:07 > 0:00:09'than a nice chewy cape buffalo.
0:00:10 > 0:00:14'So, when the park's lions spot this pair of cape buffalo,
0:00:14 > 0:00:17'will they go in for the kill?'
0:00:42 > 0:00:44Hello. Welcome to Roar.
0:00:44 > 0:00:46I'm Rani and the bloke with the glow on,
0:00:46 > 0:00:48that's Johny. Doing OK, Johny?
0:00:48 > 0:00:51I'm doing well, Rani. The reason I've got a bit of a glow on
0:00:51 > 0:00:52is because I'm working on my jab.
0:00:52 > 0:00:54We've got an incredibly hot show for you.
0:00:54 > 0:00:57We'll be playing around with this. A thermal imaging camera.
0:00:57 > 0:01:01We're going to figure out what's hot and what's not on the park.
0:01:01 > 0:01:03Really? Am I hot, Rani?
0:01:03 > 0:01:05Erm, absolutely not, Johny.
0:01:05 > 0:01:08Let's get on with the show.
0:01:08 > 0:01:11I'm not playing this anymore.
0:01:13 > 0:01:17'Coming up today, we'll discover all about the thermal imaging camera,
0:01:17 > 0:01:21'where the keepers use it to reveal the animals' secrets.'
0:01:21 > 0:01:24'The Ask The Keeper kids are going to find out
0:01:24 > 0:01:28'if the giant tegu is as mean as he looks, or just a big pussycat.'
0:01:30 > 0:01:33'Down in the bat cave, we'll see the difference between
0:01:33 > 0:01:37'the harvest fruit eaters and the blood-sucking vampires.'
0:01:51 > 0:01:52Myself and Johny, we're out here
0:01:52 > 0:01:55and we are looking for the elusive cape buffalo.
0:01:55 > 0:01:58- Any luck, Johny? - No sign of them yet, Rani.
0:01:58 > 0:02:01- Oh, no, wait, there they are. - Have you found something?- Yeah.
0:02:01 > 0:02:04Hang on, let me have a look.
0:02:04 > 0:02:08Oh, hang on a minute, they're not cape buffalo.
0:02:08 > 0:02:12That's deputy head of big cats. Bob, how are you doing?
0:02:12 > 0:02:13Look, I'm no expert, Bob,
0:02:13 > 0:02:15but they're not cape buffalo, are they?
0:02:15 > 0:02:19No, they're the elusive cape boxes, I think.
0:02:19 > 0:02:21So, that's what they're made of, bits of boxes and stuff?
0:02:21 > 0:02:24It's just cardboard boxes.
0:02:24 > 0:02:28- And it won't harm the lions? - No, nothing will harm them at all.
0:02:28 > 0:02:31We are in the lion enclosure.
0:02:31 > 0:02:33The lions are back there behind the fence.
0:02:33 > 0:02:37Why are these cape buffalo here? They don't need walking.
0:02:37 > 0:02:38It's to do with enrichment.
0:02:38 > 0:02:41If you put something strange in their section,
0:02:41 > 0:02:43they'll focus on it. Curiosity will take over
0:02:43 > 0:02:47and hopefully they'll come over and hunt them.
0:02:47 > 0:02:49They would hunt cape buffalo in the wild.
0:02:49 > 0:02:53Once again, I'm no expert, but I imagine cape buffalo in real life
0:02:53 > 0:02:55are quite a bit bigger than these guys.
0:02:55 > 0:02:56Much bigger, yeah.
0:02:56 > 0:03:00Will the lions think they are prey, or will they know it's a bit of fun
0:03:00 > 0:03:02and something for them to tear to shreds?
0:03:02 > 0:03:05They'll know it's just a bit of fun.
0:03:05 > 0:03:07Cos it's something strange.
0:03:07 > 0:03:10They'll come up here and, I expect you'll see what they do.
0:03:10 > 0:03:13Do you think they'll go for the weak spots of the animal,
0:03:13 > 0:03:15so to speak?
0:03:15 > 0:03:16Will they go for the legs
0:03:16 > 0:03:18like they would in the wild? Or maybe the neck?
0:03:18 > 0:03:20I should imagine with these,
0:03:20 > 0:03:23as the lions are probably bigger than they are anyway,
0:03:23 > 0:03:25they'll just pile them over.
0:03:25 > 0:03:28But in the wild, they'd go for the calf, which is this one here.
0:03:28 > 0:03:30It's obviously going to be more vulnerable.
0:03:30 > 0:03:33Being cape buffalo, they are quite a foe.
0:03:33 > 0:03:35They wouldn't give in easily.
0:03:35 > 0:03:39They would fight them. It would be a struggle to get them.
0:03:39 > 0:03:42Join us a little later in the show to find out what this pride of lions
0:03:42 > 0:03:45make of our cape buffalo and how long they last.
