The Bat Man of Mexico Natural World


The Bat Man of Mexico

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Mexico. A wild land.

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The animals that live here do so in greater numbers

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and variety than almost anywhere else on Earth.

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With so much at stake,

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one man has fought tirelessly to protect the wildlife of Mexico,

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but there's a particular creature he's devoted his life to saving.

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Rodrigo Medellin is the champion

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of one of the world's most hated animals - bats.

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There's little bats,

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there's big bats, there's short-snouted, long-snouted,

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big eyes, little eyes, long ears, short ears - every type of bat.

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He is embarking on the culmination of his life's work -

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a mission to save both his favourite bat

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and the legendary drink of Mexico - tequila.

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In Mexico and in other places because of what I do,

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they call me the bat man.

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All I want is that people get the right information about bats

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and about how important they are for us

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and if that entails them calling me the bat man, so be it.

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I AM the bat man.

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Rodrigo Medellin was not like other children.

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While his friends kept gerbils and hamsters,

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Rodrigo's pets were vampire bats.

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I remember when I was a kid,

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I would keep vampire bats in the bathroom of my home,

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feeding them blood from cows - or from me, sometimes -

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keeping blood in the fridge so that I could feed the bats every night.

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That was not easy to withstand, and still my parents let me do that.

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It was fascinating to me to see these bats feeding and interacting

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with each other, and they'd take care of each other so well.

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It was a lot of fun.

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It was the beginning of a lifetime's obsession.

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But Rodrigo grew up in a world that loathes bats.

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In the 19th century, there was this author who wrote a book

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entitled Dracula, that really touched the imagination of people

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around the world

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and that has turned bats into monsters, unfortunately.

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Bats were so hated in Mexico

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because of their association with evil

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that people would hunt them down and kill them,

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burning them in their caves.

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Their populations crashed.

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To this day, people are afraid,

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saying that they're filthy,

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and that they are everything bad in the world.

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That is really not the case at all.

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A kilometre into a mountain south of Mexico City,

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Rodrigo is searching for a bat so persecuted

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that it was nearly lost for ever.

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It's called the lesser long-nosed bat, or tequila bat.

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This is one of his favourite childhood haunts.

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For most people, caves would sound like a terrifying place,

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like a place where they don't belong.

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But caves are my perfect place.

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Caves are an incredibly peaceful place.

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Rodrigo has spent much of the last 20 years underground,

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working to save the tequila bat.

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Bat guano all over.

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Under that layer of bat faeces

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is a whole layer of living insects.

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Beetles, beetle larvae, fly larvae,

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moth larvae, that are just moving everything, everything, everything.

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You look and everything is moving.

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Because bats move from cave to cave, he never knows what he'll find.

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As he approaches the roost, he must leave his lantern outside.

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Our cameras can see what he cannot.

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No-one has seen this before.

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Look at this. There are so many bats around us.

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In this beautiful space.

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There are thousands of bats here, of many different species -

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perhaps even the ones he's after.

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But Rodrigo can't see them.

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If I close my eyes now,

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it's exactly the same as if I have them open, I see absolutely nothing.

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In terms of my ears,

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I am hearing a stream of bats coming from that direction around me

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and passing through, and then a bunch of bats squealing back there.

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I can picture a map of the cave in my head.

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The bats also navigate using their ears,

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but they have evolved the ability to see with sound.

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They make high-pitched sounds beyond our hearing

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and listen for their echoes off objects.

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This how they can fly in the dark.

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This is what is called the hall of hell -

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temperatures well above our comfort zone, close to 38-40 degrees Celsius,

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very high relative humidity - all of my clothes are completely wet.

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People associate this heat with hell.

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But I feel perfectly at home here.

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Rodrigo pushes into the deepest chamber

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to find out if his precious tequila bats are here.

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He may not be able to see the bats, but the guano beneath his feet

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is a vivid history of what's lived in this cave.

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And Rodrigo knows his guano.

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Oh, yes - this is a lump of lesser long-nosed bat poop.

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This tells me that this is indeed a lesser long-nosed bat colony.

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They're here, and thanks to Rodrigo's work, they're safe.

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Today, gates and guardians protect this cave.

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Now Rodrigo must catch one to see if they're healthy.

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To do this without harming them,

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he uses mist nets, too fine for the bats' echolocation to detect.

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My first lesser long-nosed bat came into my hands

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when I was, like, 15. We knew nothing about it.

