NARRATOR: From frigid oceans...
Okay, there he is.
NARRATOR: ...to distant jungles...
ULLAS KARANTH: You can keep going a little bit more.
NARRATOR: ...there's a hidden world
of exotic creatures
just out of view.
ARNAUD DESBIEZ: Finding the animal is like looking
for a needle in a haystack.
It's really difficult.
NARRATOR: Around the world,
researchers are tracking the most vulnerable animals,
trying to save them before they vanish forever.
KARANTH: This powerful-looking animal is so fragile.
The pieces of knowledge that are needed
to make it survive
are critical.
NARRATOR: Now, new technology
is revealing their secret lives.
DESBIEZ: They're really silent little spies
that make no noise,
that can capture intimate moments of the animals.
CRAIG PACKER: You get millions and millions of photographs,
and you suddenly see things for the first time.
NARRATOR: Frame by frame,
the invisible world of animals is coming to life.
DESBIEZ: I could not believe this species existed,
that it was right here, around us.
I had no idea they did that.
NARRATOR: Their habits, fears, and most intimate moments.
SARAH FORTUNE: It has completely revolutionized
our ability to understand behaviors.
NARRATOR: Rare footage from the animal kingdom
is offering up new clues.
Can we uncover the secrets to these animals' survival
before it's too late?
"Animal Espionage,"
right now, on "NOVA."
♪
Major funding for "NOVA" is provided by the following:
♪
NARRATOR: Our planet is teeming with millions of species,
yet we've only been able to study a small fraction of them.
In this hidden world, much goes unseen--
until now.
Advances in camera technology
are opening our eyes to the world around us.
LIANA ZANETTE: The invaluable information that people will get
from a simple, wee, little camera
that anybody can buy off the shelf,
it's unbelievable.
NARRATOR: What can researchers learn by spying on animals?
ART RODGERS: Why are they doing that?
And why did they do that?
And what are they going to do next?
NARRATOR: Can a new wave of animal surveillance
turn the tide
and help preserve our planet's most vulnerable species
before they disappear?
♪
Cumberland Sound, Canada,
about 300 miles west of Greenland.
Beneath these frigid waters dwells a mysterious giant--
the bowhead whale.
Little footage of these 100-ton creatures exists.
They are the longest-living mammal on the planet.
Some have reached the ripe old age of 200.
But their survival isn't guaranteed.
The species could be in trouble.
FORTUNE: They're living in the Arctic, and this is a place
where climate change could be threatening their, their future.
NARRATOR: Marine biologist Sarah Fortune studies bowheads
in Cumberland Sound,
where the whales come to feed for months at a time.
But rising temperatures and melting sea ice
are affecting their primary food source--
tiny animals called zooplankton.
Bowheads favor a nutrient-rich variety,
and their numbers are dropping.
This could be catastrophic for the whales:
one bowhead needs to eat about 100 tons of food each year.
FORTUNE: I need know what the whales are feeding on today
and how energy-rich their current food resource is.
NARRATOR: Monitoring their size and weight over time
will tell Sarah if these whales are getting enough to eat.
But tracking them is no simple task.
FORTUNE: Bowheads are a little bit elusive.
They dive for half an hour, an hour.
You spend a lot of time waiting for them to come up again.
And then it's also, can be really difficult
to track where that whale has gone.
Okay, there he is.
NARRATOR: Even when they find a whale,
it's hard to see its entire body.
FORTUNE: We see what everyone else sees--
the top of the whale's head, their flukes,
sort of, a really small proportion of the whale's body.
And so that means that a lot of their behavior goes unknown.
NARRATOR: Fortune and her colleague Bill Koski
are monitoring a group of about 80 bowheads
in Cumberland Sound.
A bowhead expert, Bill is eager to get a new perspective
on an animal he's been studying for decades.
KOSKI: Most of the studies I've done,
I've been flying in an airplane,
and we're circling whales at a thousand feet or so,
so that we won't affect their behavior.
NARRATOR: Any closer, and a noisy plane spooks the whales,
who will dive and disappear.
Is he up now?
NARRATOR: So Sarah is trying a new approach.
She's going spy on the whales
with a-state-of-the-art high-definition drone.
All right, full power. Okay.
FORTUNE: Awesome.
♪
(water sprays out blowhole)
NARRATOR: The drone quietly hovers just above the whales.
(buzzing softly)
They seem oblivious to the flying camera following them.
♪
FORTUNE: It's exactly analogous to a bird.
The same level of reaction
that you would get from a bowhead having birds overhead
is what you get with a drone being overhead.
NARRATOR: Finally, they can see the whale in its entirety.