0:03:53 > 0:03:56'It's not easy looking after all these unusual animals.
0:03:56 > 0:03:59'So it's very important for the keepers to find out
0:03:59 > 0:04:01'as much as they can about the different species.
0:04:01 > 0:04:03'Because the more they know,
0:04:03 > 0:04:07'the better they can care for their creatures.
0:04:07 > 0:04:10'And, here on Roar, we like to help.
0:04:10 > 0:04:13'So, when we got hold of a thermal imaging camera,
0:04:13 > 0:04:17'we sent it straight over to the deputy head warden, Ian Turner.'
0:04:17 > 0:04:22We've got a new toy. A thermal imaging camera.
0:04:22 > 0:04:25'A thermal imaging camera sees temperatures
0:04:25 > 0:04:27'and records them as different colours.
0:04:27 > 0:04:30'So the cold areas show up as blues and greens,
0:04:30 > 0:04:32'while the warmer parts are yellow and red,
0:04:32 > 0:04:34'And the hot bits are white.'
0:04:34 > 0:04:36I'm going to test it on a few animals in the park
0:04:36 > 0:04:38and tell the difference
0:04:38 > 0:04:40between warm-blooded and cold-blooded animals.
0:04:40 > 0:04:44Hopefully, it'll be really interesting for the keepers to see.
0:04:44 > 0:04:47# You're hot then you're cold You're yes then you're no
0:04:47 > 0:04:50# You're in then you're out You're up then you're down... #
0:04:50 > 0:04:53'First stop are the vultures.
0:04:56 > 0:04:59'They've just been fed, and it's not a pretty sight.
0:04:59 > 0:05:02'But what will the thermal image show?
0:05:02 > 0:05:05'Mark Tyre's the keeper in charge of the vultures,
0:05:05 > 0:05:08'so he's taking a look at the playback with Ian.'
0:05:09 > 0:05:11- There you go.- Brilliant.
0:05:11 > 0:05:13The head is completely white.
0:05:13 > 0:05:16There's no feathers there. That's where all the heat is.
0:05:16 > 0:05:19It goes to show what fantastic insulators feathers are.
0:05:19 > 0:05:25# She's a hot head Hot head, hot head... #
0:05:25 > 0:05:29'The vultures' feathers keep their body heat inside like a coat.
0:05:29 > 0:05:32'But on their head and neck they don't have feathers,
0:05:32 > 0:05:36'so their heat can escape from those parts.
0:05:36 > 0:05:40'And that's the heat which the camera's showing as white.
0:05:40 > 0:05:42'Now, there's a rather gruesome reason
0:05:42 > 0:05:45'why vultures don't have feathers there.'
0:05:45 > 0:05:46They need a bald neck
0:05:46 > 0:05:50to get into carcasses so they don't get all matted up in mess and blood.
0:05:50 > 0:05:52It's easier for them to clean off.
0:05:52 > 0:05:55If that was in feathers, it would just stay there all matted up.
0:05:55 > 0:05:57- Which makes sense.- Yeah.
0:05:57 > 0:05:59# You're as cold as ice
0:05:59 > 0:06:02# You're willing to sacrifice... #
0:06:02 > 0:06:06'Mark also looks after the Californian sea lions.
0:06:08 > 0:06:10'To cope with living in the cold ocean,
0:06:10 > 0:06:13'they have fantastic insulation, a fur coat on the outside,
0:06:13 > 0:06:16'which is all slicked down, and, just below the skin,
0:06:16 > 0:06:19'they have a layer of fat called blubber.'
0:06:21 > 0:06:23The blubber is two inches thick.
0:06:23 > 0:06:28So that must be a fairly good insulator for the internal body.
0:06:28 > 0:06:31'With all that insulation keeping the heat inside,
0:06:31 > 0:06:34'the outside of the sea lions is showing up as very cold,
0:06:34 > 0:06:36'except when they open their mouths.'
0:06:38 > 0:06:39That's Buster in the water.
0:06:39 > 0:06:42That's when he was shouting with his mouth open.
0:06:42 > 0:06:45Can see right down his mouth, how it must be warm inside there, see.
0:06:47 > 0:06:51'On the inside, sea lions are the same temperature as us,
0:06:51 > 0:06:52'about 37 degrees centigrade.
0:06:52 > 0:06:55'But the thermal imaging camera is reading their outsides
0:06:55 > 0:06:58'at about 17 degrees. You can see the difference
0:06:58 > 0:07:01'when Mark goes to give Buster a fish.
0:07:06 > 0:07:10'But now the sea lions are off, and Ian is on his way
0:07:10 > 0:07:13'to find the answer to a mystery about the zebras.
0:07:13 > 0:07:15'We'll catch up with him later.'