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Then we found out that they were really endangered.

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We were looking at roosts that were known to have

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many thousands of lesser long-nosed bats

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and when we visited them, they only had a few hundreds or none.

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That immediately told us that they were in trouble.

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So this is one of my best friends.

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This is the lesser-long nosed bat. This is an amazing animal

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that migrates for thousands of kilometres.

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It's a small, but powerful flier. Look at this amazing wing.

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This is what made bats so successful in the night skies.

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Long-fingered hand here and a very long arm here.

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You can see both vein down here

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and a series of muscles stretches here.

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It's very much alive,

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so that they can control making it broader or narrower.

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That makes them masters of the air.

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It's getting ready to start a really exciting time,

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a really demanding time,

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a really dangerous time too, which is migration.

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The migration of this tiny endangered bat

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is one of the greatest in the animal world.

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This epic journey happens at night,

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so it's taken Rodrigo 20 years to work out their route.

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Over his life, he has discovered many of the roosts they use

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on their 2,000-kilometre journey and protected them, one by one.

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The entire migration is powered by nectar.

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I'm going to give it a bit of sugar water here.

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This incredible tongue that they have

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is the perfect instrument for them

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to reach into deep flowers like agave flowers.

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It's incredible that an animal this big can do what these guys do.

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I love them because of that.

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Rodrigo is about to immerse himself in the bats' world.

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By tracking their entire migration,

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he wants to see if he's achieved what many thought impossible -

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saving the tequila bats from extinction.

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The stakes are high - their fate is tied to Mexico's most famous export.

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As a Mexican, I am proud of my country

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and part of the Mexican spirit is a beverage

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that is called tequila.

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These spiky plants are the source of tequila.

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Tequila is a very important part of the Mexican economy

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and it is owed to bats.

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Bats provide pollination for the tequila plant, the agave plant.

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Mexico relies on tequila.

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Over a quarter of a billion litres were exported last year.

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Every plant is harvested by hand by men called jimadores...

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..in a trade passed down from father to son.

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The agaves are planted where they've always grown -

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in the flight path of the bats.

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What agaves do is, they grow and grow and grow

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and then when the time comes, they send this amazing shoot,

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huge flowering stalk, up into the sky.

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They invest all of their energy that they have accumulated over 15 years

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into one single reproductive event

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that basically costs them their lives.

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The link that they formed has been here for millions of years.

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Agaves rely on the bats to move their pollen.

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Bats rely on agaves so that they can survive.

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We could not have this amazing product

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if it wasn't for the bats, and I can't help but think of the bats

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and thank the bats for the incredible service they give us.

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Without the bats, there would be no tequila.

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Bats are so vital in spreading pollen and seeds

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that they're known as the farmers of the tropics.

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Without them, our crops and forests would collapse,

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with terrible consequences for us all.

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The tequila bats' journey takes them west...

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..and they sweep through the valleys and plains of Central Mexico.

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The land beneath them changes constantly.

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And always, they pass over us.

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Until 500km west of where they started,

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they hit the Pacific Ocean, and the uninhabited islands of Chamela.

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Rodrigo has heard reports that the bats have been gathering here.

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He's never been to this cave before.

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To his horror, it's full of cockroaches - he hates cockroaches.

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So many cockroaches, and I almost fell on them!

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But he's astonished by what he finds.

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This is incredible.

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So many lesser-long nosed bats, all around me.

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It's so good to see that their numbers are stable and big.

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The tequila bats have come together from all across Mexico

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with one thing on their minds.

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They're mating here right now,

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and this is a very well protected cave.

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The ocean takes care of that.

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While Lucas, the boatman, tucks into some oysters,

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Rodrigo pushes deeper into the cave,

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and the source of the bats' aphrodisiac.

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Oh, yes!

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A big male, which is what we expected in this cave.

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It's full of males getting ready to reproduce.

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Such well-tempered bat, with big testicles ready for action,

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loaded with sperm and ready for the females that are gathering

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here in this cave, and this should have a patch on its back.

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Oh, yeah - the patch is there, very oily.

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I can feel it with my finger here.

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That patch is put there by the males.

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They put faeces and urine and saliva there,

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and that is very attractive to the females.

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The females are going to come and take a whiff of that

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and just fall in love with this guy.

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This boy is ready to mate

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and it's time to let him go so that he can do his deed.

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There you go, my friend.

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On the roof of this cave,

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an extraordinary mass seduction is taking place.