Its body tells a story about day-to-day life in the Arctic.
FORTUNE: They often need to break thick ice with their heads.
And so, we'll see that they have white scars.
NARRATOR: The scars are like fingerprints,
allowing scientists to identify and track individual whales.
The drone helps the team measure the whale
by comparing its body to the length of the boat.
FORTUNE: That gives us an idea of how fat or how skinny an individual is.
And that's a way that we can assess their overall health.
So, are these whales getting enough food to eat?
Over time, we can monitor these animals
to see how healthy they are
in the face of a changing environment.
NARRATOR: When the whale dives below the surface to feed,
the drone keeps an eye on it.
FORTUNE: Because the water is so clear here,
it provides this really wonderful opportunity
to observe their behaviors over long periods of time.
Otherwise, we would just be sitting on the boat
wondering where the whale had gone.
♪
NARRATOR: Now, clear water and a bird's-eye view
reveal new insights into bowhead behavior.
Biologists used to think that bowheads were solitary creatures
that sometimes swam in pods, but rarely interacted.
FORTUNE: The whales were constantly touching each other.
And before, there was no way
that we could have seen that, right?
It was illuminating to see how these animals
are more social than we could appreciate
just by observing them at the surface.
We're able to see how that whale is engaging with other animals,
how it's engaging with the environment.
So I think it has completely revolutionized our ability
to understand bowhead whale behaviors.
NARRATOR: For scientists like Sarah, the drone is a window
into the lives of these mysterious creatures
and a way to gauge their survival in a changing climate.
When the Inuit's ancestors first settled Baffin Island
thousands of years ago,
the surrounding waters were teeming with whales.
By the late 19th century,
the commercial whaling industry had nearly wiped them out.
Today, the Inuit are among the few communities in the world
permitted to sustainably hunt bowhead whales.
The Inuit in this region take up to five whales per year.
A single bowhead will feed hundreds of people.
♪
Sarah is sharing her research with the board
of the Hunters and Trappers Association,
which manages hunting.
They're concerned about the fate of the 6,500 bowheads
in this area of the Arctic.
FORTUNE: If anyone has any suggestions or questions
that you think we could answer
with this technology,
that would be really helpful to know.
NARRATOR: The images yield new insights
that intrigue even the locals,
who have lived with these whales for decades.
MAN: What part do you study in order to get the age?
KOSKI: Based, based on our experience with the photographs,
the amount of white just in front of the tail,
it gets more and more white as they get older.
So when you see one
with lots of white on it, you know it's a very old whale,
probably 150 years or so.
NARRATOR: Knowing the size and age of the whales around here
helps locals plan for hunts
that leave enough whales in the ocean for future generations.
There's one question
that fascinates both locals and scientists.
Year after year, the bowheads gravitate toward the shore
and hang around the big rocks there.
No one knows why.
Sarah is hoping the drone will explain a mystery
first recorded more than 170 years ago.
Ricky Killabuck, an Inuit fisherman,
brings them to the site.
FORTUNE: So have you seen any whales in this bay this year?
KILLABUCK: Oh, yeah, yeah. Yeah? Okay.
FORTUNE: If you go back to the whaling records dating back to 1845,
whalers had made note
that these whales would go near shore,
and they'd rest their heads, or their chins,
upon these large rocks.
Going along this coast,
we've been seeing whales along the rocks
in this area. Okay.
Some people thought that they might be feeding.
Others thought that they're resting.
NARRATOR: Without a clear view, it was impossible to know.
Around our 11:00.
So we have a whale up ahead.
We're heading towards it now.
TOMMY: Set that camera out to the aft.
Full power, go.
So then, I think you're going to want to bring it
to our 11:00 here, maybe to the bow.
TOMMY: It's starting to come shallow.
FORTUNE: Mm-hmm, it's coming.
♪
NARRATOR: This whale seems to be scratching his back
against the rocks.
FORTUNE: Now we know that the whales aren't just coming here
for feeding purposes.
They're also coming here for molting purposes,
rubbing on these large boulders as exfoliation,
so to help expedite the molting process.
NARRATOR: The best guess is they're trying to keep their skin healthy
and free of parasites.
The drone reveals Cumberland Sound,
with its shallow rocks and plentiful zooplankton,
to be a critical bowhead habitat.
Yet it's also a place destined to change.
FORTUNE: These are whales that will be impacted
in one way or another by environmental change.
We don't know if it's going to be detrimental,
we don't know if these whales will be very adaptable,
but we know that things are going to change,
just like they're going to change
for the people in the North
that are living in these communities.
NARRATOR: For now, keeping a close eye on these giants of the Arctic
is critical.