0:07:27 > 0:07:29Earlier on in the show,
0:07:29 > 0:07:32we placed some very life-like cape buffalo
0:07:32 > 0:07:35into the lions' enclosure. And I have to say life-like
0:07:35 > 0:07:38because it's Bob's cape buffalo, and his lions as well.
0:07:38 > 0:07:41With these lions, is there one that's more aggressive
0:07:41 > 0:07:43who might come over first?
0:07:43 > 0:07:46There are aggressive ones and inquisitive ones.
0:07:46 > 0:07:49But I think Sweet Pea or Mildred will be the first ones up.
0:07:49 > 0:07:52And can you recognise them just by looking at them?
0:07:52 > 0:07:54Oh, yeah. I'll let you know which one's which.
0:07:54 > 0:07:56- Wicked.- All right then.
0:07:56 > 0:07:59All we need to do now is release the lions
0:07:59 > 0:08:01and let's see what they make of the cape buffalo.
0:08:01 > 0:08:04Are you going to do that, please?
0:08:04 > 0:08:05- I will.- All right, Bob.
0:08:05 > 0:08:07All right!
0:08:10 > 0:08:12They're all coming over together.
0:08:12 > 0:08:14- They're mounting each other. - Wow! That's incredible.
0:08:14 > 0:08:18- They are fighting each other to get over.- That's Sweet Pea coming up.
0:08:18 > 0:08:20Is it?
0:08:20 > 0:08:22With a name like that,
0:08:22 > 0:08:24it's got to be aggressive, hasn't it?
0:08:24 > 0:08:26"Sweet Pea. Come on, Sweet Pea."
0:08:26 > 0:08:28- Oh, there you go.- Oh! - Look at that!
0:08:35 > 0:08:38- That's incredible! - Taking them down.
0:08:38 > 0:08:40- They're killed. They're dead.- Yeah?
0:08:40 > 0:08:43Who's that running away with this buffalo?
0:08:43 > 0:08:46I imagine she's doing that because she's trying to stamp her authority,
0:08:46 > 0:08:48saying "this piece is mine"!
0:08:48 > 0:08:49She's got her piece, yeah.
0:08:49 > 0:08:53She's taking it off somewhere where the others can't get to her.
0:08:53 > 0:08:57But you can see they are intrigued. They will play with it for a while.
0:08:57 > 0:08:59There's nothing there that will harm them.
0:08:59 > 0:09:02- Brilliant.- They're just going to tear it all to pieces.
0:09:02 > 0:09:04How often would they actually make a catch like this?
0:09:04 > 0:09:07They are incredible hunters.
0:09:07 > 0:09:10But, you've also got to put into the equation the prey.
0:09:10 > 0:09:12They obviously don't want to be eaten,
0:09:12 > 0:09:15so they will, effectively, make it a hard time.
0:09:15 > 0:09:19They won't hunt successfully every day.
0:09:19 > 0:09:22I've got to say, it was really interesting behaviour
0:09:22 > 0:09:24when they were running over.
0:09:24 > 0:09:25Sweet Pea was in the lead,
0:09:25 > 0:09:27but the lioness behind was grabbing her back,
0:09:27 > 0:09:28like, "Slow down!
0:09:28 > 0:09:31"I want to get to the cape buffalo first!"
0:09:31 > 0:09:32If you look at it,
0:09:32 > 0:09:35that was practising her hunting techniques as well.
0:09:35 > 0:09:38They would jump on the back of a buffalo
0:09:38 > 0:09:40to try and bring it down.
0:09:40 > 0:09:44Now, one tonne of cape buffalo, how many lions could that feed?
0:09:44 > 0:09:48It would feed anything up to about 20 lions in a good pride.
0:09:48 > 0:09:50If the food source is there,
0:09:50 > 0:09:53then obviously the pride number will go up.
0:09:53 > 0:09:56But one cape buffalo, let's say a tonne of buffalo,
0:09:56 > 0:09:58will feed about 20 animals.
0:09:58 > 0:10:01Would that last? Is that, like, a meal for a week, or something?
0:10:01 > 0:10:05No, they gorge-feed as much as they can.
0:10:05 > 0:10:09They can gorge-feed anything up to about 15 or 20 kilos at a time,
0:10:09 > 0:10:11which is a fair amount of food.
0:10:11 > 0:10:14Then they obviously go and sleep it off.
0:10:14 > 0:10:17They will need to be fed the following day
0:10:17 > 0:10:19or a couple of days afterwards.
0:10:20 > 0:10:22Bob, it's been incredible to see these lions in action.
0:10:22 > 0:10:25But they have made a right old mess of our buffalo.
0:10:25 > 0:10:29There is the small point that somebody's got to clear that up.
0:10:29 > 0:10:31- So, can we leave you to that? - Oh, cheers, mate!