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Once the females find a male whose sex potion entrances them,

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they'll choose him as their mate.

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And in three months, 1,500 kilometres away,

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a single baby bat will be born.

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It may be alluring for the females,

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but for Rodrigo, the smell is overpowering.

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This is a really stinky cave,

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and there's lots and lots of bats here.

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Lots of them everywhere.

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And this is...oh!

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And this is certainly a challenging cave to be in, to be sure.

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Eventually, the smell and cockroaches are too much,

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even for the bat man.

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The bats will stay on this island for weeks,

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mating and building their strength

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before they continue on the next stage in their migration.

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It will be perhaps 30 sunsets until then.

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And each evening is a changing of the guard.

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As the birds of Mexico head home to roost...

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..all across this enormous country, bats are about to reclaim the night.

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Nowhere is this more spectacular than the bat volcano of Calakmul.

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Predators are gathering.

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It's called the bat volcano, because every night, it erupts.

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This is one of the greatest bat colonies on Earth.

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Perhaps as many as three million bats live here.

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To avoid being eaten, they form a living tornado, 200m tall.

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In this whirling mass,

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it's almost impossible for their predators to choose a target.

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But the bats must head to their feeding grounds,

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and they start to peel off across the forest.

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Now the hunters can strike.

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One bat narrowly escapes.

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Others aren't so lucky.

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Bat falcons and brown jays also swoop in to make their kills.

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But nothing can dent the swarm.

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They're heading for the cornfields across the forest.

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There, they will devour 20 tonnes of insect pests...

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..like this hatching armyworm moth.

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Each moth can produce hundreds of hungry caterpillars.

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And unprotected, the crops would be doomed.

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Most Mexicans don't realise they owe not only their tequila,

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but also their corn to bats.

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Thanks to bats, we're eating this.

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Rodrigo's main weapon to defend the bats is education.

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His teams work in over 30 states across Mexico,

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and he never misses a chance for a bit of bat PR.

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You can see it in the eyes of people when you talk to them

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and it makes sense - all of a sudden, everything makes sense.

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Their frame of mind changes and they're bat friends from then on

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and they propagate the message.

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They talk to people in the house,

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they talk to people in the office, school et cetera.

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And little by little, the situation goes snowballing

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and really, really changes the panorama for the bats.

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I can turn them around in ten minutes.

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In 15 minutes I give them the facts, I give them the evidence,

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I give them the images.

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Over 20 years, Rodrigo and his team have converted the people

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whose land the bats rely on

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from potential destroyers to bat defenders.

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Just a few centuries ago, bats were worshipped in Mexico.

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The darkest month was named after them

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and one of their gods was a bat.

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This is the rainforest of the Maya.

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Because the tequila bats have still not left their island,

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Rodrigo has a chance to return to the place he calls home.

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Once, a vast empire stretched across these lands.

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Now their temples, palaces,

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and sacrificial altars have been swallowed by the forest.

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This jungle is very special to Rodrigo.

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For here, 30 years ago, he helped create the Chajul field station.

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It has since become his base for bat research.

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I always look forward to my first morning,

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when I'm going to be woken up by the howlers calling.

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Nature right there, with you, just outside your window.

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It's great to be back. It's peaceful.

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It really feels like coming home.

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Every time I go into the forest looking for bats,

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there's something different going on.

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When the forest is alive,

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every little piece of the forest that you see has a secret to unveil.

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One of the first nights that I spent here,

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I set my mist nets and I was blown away by the diversity of bats,

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by the abundance of the bats.

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There's nothing like this anywhere else in Mexico.

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Not like this - this is 50, 40 species in a week.

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Many bats that I caught there had never been caught in Mexico before.

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So those are new records for the country.

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In a couple of nights, Rodrigo and his team catch 22 species.

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That's more types of bat than inhabit the entire British Isles.

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Flower nibblers,

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fruit gobblers,

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and even some bats that devour other bats...

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..leaving only their wings.

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And tonight, he's caught something very rare and very weird.

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It's got suckers in its thumbs and in its feet.

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And really real suckers.

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SOFT POP

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Beautiful.

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I have this glass - it's perfectly smooth

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and it's using its suckers to move around the glass.

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This sucker-footed bat can stick to the sides of curled-up jungle leaves

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in which it hides in the daytime.

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There's no other mammal or bird or reptile who have suckers like this.

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This is something really unique in the natural world.

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Now it's time to let him go.