FORTUNE: The really big win about drones
is that we're able to collect a lot of data about the whales
with zero impact to them.
And so, I think this is a very positive step forwards.
♪
Great, awesome.
Thanks so much, guys.
NARRATOR: For more than 100 years,
we've used cameras to try to capture the natural world
as it truly is, away from human eyes.
In the late 19th century,
an ambitious young photographer named George Shiras III
pioneered the field of spying on animals.
♪
Using crude trip wires and flashbulbs,
he was the first to photograph a hidden world.
He roamed North America,
photographing predator and prey alike.
Published in "National Geographic" in 1906,
his images were the first of their kind
ever printed in that magazine.
The experience turned Shiras from a hunter and fisherman
into a conservationist.
He pushed for the creation of parks and policies
to protect the wildlife he photographed.
Years later, scientists like Arnaud Desbiez
are perfecting Shiras's camera-trap system,
trying to capture images of creatures
that few people have ever laid eyes on.
The animals Arnaud seeks
live in the Pantanal region of Brazil,
far south of the Amazon River.
At nearly 75,000 square miles,
it is the world's largest wetland
and home to some fascinating creatures.
You could also say that the Pantanal is the land of giants.
Here we have giant otters,
giant anteaters,
the largest jaguars.
And of course, the giant armadillo.
NARRATOR: The giant armadillo, which practically no one--
not even among the local population--
has ever seen.
DESBIEZ: The giant armadillo is almost like a ghost species,
the Holy Grail of, of animals.
They occur at very, very low density,
and they're very, very hard to find.
They are a nocturnal species,
so to follow them at night is almost impossible.
NARRATOR: There are more than 20 different species of armadillo
all across the Americas, some as far north as Nebraska.
Like their anteater cousins,
armadillos dine mostly on insects and grubs,
which they dig for with powerful claws
and lap up with sticky, long tongues.
A shell of overlapping bony plates
protects them from predators.
The smallest of the species
could fit in the palm of your hand,
while giant armadillos can grow to be as big
as a Labrador retriever.
But so little is known about them.
How many offspring do they have?
How do they communicate?
Are they thriving or doomed to extinction?
Arnaud is hoping to find out by setting up cameras
right outside their homes.
DESBIEZ: Finding a giant armadillo burrow
is like looking for a needle in a haystack.
It's really, really difficult.
NARRATOR: Individual giant armadillos are thinly scattered
across the Pantanal,
sometimes as few as seven in a 40-square-mile area.
So Arnaud has placed thousands of camera traps like this one
all over the wetlands.
DESBIEZ: A camera trap is essentially
a device that you can place anywhere.
And when something passes in front of it,
it will take a series of pictures and videos.
This is the part I really want to get.
So, I'm going to get the motion sensor to work.
NARRATOR: Then, he waits.
DESBIEZ: So, the camera traps are, for a field biologist,
what a microscope is to a microbiologist.
It helps us see things that we can't see with our own eyes.
The camera traps are basically our eyes in the field.
NARRATOR: Weeks later, Arnaud and his team review the footage.
Frame by frame,
the hidden world of the Pantanal comes to life.
(scientists talking in background)
♪
NARRATOR: But no sign of the giant armadillo.
After sifting through hours' worth of footage,
the star finally appears.
(scientists murmuring excitedly)
(exclaims)
(gasps)
DESBIEZ: Do you remember when you were a child
and you saw your first image of a dinosaur?
That's how I felt the first time I saw an image
of a giant armadillo from a camera trap.
I could not believe that this species existed,
that it was right here, around us.
NARRATOR: Arnaud's fleet of camera traps
has revealed much about this prehistoric creature.
DESBIEZ: We were able to document the role of giant armadillos
as ecosystem engineers.
Giant-armadillo burrows are used by other species
as a refuge against predators,
as a refuge against extreme temperatures,
as a place to forage.
We suddenly were able to register
a whole community of animals using giant-armadillo burrows.
NARRATOR: And that giant sand mound outside their door?
DESBIEZ: It's like their inbox, where they leave messages,
because when they dig, they defecate and urinate.
The giant armadillos, which are solitary creatures,
will communicate and learn about each other
in, from the sand mound.
Leaving a camera trap in front of the sand mound,
we can find out who's coming to visit.
NARRATOR: And the camera traps caught something
never before recorded on camera.
(exclaiming softly)
(scientists chuckling)
NARRATOR: A baby giant armadillo.
(yelps)
(speaking foreign language)
DESBIEZ: It was an incredible experience
to be able to see this tiny little white shape.
They have no coloring.