0:10:31 > 0:10:34(THEY LAUGH)
0:10:37 > 0:10:39Where does a baby ape sleep?
0:10:41 > 0:10:42In ape-ri-cots!
0:10:42 > 0:10:47(GORILLA NOISES)
0:10:47 > 0:10:49What do cats eat for breakfast?
0:10:51 > 0:10:53Mice-Krispies!
0:10:55 > 0:10:59Why can't polar bears eat penguins?
0:11:00 > 0:11:03They can't get the wrappers off!
0:11:03 > 0:11:09LAUGHTER
0:11:13 > 0:11:17FUNKY MUSIC
0:11:25 > 0:11:27It's quiz time for keeper Sarah
0:11:27 > 0:11:30as she's going to be answering questions about the tegu
0:11:30 > 0:11:31in Ask The Keeper.
0:11:31 > 0:11:32Are you ready te-gu?
0:11:32 > 0:11:35- I mean "to go"!- Yep. - That was really bad, Sarah,
0:11:35 > 0:11:38I'm so sorry about that. Who have we got here, then?
0:11:38 > 0:11:41This is Diego and he's a tegu.
0:11:41 > 0:11:44- We've got a question here. - How fast can they run?
0:11:44 > 0:11:47About ten miles an hour. Cos they're quite big and heavy.
0:11:47 > 0:11:49But if he really needed to get somewhere,
0:11:49 > 0:11:51he'd run pretty fast, I think.
0:11:51 > 0:11:57Does he eat anything apart from, like, plants and stuff?
0:11:57 > 0:12:00Yeah, tegus eat a lot of different things.
0:12:00 > 0:12:02they eat eggs and bugs and small mammals and birds,
0:12:02 > 0:12:04plants, fruits.
0:12:04 > 0:12:06Even they've been known to eat fish, as well.
0:12:06 > 0:12:10They'll try and eat anything they can get their teeth round.
0:12:10 > 0:12:11OK. Martha, have you got a question?
0:12:11 > 0:12:13How long do they live?
0:12:13 > 0:12:17They can live up to about 15 years in captivity.
0:12:17 > 0:12:19If they're looked after properly.
0:12:19 > 0:12:22I've noticed he's got this huge tongue.
0:12:22 > 0:12:25Is he tasting the air when he puts his tongue out?
0:12:25 > 0:12:28Similar to snakes, yeah. They flick their tongue out
0:12:28 > 0:12:30and smell their environment with their tongue.
0:12:30 > 0:12:32Yeah, the same principle as snakes.
0:12:32 > 0:12:35He's picking up all the different smells around him.
0:12:35 > 0:12:38- Checking if there's any danger? - Yeah, just exploring things.
0:12:38 > 0:12:39Are they poisonous?
0:12:39 > 0:12:42No, they're not poisonous at all, these, no.
0:12:42 > 0:12:43I've got a question.
0:12:43 > 0:12:45With a name like Diego, where's he from?
0:12:45 > 0:12:48He comes from Argentina mainly,
0:12:48 > 0:12:51and Brazil and Uruguay.
0:12:51 > 0:12:52Big part of South America.
0:12:52 > 0:12:54Guys, Sarah's making this look easy.
0:12:54 > 0:12:57Leslie, have you got a tough question?
0:12:57 > 0:12:58Do they bite?
0:12:58 > 0:13:02With a lot of animals, there is always the possibility of them biting
0:13:02 > 0:13:04if they're frightened and not used to people.
0:13:04 > 0:13:06But as you can see, Diego's very used to people now.
0:13:06 > 0:13:09So, he's a very friendly tegu. He wouldn't bite anyone.
0:13:09 > 0:13:12Sarah, if Diego's so friendly, can we have a bit of a touch?
0:13:12 > 0:13:14- Yeah.- Will that be all right?
0:13:14 > 0:13:16Of course, go for it.
0:13:21 > 0:13:22What does it feel like, guys?
0:13:22 > 0:13:24It feels like a snake.
0:13:24 > 0:13:26Does it? Can I touch it?
0:13:26 > 0:13:30I'm touching this big sack, here. What's that all about? This bit?
0:13:30 > 0:13:32That's what the boys have.
0:13:32 > 0:13:34It's just to make them look big and impressive to show off
0:13:34 > 0:13:37to the girls. Girls don't have these bits.
0:13:37 > 0:13:39Is it like when a lad goes to the gym to get muscles
0:13:39 > 0:13:42- to attract all the girls?- Yeah, that's exactly what it is, yeah.
0:13:42 > 0:13:44Sarah, you've done well so far.
0:13:44 > 0:13:46But, to be honest, this is boring, guys.
0:13:46 > 0:13:48She's answering all our questions.
0:13:48 > 0:13:50I think we need to get on to the killer question.