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The suckers make it really hard to come out.

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Some gentle encouragement, and he's away.

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Go on.

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Finally, it's time for Rodrigo to return to the tequila bat island.

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It takes three days by boat, car and foot.

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The females are now pregnant

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and are ready to start their long journey north.

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They're not the only travellers who will set out tonight,

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for on the beach, new life is stirring.

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This is a miracle. This is many miracles happening right now.

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These are all olive ridley sea turtles.

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Their mother deposited the eggs here about two months ago

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and these newborns are incredibly powerful,

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having just pushed through about two feet of sand.

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And they're getting ready to go into the ocean.

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Good luck to you all!

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From this beach, the turtles will spread across the oceans.

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Those that survive will be pushed by their instincts

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and their memories to return to this beach to lay their eggs.

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It's this same urge to go back to the place of their birth

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that drives the mother tequila bats north.

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They too are returning to where they started life.

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Before they spread out across Mexico,

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Rodrigo has a rare chance to count them,

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and estimate how many there are.

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This is an amazing thing - I can't see anything.

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The cave is straight ahead of me,

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so this thermal camera can tell me what's going on there.

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Using this technology,

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we can estimate how many bats do we have in this cave.

0:30:130:30:18

I'm guessing about 40,000 lesser long-nosed bats.

0:30:180:30:23

This, of course, is chaos.

0:30:230:30:26

I mean, really, they're going in every possible direction

0:30:260:30:29

but the spectacle is incredible.

0:30:290:30:32

This is staggering, considering that 20 years ago,

0:30:320:30:35

when Rodrigo started to save them,

0:30:350:30:38

many caves only had a few hundred bats, or none at all.

0:30:380:30:41

The path the bats must now take

0:30:480:30:50

lies between the mountains of the Sierra Madre and the sea.

0:30:500:30:54

This fertile land is called the nectar corridor...

0:30:540:30:58

..Because here, every year, billions of flowers open at night.

0:31:000:31:06

The bats must feed on these constantly

0:31:080:31:10

to fuel their journey, otherwise they'll die.

0:31:100:31:14

And they have to time it perfectly.

0:31:140:31:16

Over millions of years, the bats have learned by trial and death

0:31:180:31:23

to track where the nectar is going to show up next.

0:31:230:31:26

Bats are early or bats are late, plants die and bats die.

0:31:280:31:32

What the bats miss is hoovered up quickly in the daytime,

0:31:360:31:40

in a fiesta of hummingbirds.

0:31:400:31:44

But both hummingbird and bat face an uncertain future.

0:31:460:31:52

Humans are affecting every last corner of the world

0:31:520:31:55

in many different ways, some ways that we still don't understand.

0:31:550:31:59

Biological diversity is under threat from many angles,

0:32:000:32:04

and not all of them are manageable or reversible by humans.

0:32:040:32:11

Mexico is developing fast. The land the bats rely on

0:32:130:32:18

is being swallowed and nature is being destroyed.

0:32:180:32:21

But because of Rodrigo, at least some is safe.

0:32:230:32:27

30 years ago, he was asked to assist the new government

0:32:290:32:33

to devise laws to save the wildlife of Mexico.

0:32:330:32:36

Land-owners, the Mexican people,

0:32:380:32:40

worked as partners to create a vast network of linked nature reserves

0:32:400:32:47

made from their private and the government's public land.

0:32:470:32:50

I've worked with small groups, big groups,

0:32:520:32:54

individuals, in the government halls, everywhere.

0:32:540:32:57

All we need is a little bit of information

0:32:570:33:00

and people are going to change about bats.

0:33:000:33:02

Now, over a quarter of Mexico is protected land.

0:33:040:33:08

Where other countries have lost much of their wildlife,

0:33:080:33:11

Mexico is a rare success story.

0:33:110:33:13

But nature in Mexico is still threatened

0:33:160:33:19

and Rodrigo is still pushing to save more.

0:33:190:33:22

This cave is one of the safe ones,

0:33:240:33:26

protected by local families who share the land.

0:33:260:33:29

Down here, Rodrigo and the bats feel safe.

0:33:320:33:37

The peacefulness in here is really overwhelming.

0:33:400:33:45

It's really nice.

0:33:450:33:47

The only sound around you are the bats flying around you.

0:33:470:33:52

This here is a bed of bat guano.

0:33:520:33:56

I could just lie down here and take a nap.