You can tell that the shell is soft,
and they're a little bit clumsy the way they move.
NARRATOR: The scientists nicknamed the baby
Alex.
DESBIEZ: All of us got extremely attached to this little giant armadillo,
with whom we actually had no physical contact.
Our whole relationship was through these images.
Every time we came to the field, it was an exciting moment.
"What is Alex going to be doing now?
How has he progressed?"
NARRATOR: Thanks to Alex,
scientists estimate that giant armadillos
have just one offspring every three years.
The babies nurse for a year
and live with their mothers for 18 months.
DESBIEZ: Parental care is much, much longer
than we could ever have imagined.
And so, we were able to follow that--
time spent inside the burrow,
time spent outside the burrow.
And so those measures of time, now, today,
help us to estimate the age of a baby giant armadillo,
because we related those to the age of Alex.
(speaking Portuguese)
NARRATOR: Arnaud shared Alex's story with the public.
Soon, everyone was hooked on the day-to-day life
of this vulnerable baby armadillo.
DESBIEZ: I remember telling them
when he predated his first termite mound.
I remember when he dug his first burrows.
We were almost like you'd celebrate
a child's first achievements;
we were doing that with Alex.
NARRATOR: After a few months living on his own,
Alex's story took a sad turn.
DESBIEZ: One day, we saw
that he had entered one of his mother's old burrows.
So we set a camera trap in front of the burrow,
but he didn't come out that night.
And he didn't come out the night after.
(vulture squawking)
We saw a vulture land in front of the camera trap.
I went and put my face against the burrow,
and I smelled a rotting, nasty smell from the burrow.
NARRATOR: A necropsy revealed a mortal wound in his shoulder.
Only one animal in this area could inflict such damage:
the puma.
News of Alex's death hit hard.
There was an outpouring of public sympathy.
DESBIEZ: This little armadillo had actually become
quite the ambassador for, for his species.
People were able to understand how vulnerable this species is,
and how easy it is to locally extinct
a population of giant armadillos,
because any threat-- whether it's habitat loss
or hunting or roadkill--
will have a huge impact on the species.
NARRATOR: That impact is already evident.
In the past 25 years, the giant armadillo population
has likely declined by at least 30%.
In eight years, Arnaud's camera traps
have captured just 50 giant armadillos.
Each one needs monitoring.
DESBIEZ (whispering): So now we just applied the anesthetic.
We're going to wait a few minutes
for the animal to fall asleep,
and then we'll take him out for, to start the procedure.
NARRATOR: Arnaud and his team will tag, track,
and spy on this young armadillo, like they did with Alex.
DESBIEZ: It's a highlight of our project.
This is a moment we get to interact
and get to meet the species we hardly spend any time with.
We're actually like paparazzi,
we're spying on the animal the whole time.
So, for us, yes, it's like meeting a celebrity.
It's a, this is a highlight for us.
It's very, very exciting.
NARRATOR: Today, state authorities in Brazil
use the giant armadillo as a guide
when planning new parks and protected areas.
The goal is to keep this species' habitat intact.
Arnaud's camera trap data is a key piece of those efforts.
DESBIEZ: We will try to estimate densities
and find out how many are still left,
so that we can find out,
are there enough giant armadillos for the future,
or are these populations already ecologically extinct?
And so we want to inform conservation measures,
such as habitat protection, creation of corridors,
so that we can protect giant armadillos
for generations to come.
♪
NARRATOR: Remote cameras introduce us
to species rarely seen by the human eye,
and invite us to see the world from a different point of view.
♪
MAN (on radio): Location's coming up just over this next ridgeline.
NARRATOR: Research scientist Art Rodgers is headed
into Canada's boreal forest,
a large swath of mostly coniferous trees and bogs
stretching across the country.
It's home to rare and endangered animals,
including a subspecies of reindeer,
the boreal woodland caribou.
Caribou roam across Europe, Siberia, and North America.
RODGERS: Where's the antenna?
BLAKE: It's in my pack.
NARRATOR: Here, in Ontario's boreal forest,
there are just 5,000 boreal woodland caribou left--
and they are hard to find.
RODGERS: These caribou generally don't occur in large numbers.
They're fairly solitary animals,
moving in relatively small groups
of maybe five to ten.
NARRATOR: Industrial development poses
a serious threat to these caribou.
They need vast areas of intact forest to survive,
and that land is disappearing.
Art wants to figure out which habitats need protecting
to ensure the caribou don't go extinct.
RODGERS: One of the key things we, we need to know about caribou
is their food habits.
We know that caribou are eating lichen through the wintertime.
So, we wanted to find out
what caribou were eating during the summertime.