0:13:52 > 0:13:54Come on in, guys. Help me out here. Right. OK.
0:13:54 > 0:13:56WHISPERING
0:13:56 > 0:14:00'Hmm, I'm thinking, Diego is a Spanish name.
0:14:00 > 0:14:02'That's the language they speak in Argentina
0:14:02 > 0:14:04'where these tegus come from.
0:14:04 > 0:14:07'So, I wonder...'
0:14:07 > 0:14:10OK. It's Killer Question time.
0:14:10 > 0:14:13We think we've got you with this one, Sarah.
0:14:13 > 0:14:16Out of a few killer questions that we've done,
0:14:16 > 0:14:17this is a really difficult one.
0:14:17 > 0:14:21Sarah, if a tegu was to say
0:14:21 > 0:14:23"tengo hambre" to you,
0:14:23 > 0:14:26that's Spanish, what would he be meaning?
0:14:26 > 0:14:28Obviously Spanish because he's Argentinean.
0:14:28 > 0:14:31What would he be saying? "Tengo hambre."
0:14:31 > 0:14:34I'm going to guess, because I've no idea,
0:14:34 > 0:14:37I don't speak Spanish, but I'm going to guess
0:14:37 > 0:14:39"I'm hungry". Something to do with feeding.
0:14:41 > 0:14:44You're right. How did you get that one right? That's unbelievable.
0:14:44 > 0:14:47- Seriously?!- Yeah.
0:14:47 > 0:14:49Round of applause for Sarah, guys.
0:14:49 > 0:14:51Sarah, I'm flabbergasted.
0:14:51 > 0:14:53What do you think, guys? Did she do well today?
0:14:53 > 0:14:54ALL: Yeah.
0:14:54 > 0:14:56Overall, a thumbs up or thumbs down?
0:14:56 > 0:14:58ALL: Thumbs up.
0:14:58 > 0:15:00Sarah, estupendo! That's Spanish for great.
0:15:09 > 0:15:12'Back with Ian Turner. He's now up in the East Africa reserve,
0:15:12 > 0:15:15'trying to get a new angle on an age-old question.'
0:15:15 > 0:15:18'Why do zebras have stripes?
0:15:22 > 0:15:24'Maybe the thermal imaging camera will help decide.
0:15:24 > 0:15:29'But Ian's having trouble, because they just won't stand still.'
0:15:29 > 0:15:31Hate working with animals.
0:15:31 > 0:15:34'But eventually they stop for a breather.
0:15:35 > 0:15:40'And now, you can just about see some of their stripes.
0:15:40 > 0:15:43'This is because dark colours like black absorb heat,
0:15:43 > 0:15:47'so are warmer than the white bits, which reflect heat.'
0:15:47 > 0:15:50One theory is that the stripes are for heat regulation,
0:15:50 > 0:15:54to stop them getting too hot. Black absorbs and white reflects.
0:15:54 > 0:15:57There are lots of other theories. One is it keeps flies away.
0:15:57 > 0:16:00Another is, if you've a mass of zebras together,
0:16:00 > 0:16:04the black and white stripes in the heat makes them hazy
0:16:04 > 0:16:06so a lion can see zebras,
0:16:06 > 0:16:09but it can't pick out the individual zebra it wants to attack
0:16:09 > 0:16:11which makes it better for them to stay in large groups
0:16:11 > 0:16:14which is why zebras are in major groups.
0:16:14 > 0:16:18# Feeling hot, hot, hot... #
0:16:18 > 0:16:23'The zebras aren't the only animal here with very distinctive markings.
0:16:23 > 0:16:26'What will the camera reveal about the giraffes?
0:16:26 > 0:16:28'The keeper in charge of looking after them
0:16:28 > 0:16:31'is Andy Hayton, and he's keen to check it out.
0:16:33 > 0:16:34It's quite cool, actually.
0:16:34 > 0:16:38You can actually see the difference in temperature on the pattern.
0:16:38 > 0:16:39Obviously the darker spots are warmer.
0:16:39 > 0:16:42The pattern on the coat is to do with light and dark.
0:16:42 > 0:16:45Dark attracts more heat. Light repels heat.
0:16:46 > 0:16:49A lot of camouflage is to break up an outline.
0:16:49 > 0:16:51If you've a giraffe in fairly thick bush,
0:16:51 > 0:16:54if something's coming after it looking for a meal,
0:16:54 > 0:16:57the patterning will break them up and you won't be able
0:16:57 > 0:17:01to see the giraffe quite as clearly if you're a predator.
0:17:01 > 0:17:05'The thermal camera also reveals a very clear white line
0:17:05 > 0:17:07'in the giraffe's hooves,
0:17:07 > 0:17:09'which shows it's hotter than the rest.