0:33:560:33:59

It would be a very nice nap.

0:33:590:34:01

I just absolutely love it.

0:34:020:34:04

But even in their deepest sanctuaries,

0:34:060:34:09

where their bodies lie undisturbed by any scavenger,

0:34:090:34:12

they're never quite secure.

0:34:120:34:14

For this cave is called the cave of the serpents.

0:34:140:34:17

Somehow, a group of snakes

0:34:220:34:26

have learned that they can catch their food here.

0:34:260:34:29

This is something I have never seen before.

0:34:300:34:33

These are rat snakes.

0:34:330:34:36

But they're getting used to eating bats inside the cave,

0:34:360:34:40

as they come out.

0:34:400:34:42

As darkness falls outside, the bats prepare to leave.

0:34:440:34:48

From much deeper underground,

0:34:500:34:52

they start to throng the narrow passages towards the surface.

0:34:520:34:55

And the snakes start to emerge.

0:34:570:34:59

Look at that!

0:35:070:35:09

This snake is deep into the cave,

0:35:120:35:17

where the bats are supposed to be completely safe from predators.

0:35:170:35:21

Not so! Dinner.

0:35:220:35:25

The bat dwarfs the snake's head.

0:35:280:35:31

To swallow it, the snake must dislocate its jaw.

0:35:310:35:35

This is one more danger that bats face

0:35:360:35:40

along their migration,

0:35:400:35:44

and still they're there and surviving.

0:35:440:35:47

THUNDER CRASHES

0:35:560:35:59

But just when the bat populations look safe, disaster strikes.

0:35:590:36:03

Within weeks of each other, not one but two hurricanes hit Mexico

0:36:070:36:12

and batter the entire Pacific coast.

0:36:120:36:15

This is a threat beyond even Rodrigo's control.

0:36:190:36:22

He loses the tequila bats.

0:36:270:36:29

Across the country, he sends his students to everywhere

0:36:330:36:36

the bats have ever been found.

0:36:360:36:38

For three weeks they search, day and night.

0:36:410:36:44

This has never happened before.

0:36:490:36:51

Yeah, OK. So the bats are not here. Well, I don't know.

0:37:050:37:10

If many of the bats have been killed,

0:37:210:37:23

the future for their species is bleak.

0:37:230:37:26

The way I feel right now, the trail is getting cold.

0:37:410:37:44

I'm not sure if we're going to find them.

0:37:450:37:48

Our only hope is to keep poking and looking

0:37:480:37:52

in every little piece of bat habitat that we know of,

0:37:520:37:57

to see if they are there.

0:37:570:37:59

It's a tense time for Rodrigo. He puts out rewards for any leads.

0:38:030:38:08

At last, one of his students thinks they've seen a tequila bat

0:38:110:38:15

in a cave called Las Vegas.

0:38:150:38:17

They block the exits and he heads in alone.

0:38:240:38:28

Finally he emerges - triumphant.

0:38:410:38:45

I found them!

0:38:460:38:48

It took weeks of searching everywhere.

0:38:480:38:51

It took two hurricanes to move the bats around

0:38:510:38:55

so that we could not track them, but they're here.

0:38:550:38:58

I got, like, er, maybe like ten, so the population is healthy.

0:38:580:39:04

Another dot in the migration of this species.

0:39:050:39:08

I'm so relieved. I've found them!

0:39:080:39:10

Oh, wow!

0:39:150:39:16

Oh, look at this! This is a pregnant female.

0:39:230:39:27

Her wings are in great shape.

0:39:270:39:30

Wow! I can feel the head right here and the rump over here.

0:39:320:39:37

This is the baby right here. The baby is really big.

0:39:370:39:40

I can't imagine the energy that this bat has spent

0:39:420:39:49

just flying around with a foetus growing inside her.

0:39:490:39:53

Thank you, mom. You're ready to go.

0:39:530:39:55

With proof that there are bats here in numbers,

0:40:020:40:05

he can get legal protection for the cave.

0:40:050:40:08

The tequila bats have another vital place of permanent safety.

0:40:090:40:14

For Rodrigo, it's time to visit some old friends.

0:40:190:40:23

There are over 1,200 species of bats in the world.

0:40:290:40:32

Three are vampires.

0:40:380:40:40

And two of these species live in this cave.

0:40:470:40:50

I got you!

0:40:570:40:59

I thought this was a common vampire bat

0:40:590:41:02

but it's a hairy-legged vampire bat.