What kinds of habitats have the food that they really need?
NARRATOR: These caribou roam across 100 square miles or more,
and are hard to track.
Camera traps are not an option.
So, one of Art's colleagues came up with an idea:
why not hitch a ride with the caribou
and watch them eat?
RODGERS: Huh, oh, there it is.
BLAKE: We were close.
RODGERS: Ah, good place for it.
NARRATOR: This lightweight collar
contains a small camera and GPS.
The leather, the belting isn't chewed too much.
NARRATOR: Six months ago, researchers placed it
around the neck of a captured caribou.
RODGERS: The camera is programmed
to take a ten-second clip every ten minutes
for two hours in the morning and two hours towards the evening,
during the times of day
when we know that caribou are likely to be feeding.
Yeah, we got the collar.
NARRATOR: Art is hoping the footage on this camera will reveal
everything he wants to know
about where and what this caribou ate.
Oh, here we go, look at this.
♪
NARRATOR: Not Oscar-winning cinematography,
but to Art, the footage is simply amazing.
RODGERS: Wow, look.
We can see this.
We can actually see what they're doing.
We can see what they're eating.
It allows you to accompany the animal
on its journey through life.
NARRATOR: Finally, Art and his team can see what caribou are munching on
during the summer.
The result is surprising:
more lichen.
We thought, well, once, you know, the world turns green,
and all the other plants and leafy vegetation comes up,
that they would switch on to the, the easy stuff,
relatively speaking.
And relatively more nutritious.
NARRATOR: But the way they eat it in the summer is unique.
RODGERS: They graze along the top of the lichen mat,
and maybe just take the top centimeter or two,
a couple of centimeters, sort of the newest growth on the lichen.
And in a sense, you can call that sort of farming the lichen.
They're leaving some behind to grow back for another time.
NARRATOR: And the cameras turn up more surprises.
Caribou like mushrooms.
RODGERS: It's quite amusing to watch
a caribou walking through a forest,
feeding on these large mushrooms
and basically just picking them off.
Oh, there goes another mushroom.
And another one.
RODGERS: There's just no other way
we would have known that or seen that,
and no one ever has, till we got these videos.
NARRATOR: With fresh water scarce in the winter months,
caribou wash their food down
by mushing up snow and ice with their hooves,
a behavior Art calls slushing.
The cameras create caribou home movies of entire herds,
including its newest members.
RODGERS: One of the most exciting moments was
the first time we saw a newborn calf in one of our video clips
trying to stand up for the first time,
and mom drying it off.
It gave me the impression right away that,
"Gosh, we're going to see all kinds of wonderful things
"that we would never, ever, ever see any other way
than without having these video cameras on the collars."
NARRATOR: One key discovery:
certain habitats are especially important
for calf-bearing and -rearing.
New mothers stick close to the forest's lakes and bogs,
with nearby islands.
If mom senses a predator, she can swim her calf to safety.
Over the course of eight years,
scientists have mounted cameras on dozens of caribou here.
They can see the boreal forest as a caribou would
and understand which areas it needs
to survive.
RODGERS: And when we know what those habitat types are,
we can start planning for those,
in terms of, of land-use planning and forest management
and other industrial developments,
and make sure that there is enough of that
to conserve caribou on the landscape.
NARRATOR: Camera technology is opening our eyes
to the hidden lives of animals.
But what can it tell us about not just one species,
but an entire ecosystem?
♪
We need hundreds of cameras in this area if we can get it.
NARRATOR: Biologist Craig Packer has traveled all over Africa,
studying wildlife in the continent's parks and reserves.
And it's clear to him the animals are in trouble.
PACKER: A lot of the research all points to the same thing:
that wildlife populations are declining quite rapidly.
NARRATOR: In Africa, elephants,
lions,
wild dogs,
and the black rhino
are just a few of the species
whose numbers have plummeted in the past 50 years.
Habitat loss and poaching
are the biggest threats to their existence.
Different countries are tackling these problems
with a variety of methods,
in the hopes of saving their wildlife.
But how can anyone know
which conservation methods are actually working?
What I know as a scientist is that we have to measure things.
So we want to make it possible
for people to have readily available to them
reliable information on the abundance and the trends
in all of the species within their reserves.
♪
NARRATOR: So Craig had an idea.
What if you took a census
of all the wildlife parks and reserves in Africa
to get a clear picture
of animal populations and conservation methods?
PACKER: I'm aiming for this program to include camera grids
from 50 different sites.
This will be able to provide data
that we can use to assess how things are going
in terms of the conservation.
We've got literally thousands of these cameras
being set up all over Africa.
Just have to make sure we know where we are and when.