0:17:09 > 0:17:12'This is because their hooves never stop growing,
0:17:12 > 0:17:16'so they need a constant supply of nice warm blood.'
0:17:16 > 0:17:19Where the hoof and the leg join, it's called the coronet band.
0:17:19 > 0:17:21That's where the growth comes from
0:17:21 > 0:17:24for the hoof to grow down from there.
0:17:24 > 0:17:26We can see a real clear-cut, defined line in the coronet band.
0:17:26 > 0:17:29There's obviously a really good blood supply,
0:17:29 > 0:17:33allowing the hoof to grow down. That's quite interesting to see.
0:17:37 > 0:17:38This is quite a cool toy to play with.
0:17:38 > 0:17:41You could look at all sorts with this.
0:17:41 > 0:17:45'But Ian still has more animals to investigate.
0:17:45 > 0:17:49'Including the hottest and the coolest guys in the place.
0:17:49 > 0:17:51'So don't go away.'
0:17:55 > 0:17:57'Calling all gamers,
0:17:57 > 0:18:00'stand by to make a note of today's cheat code
0:18:00 > 0:18:02'for the Roar game on the CBBC website.
0:18:02 > 0:18:05'It's...
0:18:07 > 0:18:09'If you haven't tried our game yet,
0:18:09 > 0:18:11'why not give it a go?
0:18:11 > 0:18:13'It's easy to get started
0:18:13 > 0:18:14'and great fun.'
0:18:36 > 0:18:37Here in the butterfly house,
0:18:37 > 0:18:40there are 30 different species of butterflies
0:18:40 > 0:18:42and even more types of plants.
0:18:42 > 0:18:44So, how does each butterfly decide
0:18:44 > 0:18:45what to have for its tea?
0:18:45 > 0:18:48- Well, I'm here with keeper Kim. Hiya, Kim.- Hiya.
0:18:48 > 0:18:51To find out exactly which butterfly chooses what to eat.
0:18:51 > 0:18:54Or do they just choose anything?
0:18:54 > 0:18:55No, it's quite technical.
0:18:55 > 0:18:58There are certain plants for certain butterflies,
0:18:58 > 0:19:00It's not always the same plant.
0:19:00 > 0:19:01But, we've got some tools here
0:19:01 > 0:19:04to help us try and attract a few of the butterflies.
0:19:04 > 0:19:07- I like!- It will explain a bit easier how they find them.
0:19:07 > 0:19:10There's plenty flying around. So if I give these to you.
0:19:10 > 0:19:13So what are these? Obviously you've made some fake flowers.
0:19:13 > 0:19:17Yeah. There are replicas of some of the flowers that are in here.
0:19:17 > 0:19:19- So if I give you those ones.- Right.
0:19:22 > 0:19:25'Don't tell Kim, but I'm not sure the butterflies
0:19:25 > 0:19:27'are going to fall for our fake flowers.
0:19:27 > 0:19:30'They seem to be quite busy with the real ones.'
0:19:36 > 0:19:38This is a swallowtail, just here.
0:19:38 > 0:19:40It's beautiful! Hey, darling.
0:19:40 > 0:19:42You can see her drinking the nectar from the flowers.
0:19:42 > 0:19:44How do they actually drink the nectar?
0:19:44 > 0:19:46They've got a really long tongue,
0:19:46 > 0:19:49kind of a nose/tongue type of thing, called a proboscis.
0:19:49 > 0:19:52- It is basically like a straw. - They suck up the nectar.
0:19:52 > 0:19:55They stick it in the middle of the flowers
0:19:55 > 0:19:58and they suck up the nectar. Then they fly off to the next plant.
0:19:59 > 0:20:02You know here, it looks like they've got loads of eyes,
0:20:02 > 0:20:03but they haven't, have they?
0:20:03 > 0:20:04That is a myth, isn't it?
0:20:04 > 0:20:07Yeah. They've two eyes. One either side.
0:20:07 > 0:20:10But each eye is made up of lots of tiny little screens, almost.
0:20:10 > 0:20:14So they can see lots of different areas. A bit like a fly's eye,
0:20:14 > 0:20:17they say they can see in slow motion and things like that.
0:20:17 > 0:20:20These guys use their eyes to see almost all around them
0:20:20 > 0:20:22so they can see where the flowers are.
0:20:28 > 0:20:30Well, I've got to say, Kim, even with that great eyesight,
0:20:30 > 0:20:33they haven't been able to spot my flowers.
0:20:33 > 0:20:35Should we walk around the butterfly house
0:20:35 > 0:20:37and see if we can attract more butterflies?
0:20:37 > 0:20:39- We could do, couldn't we?- Come on.
0:20:39 > 0:20:42'But still no takers for our fake flowers.
0:20:42 > 0:20:44'Those butterflies just keep fluttering by.'