0:41:020:41:04

They're not common at all.

0:41:050:41:07

This hairy-legged vampire bat feeds almost entirely

0:41:080:41:12

on mammal blood in this area here.

0:41:120:41:15

They have a really soft side, which is that they share blood.

0:41:150:41:18

No vampire bat can afford to go one night without feeding.

0:41:180:41:23

We found out that they'd come back from their foraging

0:41:230:41:28

and regurgitate a little bit of the blood for the guys

0:41:280:41:31

that didn't feed that night.

0:41:310:41:34

So basically they have a blood cooperative going

0:41:340:41:37

in every vampire bat colony.

0:41:370:41:40

They are nice. I mean, look at them.

0:41:410:41:43

Really nice.

0:41:450:41:46

This might look like the stuff of nightmares,

0:41:510:41:55

but the cow is oblivious

0:41:550:41:57

to the vampires feeding on its back and sides.

0:41:570:42:01

Vampire teeth are so sharp that the cow doesn't feel their bite,

0:42:010:42:07

and an anticoagulant in their saliva keeps the blood flowing.

0:42:070:42:11

They don't suck, but lick up the flowing juices.

0:42:130:42:16

Often, they will return to feed on the same animal, night after night.

0:42:190:42:23

Regrettably, Rodrigo can't stay for dinner.

0:42:270:42:30

He's back on the trail of the tequila bats.

0:42:320:42:35

He heads north to the end of the nectar corridor

0:42:360:42:40

and the edge of the Pinacate desert.

0:42:400:42:43

The Pinacate desert is one of the great deserts of North America.

0:42:450:42:51

It is part of the Sonoran desert

0:42:510:42:54

and as such is part of the driest desert in this continent.

0:42:540:42:59

It is one of the most challenging places on Earth to make

0:43:000:43:04

a living as a human being or survive as a species.

0:43:040:43:09

This place has been a desert for at least 100,000 years.

0:43:120:43:17

The bats are aiming for a cave, deep in the heart of this desert,

0:43:210:43:26

in the badlands just south of the US border.

0:43:260:43:29

There are no agaves to feed off en route.

0:43:360:43:39

Instead, the tequila bats,

0:43:410:43:43

nearing the end of their three-month pregnancy,

0:43:430:43:46

must seek the flowers of the giant columnar cactuses.

0:43:460:43:50

These flowers accommodate almost half of the bat's body into them.

0:43:510:43:56

It means millions of years of evolution

0:43:570:44:03

in which the flowers have become perfect receptacles

0:44:030:44:08

for the bat's head and snout and tongue

0:44:080:44:13

and the very long tongue of the bat goes into those flowers

0:44:130:44:19

and lick the nectar out and they come out completely covered with pollen.

0:44:190:44:25

They move out, they go to another columnar cactus

0:44:250:44:29

and there is pollination.

0:44:290:44:30

Because he knows the bats will come to the cactus flowers,

0:44:320:44:35

Rodrigo has a chance to solve a puzzle that's long been on his mind.

0:44:350:44:40

How far can they fly in one night?

0:44:420:44:44

It is a female - very lively,

0:44:540:44:58

in very, very good health.

0:44:580:45:01

We're going to mark it with a blue powder.

0:45:010:45:05

Rodrigo coats the bats he catches in harmless UV dust,

0:45:070:45:13

which they will lick off and digest.

0:45:130:45:15

We keep the head out so that the powder

0:45:150:45:18

does not affect its senses.

0:45:180:45:23

That should be enough.

0:45:230:45:25

The bats will now head on to their roost.

0:45:270:45:31

And if Rodrigo can find a glowing bat-dropping there, he can prove

0:45:310:45:34

how far they've flown - at least, in theory.

0:45:340:45:38

No-one has tried this before.

0:45:380:45:40

At daybreak, 50km from the cactuses,

0:45:490:45:52

Rodrigo finally arrives at the most important cave -

0:45:520:45:58

the end point of their long journey.

0:45:580:46:01

The birth cave of the tequila bats.

0:46:020:46:05

This cave is the largest colony

0:46:080:46:14

that this bat has anywhere in the world.

0:46:140:46:19

It's Rodrigo's great hope that enough bats have made it here

0:46:200:46:24

to sustain their population.

0:46:240:46:26

The future of the species depends on what will take place

0:46:280:46:32

in this ancient volcano.

0:46:320:46:34

We cannot get in the cave during the day.