So we're in the Klaserie Reserve,
this is camera K013,
and this is the 22nd of July, I hope.
This is the 23rd of July.
So we'll have camera-trap grids in Kruger Park,
Mountain Zebra National Park,
Maasai Mara in Kenya.
There's cameras in Ruaha in Tanzania.
There are cameras in Niassa Reserve in Mozambique.
NARRATOR: Thousands of motion-sensor cameras,
powered on 24/7 for weeks at a time,
watching everything.
They will show that what may look
like a tranquil savanna landscape
is actually an ecosystem teeming with life.
♪
The cameras reveal where zebras gather...
The gentle intimacy of elephants...
And an antelope's curious nature.
But the cameras were snapping photos nonstop.
PACKER: The practicalities were daunting.
We were generating millions of photographs.
NARRATOR: How do you make scientific sense out of so many images?
Then, Craig's graduate students came up with a solution:
the internet.
They would upload all their photos
and ask the world for help.
PACKER: And you could have volunteers from all over the world
look at your data and then help classify it.
NARRATOR: More than 140,000 people from all across the globe
have participated in Craig's project
as citizen scientists.
PACKER: There is a real community
around the camera-trap process
that involves a broader segment of society
than we ever could have otherwise.
♪
NARRATOR: So far, millions of pictures and over 50 species
have been IDed and catalogued.
The citizen scientists have helped discover behaviors
that had been mysteries to biologists,
like relationships between major predators.
PACKER: After a very large number of observations of lions
at these cameras,
we never saw a cheetah show up at the same spot
less than 12 hours afterwards.
So they waited a good, safe time.
And then they might come
and actually sleep under the same tree,
so they're, it's kind of a timeshare.
And they're safe enough apart in time
that there's no risk of an encounter.
NARRATOR: The cameras capture some surprising moments.
With the cameras, we know where everything goes at night.
♪
Birds that ordinarily roost in trees
we've discovered like to roost
in the crotch of a giraffe, for example.
These are oxpeckers
who've decided that that's a nice, warm place
to spend the night, and I had no idea they did that.
There's also interactions between other species
that sometimes seem really amusing,
like a warthog that looks like it's talking to a gazelle.
So those kinds of things can just suddenly make you laugh.
NARRATOR: And while some images might bring a smile,
all are part of a long-term study
trying to answer tough questions about wildlife management
in one of the wildest places on Earth.
Can you save prey animals without destroying predators?
Do fences help or hurt?
What investments are most effective
when you're managing a wildlife reserve?
PACKER: An ideal outcome ten to 15 years from now is,
we have a really good view of what's going on.
I think the ultimate power of these cameras is
that you've got hundreds of eyes out in the field
that are collecting information.
And you have literally hundreds of thousands of eyes
looking at those photographs
that are all part of the scientific program
to say, "This is what's happening.
This is how well this area is being conserved."
♪
NARRATOR: Sometimes, conventional camera traps
can't capture all the data that scientists need.
MIKE CLINCHY: So this is...
ZANETTE: All right, we're at Den Four, this is ABR 15.
Right.
NARRATOR: Like Craig,
biologists Liana Zanette and Mike Clinchy are spying
on animals in South Africa.
But their camera traps are very different.
It's playing hoopoes.
NARRATOR: This camera setup plays back sounds of predators
in order to trigger a fear response.
So lions at 11:42 on the 23rd of July.
Make the terrible noise, there we are.
(lions growling on recording)
ZANETTE: When the animal walks by,
the system will activate the speaker.
It'll get that ten seconds of sound,
so we can see what the animal was doing
just before it heard the sound,
what it does when it's hearing the sound,
and also what it does after the sound stops.
NARRATOR: This may sound like a mean practical joke.
But Liana and Mike are trying
to understand the role that fear plays in an ecosystem.
What happens when animals aren't killed
but just scared?
ZANETTE: We are basically counting fear.
So we're figuring out the degree
to which fear affects everything.
NARRATOR: Their work addresses a serious problem
in ecosystems all over the world:
the dwindling number of scary, but natural, predators.
ZANETTE: Wherever large carnivores have been exterminated,
there's often massive ecosystem problems.
The prey have nothing to fear.
And because they have nothing to fear,
they can overgraze everything down to the ground.
That's happened repeatedly all over the world,
it continues to happen,
and it's a real ecological problem.
NARRATOR: Decades ago,
Yellowstone National Park faced a crisis.
With the native gray wolf locally extinct,
the elk population exploded,
gorging on plants and decimating the landscape.
In 1995, the park service
reintroduced the gray wolf to Yellowstone,
and the elk population dropped.