0:20:59 > 0:21:02'Ian Turner is on a mission to collect new information
0:21:02 > 0:21:07'about the animals he and the other keepers look after here in the park.
0:21:07 > 0:21:10'He's using a thermal imaging camera to reveal how different animals
0:21:10 > 0:21:13'lose their body heat.
0:21:16 > 0:21:17'Now he's got to Mirashi the rhino.
0:21:17 > 0:21:20'She doesn't have a layer of blubber or a fur coat
0:21:20 > 0:21:22'to keep her body heat inside,
0:21:22 > 0:21:24'so that heat is escaping through her skin,
0:21:24 > 0:21:25'which makes it hot.'
0:21:27 > 0:21:29Hey, come and have a look.
0:21:30 > 0:21:34- So, white's really hot. - Yeah, she's quite hot, isn't she?
0:21:34 > 0:21:36'Mirashi is particularly hot
0:21:36 > 0:21:39'because she's just been having a run around.
0:21:40 > 0:21:44'But the thermal imaging camera reveals one part of her
0:21:44 > 0:21:46'that hasn't warmed up.'
0:21:46 > 0:21:50Blue is cold. And the only blue we've got on her at the moment
0:21:50 > 0:21:52is on the horn.
0:21:52 > 0:21:54There's no blood supply through the horn.
0:21:54 > 0:21:59It's just compressed hair and it grows from the root out.
0:21:59 > 0:22:03So that's why there's no heat going through the horn at all.
0:22:04 > 0:22:07'But the horns aren't the only part that's showing up as cold.
0:22:07 > 0:22:10'It looks like her ears are much colder than the rest of her.
0:22:10 > 0:22:13'And that's because they stick out.'
0:22:13 > 0:22:15See, actually, the extremities of the body,
0:22:15 > 0:22:18it's just a thin skin,
0:22:18 > 0:22:21and the air around it obviously keeping it cool.
0:22:21 > 0:22:24We can tell by actually feeling her ears.
0:22:24 > 0:22:27If it's too cold, obviously we know they're not warm enough,
0:22:27 > 0:22:31or if they're very hot, they've probably got a temperature.
0:22:31 > 0:22:33So we can just feel the ears
0:22:33 > 0:22:36and tell what sort of health state they're in.
0:22:36 > 0:22:39This is what I expected her to really look like.
0:22:39 > 0:22:42She's a lot warmer than I thought she would be.
0:22:42 > 0:22:44That's a thick skin on there.
0:22:44 > 0:22:47So we're actually getting some white heat through there.
0:22:47 > 0:22:51I was quite surprised that she's showing so warm through that skin.
0:22:51 > 0:22:54'Mirashi is hot because she's a warm-blooded animal.
0:22:54 > 0:22:57'All mammals and birds are warm-blooded.
0:22:57 > 0:23:00'They use some of their food to heat up their bodies inside.
0:23:03 > 0:23:08'But what about cold-blooded creatures like snakes and reptiles?
0:23:08 > 0:23:13'Keeper Sarah's put Diego the tegu away, and got out Ollie the python.
0:23:13 > 0:23:15It's quite interesting, isn't it?
0:23:15 > 0:23:18Because they are a completely different colour to us.
0:23:18 > 0:23:21We're all different colours because of how our body
0:23:21 > 0:23:22keeps itself warm.
0:23:22 > 0:23:24Whereas she's just one solid colour
0:23:24 > 0:23:26and she gradually changes all of it
0:23:26 > 0:23:29- as she's changing temperature. - That's right.
0:23:29 > 0:23:32'Although running around can make the skin warmer,
0:23:32 > 0:23:37'the internal temperature of most warm-blooded animals
0:23:37 > 0:23:39'stays roughly the same all the time.
0:23:39 > 0:23:43'For us, it's about 37 degrees centigrade.
0:23:43 > 0:23:47'But cold-blooded creatures just take on the temperature
0:23:47 > 0:23:49'of their surroundings.
0:23:49 > 0:23:52'To see how that works, Sarah's put Ollie the snake onto
0:23:52 > 0:23:55'a warm hot water bottle for a few minutes.
0:23:55 > 0:23:56Yeah, turn him over.
0:23:57 > 0:23:59Totally different. Look.
0:23:59 > 0:24:01Like she'd been laid down for that few minutes.
0:24:01 > 0:24:04- Yeah.- Bright yellow. Even some red spots.- Some red, yeah.
0:24:04 > 0:24:07We can move to warm ourselves up, they need heat to move.
0:24:07 > 0:24:09They need to move around their environment.
0:24:09 > 0:24:11If it gets cold and they don't move at all,
0:24:11 > 0:24:13- eventually they would die.- Yeah.
0:24:13 > 0:24:16It's really important that their environment is kept
0:24:16 > 0:24:18at a certain temperature, as well.