0:46:350:46:39

We would create chaos, worrying females

0:46:390:46:44

that are taking care of their babies.

0:46:440:46:46

Rodrigo must wait by the cave mouth.

0:47:030:47:05

Night falls.

0:47:080:47:09

And then...

0:47:180:47:19

At first a trickle, then more emerge.

0:47:220:47:27

At least some of the bats have made it.

0:47:270:47:29

It's a tremendous relief for Rodrigo.

0:47:310:47:34

Now the mothers have left the cave to find food,

0:47:410:47:44

it's safe for Rodrigo to go inside.

0:47:440:47:47

They turn on their UV torches,

0:47:550:47:58

and carefully comb the cave.

0:47:580:48:01

Ah!

0:48:060:48:07

Blue poop.

0:48:090:48:10

This is proof that these bats are really long distance fliers

0:48:120:48:17

doing 50km one-way trips, and then coming back every night.

0:48:170:48:23

This is a really good find - confirmation.

0:48:230:48:26

To fly to the cactus where Rodrigo dusted it and back

0:48:280:48:32

is a 100-kilometre round trip.

0:48:320:48:35

No-one suspected the bats could fly so far.

0:48:350:48:38

This is a spotted skunk, and it's coming out now.

0:48:390:48:43

I have never seen it before.

0:48:430:48:45

Look at the incredible pattern and a huge feathered plume,

0:48:450:48:50

advertising that it is about to spray us,

0:48:500:48:54

but it chooses to move off into the dark.

0:48:540:48:58

Rodrigo moves far deeper into the maze of the volcano

0:49:030:49:08

than he's ever been before.

0:49:080:49:09

We can check on the reproductive success

0:49:130:49:16

by gauging how many babies are hanging from the roof of a cave.

0:49:160:49:21

At last - far below the desert surface -

0:49:290:49:33

the bats' secret, their nursery.

0:49:330:49:37

This is a group of babies,

0:49:400:49:43

and there's a mix in their ages.

0:49:430:49:48

Most of them are about a week old.

0:49:480:49:51

Very few are one-day-old

0:49:510:49:53

and two-day-old babies. It's always good to see them.

0:49:530:49:57

These are the first babies to be born of what will hopefully

0:50:000:50:04

be hundreds of thousands.

0:50:040:50:07

The future of the entire species hangs in this cave.

0:50:070:50:11

They synchronise their births so that everything happens

0:50:140:50:20

in the space of two weeks, three weeks - that's it.

0:50:200:50:25

You have twice that many bats in there.

0:50:270:50:32

This is...this is huge.

0:50:320:50:34

Oh, yeah, this is a good spot for the camera.

0:50:450:50:48

Rodrigo sets up remote cameras.

0:50:510:50:54

He can't stay when the mothers return,

0:50:540:50:56

so he's never seen what happens here during the day

0:50:560:50:59

when they're reunited with their pups.

0:50:590:51:02

This is a very young baby - one-day-old, two-day-old.

0:51:070:51:12

This is not a good place for the mother to leave this baby.

0:51:120:51:17

The pup is so young, its umbilical cord is still attached.

0:51:190:51:23

It's yet to grow the fur and fat that will keep it warm.

0:51:230:51:27

These babies are tiny.

0:51:270:51:29

At this age, they cannot keep their temperature up.

0:51:290:51:33

They have to be surrounded by dozens or hundreds of other babies

0:51:330:51:39

so that they keep the heat in place in what we call nurseries.

0:51:390:51:44

But this poor guy is here by himself.

0:51:440:51:47

If his mother doesn't come soon,

0:51:470:51:50

his temperature is going to drop and he is going to be in trouble.

0:51:500:51:53

Death is always part of the natural history of these species,

0:51:550:51:58

but I always worry about the fate of these little guys.

0:51:580:52:03

Soon the mothers will start to return

0:52:030:52:05

from across the great desert wastes.

0:52:050:52:08

It's time for Rodrigo to leave.

0:52:080:52:10

In the hours before dawn, the bats flood into the ancient volcano,

0:52:180:52:23

like an eruption in reverse.

0:52:230:52:25

As the day passes on the desert surface,

0:52:320:52:35

the cameras record the bats' hidden lives deep underground.

0:52:350:52:39

At nightfall, once the females have left again,

0:52:430:52:47

they can retrieve the footage.

0:52:470:52:49

It's a long night watching through the many hours recorded.