Soon, parts of the ecosystem began to change.
Vegetation flourished.
Willow trees thrived,
helping to stabilize the once-eroding river banks.
Scavengers such as fox, black bear,
and even birds
benefited from the elk carcasses
left by wolves.
Exactly how the wolves changed Yellowstone's landscape
is still being debated.
But Liana and Mike say it's not just
about the number of kills that predators make,
it's how many prey they scare.
ZANETTE: Predators will kill way fewer prey
than they scare.
Predators scare all of their prey,
they kill a few of them.
NARRATOR: To better understand
how fear affects animals,
Liana and Mike have spent days setting up dozens of cameras
that record video and play sounds
from three different predators here:
lions, cheetahs, and wild dogs.
ZANETTE: The cameras give us the ability
to do a manipulation of this sort,
which is very difficult.
I mean, working out here is very difficult, right?
These animals, we don't know where they're going to be.
They're not radio-tagged or anything like that.
I don't want to be out here at night,
when all the lions and the cheetahs
and the leopards are out.
Thankfully, we have the cameras that can be out here.
♪
NARRATOR: A week later, they return.
Grab the laptop.
Okay, just double-check.
NARRATOR: Looking through hours of footage,
Liana and Mike analyze fear responses
to the three predators.
(recorded wild dogs barking)
ZANETTE: This is... ooh!
Ooh, didn't like the wild dogs.
(chuckles)
NARRATOR: Cheetahs startle some animals...
(recorded cheetah moaning)
But not others.
Wild dogs are scary...
(recorded wild dogs barking)
♪
Unless you're a rhino.
(recorded lion growling)
And lions make just about everybody run for the hills.
(recorded lion roars)
(recorded lion growling)
ZANETTE: Camera 13.
CLINCHY: Camera 13.
NARRATOR: The next phase will be to see
how fear affects these animals' reproduction rates
and feeding times.
Liana and Mike have conducted similar studies
elsewhere in the world,
and the results are startling.
ZANETTE: What we've discovered over the years
is that this has massive repercussions
on a long timescale in terms of the number of offspring
that animals are able to produce.
(chirping)
NARRATOR: In British Columbia, sparrows subjected
to the sounds of a hawk
produced 40% fewer offspring.
Raccoons frightened by hearing large carnivores...
(recorded animal growling)
...spent 66% less time feeding,
leaving more crabs and fish in the oceans.
And when cougars heard the sound of their predator-- humans--
their feeding times went down by half.
ZANETTE: Just because they think that there's predators around,
there's fewer offspring that are produced.
The predators aren't killing the offspring.
It's just thinking that there's predators around
that is causing this massive reduction in population.
NARRATOR: Their research is sounding an alarm to conservationists:
Big, scary predators affect landscapes
in ways that aren't always obvious.
Failing to protect them
could cause entire ecosystems to collapse.
ZANETTE: By incorporating fear into the equation,
we have a much better understanding
of management plans that, that may work,
management plans that will not work.
It's just the beginning of a whole new understanding
of how the fear of predators can shape everything.
It's unbelievable.
♪
NARRATOR: On another continent,
a predator at the apex of the food chain
is struggling to survive:
the wild tiger.
The largest member of the cat family,
tigers can weigh 500 pounds or more.
They roam solo, and hunt often;
an adult tiger needs one large prey animal per week
to survive.
KARANTH: You can keep going a little bit more.
NARRATOR: Ullas Karanth is a tiger expert and conservationist
working in Karnataka state in India,
where most of the world's tigers live.
He has dedicated his life
to preserving these elusive predators.
I grew up in a small village.
The local culture had tiger deeply infused in it.
People used to wear tiger masks and dance during festivals.
Yet ironically,
last of the wild tigers were being hunted out
by people around me.
NARRATOR: 100 years ago,
there were close to 100,000 tigers in Asia.
Today, only about 3,500 remain.
Most of them are in India,
where conservation campaigns and a hunting ban
saved the species from local extinction.
But even here,
this iconic predator is far from safe.
(rifle fires)
Poaching is still a problem.
And as India develops at a rapid clip,
tiger habitats get carved up.
In some areas, tigers are running out of prey,
such as deer and wild cattle.
KARANTH: Often tigers disappear
not because they have been hunted,
but because their food has been taken away,
their prey have been hunted out by local people.
NARRATOR: How do you protect
one of the world's most vulnerable predators
in one of the fastest-growing countries?
KARANTH: Conservation is a difficult enterprise.
That's where the role of counting tigers accurately,
monitoring their populations,
monitoring their distributions, comes.
It's an audit of whether tiger conservation
is succeeding or failing.