0:24:18 > 0:24:21Because, obviously, if they were this cold all the time,
0:24:21 > 0:24:24they wouldn't then have their energy.
0:24:24 > 0:24:27So we always make sure we have their hot end and cool end
0:24:27 > 0:24:29so they can find their own preference, then.
0:24:29 > 0:24:30But to digest their food,
0:24:30 > 0:24:34they need to be kept at a certain temperature all the time,
0:24:34 > 0:24:37otherwise they can't digest their food properly.
0:24:37 > 0:24:40'Which is why you'll never find snakes and lizards living wild
0:24:40 > 0:24:43'in cold countries.
0:24:45 > 0:24:49'But now, Ian's fact-finding mission is over.
0:24:49 > 0:24:53'The thermal images have revealed a secret side to the animals.'
0:24:53 > 0:24:55- It's quite cool, actually. - It's really effective.
0:24:55 > 0:24:57That's really cool.
0:24:57 > 0:25:00'And the keepers now know a little bit more
0:25:00 > 0:25:03'about the creatures they look after.'
0:25:18 > 0:25:20It's almost the end of another show.
0:25:20 > 0:25:22But before we LEAF... Eh?!
0:25:22 > 0:25:25It is time to feed the park's 31 fruit bats
0:25:25 > 0:25:27- with their keeper, Alexa. - Hi, Alexa.
0:25:27 > 0:25:30- Hiya.- We've got a whole load of browse here,
0:25:30 > 0:25:31where shall we put them?
0:25:31 > 0:25:33If we just start grabbing a few bits,
0:25:33 > 0:25:34pop them up here on the netting.
0:25:34 > 0:25:37This is their main feeding station.
0:25:37 > 0:25:40OK. Now, these are, of course, fruit bats.
0:25:40 > 0:25:42So, got to ask the question,
0:25:42 > 0:25:45why are we bringing fruit bats browse and not fruit?
0:25:45 > 0:25:47Does sound really strange but out in the wild,
0:25:47 > 0:25:50they will also eat plant nectars, leafs, leaf buds.
0:25:50 > 0:25:54So we bring it in just for something different for them.
0:25:54 > 0:25:56Helps keep them entertained,
0:25:56 > 0:25:58it's not just the boring fruit all day long.
0:25:58 > 0:26:00And these have got little berries on as well,
0:26:00 > 0:26:02so they might just nibble them.
0:26:02 > 0:26:04- Two-in-one, maybe?- Exactly.
0:26:04 > 0:26:07We sometimes associate bats with wanting blood.
0:26:07 > 0:26:10But do these bats do that, or are they different?
0:26:10 > 0:26:13No, no. These guys only really eat fruit and plant nectar.
0:26:13 > 0:26:17They get all the worldly goods they need from what they eat,
0:26:17 > 0:26:18so they don't need meat.
0:26:18 > 0:26:21You do get different species of bat, though.
0:26:21 > 0:26:24All the ones in this country eat little midges and insects,
0:26:24 > 0:26:26they do a wonderful job doing that.
0:26:26 > 0:26:29But there is the true vampire bat, he does drink blood.
0:26:30 > 0:26:32Is there really a vampire bat?
0:26:32 > 0:26:34There is a vampire bat.
0:26:34 > 0:26:36He doesn't drink blood from us, not generally.
0:26:36 > 0:26:39We drink too much fizzy drinks and things like that,
0:26:39 > 0:26:41so our blood's full of sugar, which isn't good for them.
0:26:41 > 0:26:45So they tend to drink blood from cattle, sheep and pigs.
0:26:45 > 0:26:48Well, they don't seem too interested in our browse at the moment.
0:26:48 > 0:26:51But why don't you guys go BATTY about the next episode of Roar?
0:26:51 > 0:26:54- Thanks very much, Alexa. - True pro, Rani.
0:26:55 > 0:26:58'Nico the gorilla will be 50 years old,
0:26:58 > 0:27:00'and we're up for a party.
0:27:00 > 0:27:02'But, will the birthday boy go bananas
0:27:02 > 0:27:05'if he doesn't get what he wants?'
0:27:07 > 0:27:10'When she was born, the baby giraffe seemed to be struggling.
0:27:10 > 0:27:11'I'll catch up
0:27:11 > 0:27:13'when she's steady on her feet.'
0:27:13 > 0:27:17'And most people are scared of something,
0:27:17 > 0:27:19'sharp teeth, nasty sting, creepy legs.
0:27:19 > 0:27:24'But why is our Roar ranger frightened of a furry little face?
0:27:24 > 0:27:28'All will be revealed next time on Roar.'
0:27:32 > 0:27:37Subtitles by Red Bee Media Ltd
0:27:37 > 0:27:40E-mail subtitling@bbc.co.uk