0:52:500:52:54

This is er...this has to be at around 7 or 8pm.

0:52:560:53:00

Nobody has ever seen a nursery in the process of building up

0:53:020:53:07

the numbers of babies that are being left behind by the mothers.

0:53:070:53:11

-But she's pregnant, right?

-Not this one?

-No, this one.

0:53:130:53:16

And then...

0:53:160:53:18

Look at this!

0:53:180:53:20

-Having a baby!

-Having a...she's having a baby!

0:53:200:53:24

No es possible!

0:53:310:53:33

The baby is coming out!

0:53:380:53:40

THEY SPEAK SPANISH

0:53:400:53:43

This is incredible.

0:53:430:53:45

She's licking, scratching, and again.

0:53:470:53:53

Wow!

0:53:540:53:55

The camera has captured something never seen before.

0:53:590:54:04

-Look at the tiny forearm!

-The face - this is the face!

-Yes!

0:54:040:54:08

First its head, then its wing emerges.

0:54:090:54:13

Then suddenly, the baby is out and clinging to its mother.

0:54:130:54:17

The wings are protecting the baby,

0:54:200:54:22

so nobody can come close to the baby at all.

0:54:220:54:25

We catch a glimpse of the newborn pup's face

0:54:250:54:27

as its mother cleans it in her fingertips.

0:54:270:54:30

Look at that! Ooh! Baby was slipping away from the mother.

0:54:300:54:35

The baby must be very, very slippery

0:54:350:54:38

and it's slipping down away from the control of the mother,

0:54:380:54:42

so she catches it with the wing.

0:54:420:54:45

The mother quickly positions the baby on her teat

0:54:450:54:48

for its first feed of her milk.

0:54:480:54:50

That is amazing.

0:54:520:54:53

There's a few mothers. There's one, two, three, four.

0:54:550:54:59

But this is all babies.

0:54:590:55:01

Over the next few days, the colony swells

0:55:010:55:04

with thousands upon thousands of new babies.

0:55:040:55:08

This is the flagship colony that is helping me understand

0:55:080:55:11

what is the actual conservation status of that species.

0:55:110:55:16

If we multiply that one birth hundreds of thousands of times,

0:55:160:55:21

tells me that the species has recovered.

0:55:210:55:24

Rodrigo could never have dreamed 20 years ago

0:55:280:55:32

that he'd be seeing such a recovery.

0:55:320:55:34

His tequila bats have come home to roost.

0:55:350:55:39

Our work as conservation professionals

0:55:430:55:46

is not to put as many species as we can

0:55:460:55:50

in endangered species lists.

0:55:500:55:52

Our work is to work as hard as we can

0:55:540:55:58

for as long as is needed -

0:55:580:56:00

as long as is needed only - to recover that species.

0:56:000:56:04

Finally, Rodrigo is ready to make an extraordinary announcement.

0:56:060:56:11

There's places where I have to be in big meetings.

0:56:110:56:15

You have to address the world.

0:56:150:56:17

Before that happens, I picture myself in a cave,

0:56:170:56:21

in the darkness, in the quiet, in the peace of a cave.

0:56:210:56:26

Everything is great then.

0:56:260:56:27

At the Ministry of the Environment in Mexico City,

0:56:310:56:34

journalists and ministers pack the room to hear what he has to say.

0:56:340:56:38

APPLAUSE

0:56:380:56:39

HE SPEAKS SPANISH

0:56:400:56:48

Thanks to the work of Rodrigo, his team,

0:56:540:56:57

and hundreds of others across this country, the lesser long-nosed bat

0:56:570:57:02

is the first species in Mexico

0:57:020:57:04

to be officially saved from extinction,

0:57:040:57:07

and it will be removed from the endangered species list.

0:57:070:57:11

This is a clear indication that our work is actually having

0:57:110:57:17

a good impact in the world.

0:57:170:57:18

His method of combining research, law and community education

0:57:200:57:25

has meant every single bat colony has either stabilised or increased.

0:57:250:57:29

His techniques are now being applied with further success

0:57:310:57:35

to save endangered species of all kinds

0:57:350:57:37

across Latin America and the world.

0:57:370:57:40

Rodrigo really is the bat man.

0:57:410:57:45

This is a great day for the lesser long-nosed bat.

0:57:460:57:51

There's a lot of work to be done

0:57:510:57:54

but first, it's time to celebrate.

0:57:540:57:57

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