NARRATOR: An audit that requires accuracy
if we are to know how many tigers are left
and where they are thriving--
not easy when counting one of the world's
most dangerous and elusive predators.
For years, conservationists kept a safe distance
by counting tiger pawprints.
But when a young Ullas Karanth began studying tigers in 1986,
he spotted a serious flaw.
It's almost impossible to identify each tiger individually
from its track shape,
because the speed at which the animal is walking,
the soil on which it's walking--
all these make massive differences
and distort the shape.
It is impossible to wander
across hundreds of square kilometers of tiger habitat
in a couple of weeks,
and find the tracks of every tiger,
so it simply didn't work.
NARRATOR: Ullas had a better idea.
Tiger stripes are like fingerprints--
no two are alike.
Why not count tigers by photographing them?
KARANTH: What camera trapping allows you to do
is to photographically capture a very large number of tigers
over very vast landscapes,
which you cannot do with any other technique.
The stripes on two sides are very different,
so you need two cameras
so that you get both sides of the animal
and identify it permanently.
Once you have a permanent identification,
any single-flank picture
also can be pinned down to that tiger.
NARRATOR: As the database grew, Ullas faced a new challenge.
How do you compare each new tiger image
to thousands of others?
KARANTH: See, you have to compare the same side.
NARRATOR: So, Ullas turned to scientists,
who pioneered a new way to identify individual animals.
This program examines each tiger-stripe pattern
as a series of squares.
In minutes, its algorithm compares this series
to thousands of others, until it hits a match.
KARANTH: Once the model is matched,
then it's very easy to identify.
NARRATOR: Ullas ran decades' worth of tiger photos
through the software.
What emerged were hundreds of matches
for individual tigers.
KARANTH: It adds up to a lot of knowledge about tigers,
how they are spread across the land.
And using that data, we can know
not only how many tigers there are,
we can estimate how those numbers are changing.
We can get to know
what proportion of tigers are surviving,
how many new tigers are getting to the population.
All this adds up to knowledge
that is critical for saving tigers.
NARRATOR: The pictures have revealed how far a tiger can range
from its birthplace-- up to 100 miles.
In some instances,
Ullas's data has been used to convict poachers.
Camera traps are now widely used for tracking tigers in India.
In Karnataka state alone,
Ullas has generated 25 years' worth of data,
information that could give conservationists a clearer idea
of where to focus their efforts, now and in the future.
KARANTH: This powerful-looking animal is so fragile ecologically.
It can disappear so fast.
The pieces of knowledge that are needed to make it survive
are critical.
NARRATOR: Today,
cameras are revealing more about our planet's wildlife
than we could ever see with the naked eye.
In the Pacific, off Vancouver Island,
unmanned cameras are 7,000 feet down,
filming fantastic creatures few people have ever heard of,
let alone seen.
At this bat cave,
high-speed thermal cameras shed light
on an otherwise pitch-black world.
Slowed down, the images allow scientists to track individuals,
count wing beats--
even watch the bats interact.
(bats squeaking)
This 36-hour time lapse in the savanna
shows us just how many animals are fed by a single kill.
♪
Remote cameras can be left behind
in the coldest places on Earth,
like in Antarctica,
where Penguin Watch uses a network
of 75 weatherproof, solar-powered cameras
to record the secret lives of penguins
and the impact of climate change on their world.
Frame by frame,
cameras document a changing planet
and the risks facing its most vulnerable creatures.
FORTUNE: Someone whose daily life isn't really affected
by environmental change,
to be able to see imagery of the animals
that are reliant on their natural environment
is really powerful,
and I think that's one of the, the benefits of this technology.
♪
NARRATOR: Cameras are playing a major role in conservation,
from the Arctic Circle to deepest Africa.
Their data could help save species from extinction.
PACKER: Unless we can really say
that there are growing populations of wildebeests,
zebra, impala, et cetera,
we can't really be sure
whether these places are truly succeeding.
RODGERS: You could spend all the time in the world
trying to track these animals on foot through the bush,
and never get close enough to, to observe these things.
(caribou grunting)
KARANTH: When so much is invested in tiger conservation--
people even sacrificing their lives for tigers--
we need to know accurately
whether what we are doing is working.
♪
NARRATOR: And with each new image, cameras give us another chance
to connect with the natural world.
DESBIEZ: These images help us
reach people's minds through their hearts.
♪
We can show people, "Look,
"here is this incredible species,
"and it's right here, right now,
and if we don't do something, we will lose it."
♪
Major funding for "NOVA" is provided by the following:
♪
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"NOVA" is also available on Amazon Prime Video.
♪