All language subtitles for Shark.Vs..Giant.Croc.2026.720p.WEBRip.x264.AAC-[YTS.GG - YTS.BZ]

Downloaded from
YTS.BZ

[Narrator] Deep in the wilds
of north-eastern Australia

lies a battleground
like no other.

Official YIFY movies site:
YTS.BZ

A remote tidal river home to
two very different predators.

The bull shark.

Fast, fearless,
and always on the hunt.

And the saltwater crocodile.

A 1,000-pound relic
from the dinosaur age,

with a bite built for ambush.

-Oh here we go.

They're swimming
right next to each other.

[Narrator] What happens
when these ancient foes clash?

A team of scientists
risk all to find out.

[growl]

[thud and growl]

[Narrator] Stretching 87 miles
from the forested slopes of

The Great Dividing Range
to the sandy shores

of the Coral Sea,
the Daintree River

weaves through one of
the oldest rainforests

on the planet.

-Jeez, this is wild!
-Welcome to Jurassic Park!

[Narrator] Shark experts
Nico Lubitz and Adam Barnett

have spent their
lives studying the sharks

around Australia's coast.

Now, their research leads
them to this remote river,

where they aim to
discover if two of the

world's most fearsome
predators are battling for

territory by mounting
a camera on a croc.

[Adam] Oh here we go,
we've got one.

He's a decent size.

He or she....

[Nico] 2 meter croc!

[Narrator] The Giant
saltwater crocodile,

or 'saltie' as it's
known Down Under,

has been stalking these
waters since the time

of the dinosaurs.

With armored defense
and perfect camouflage,

these patient ambush hunters
can hold their breath

for several hours...

...and take down
prey in the blink of an eye.

One of the few animals
able to move between

fresh and salt water,

salties are
perfectly adapted to thrive

in this tidal river.

But are they the
top predator here?

At the river mouth,

Nico and Adam find
the Daintree unleashes

a surge of nutrients
into the ocean,

which in turn attracts
huge shoals of fish.

For a skilled predator
like the saltie,

it's a zone of opportunity.

The turbid waters offer
concealment and

a tactical advantage.

[Nico] This area here that
I'm surveying now looks like a

perfect hunting ground because
you're actually getting a lot

of different sand bars,

a lot of channels and
crevices and so any food

will have to come
off those sand flats and

the predators will be
waiting in the deeper areas

to pick off anything
that comes off at low tide.

Oh, here we go.

[Narrator] Within minutes,

Nico spots a
huge shoal of fish.

[Nico] Oh wow, that's amazing!

Big school of bait right
in the mouth of the river.

I'm still going higher
and higher with the drone,

and there's just
more and more fish.

There's different reasons
for fish to school up like this.

Depends on the
time of the year,

or where you are,
could be for spawning,

could be because there's
a pulse of prey that the

little fish are after,

or to protect themselves
from potential predators.

[Narrator] Crocs aren't
the only ones hunting in

this estuarine kill zone.

Sharks know this frontier
between land and sea can

provide rich pickings too.

[Adam] River mouths are very
interesting because you can

have the interface of like,
uh, freshwater predators,

and you've also got
saltwater predators.

Mate, they are predator
feeding grounds.

Predators will come in to
actually just clean up.

[Narrator] On cue,
Nico spots two Bulls sharks

patrolling the coast.

[Nico] They're swimming
right next to each other,

really looks like they're
actually looking for something,

they're not there just for fun.

Pretty close to each other.

That's definitely
patrolling behavior.

It's unreal.

[Narrator] Adam and Nico
have spent the last ten years

studying Queensland's
bull sharks.

They have caught
and satellite tagged

more than 50 individuals,

and they've discovered
they're not like other sharks.

-They are a coastal species,

so they, they will move
out to the edge of the reef

for instance, where it's,
you know,

nice and clear water,

but they spend a lot time on
the coast where it's turbid.

[Narrator] Living in this
world of low visibility,

sight won't help them here.

[Nico] They've got
very small eyes,

so they actually don't really
care about their sense of

eyesight so much,

they really rely
on other things like

smell, hearing,
electroreception...

[Adam] As soon as
there's a splash,

or a prey is available,
they don't mess around,

they'll actually
just go in and go for it.

[Narrator] Their
speed and aggression,

is what makes bull sharks
such feared hunters.

But perhaps their greatest
difference to other sharks,

is their ability to handle
both salt and fresh water.

There have been reports of
bull sharks being seen over

50 miles up
Queensland's rivers.

-We have this theory,
and so do other people,

that female bull sharks
return to the river

to give birth basically
where they were born.

We've had one female shark
that's gone back to the same

river three years in a row,

and she's moved
way up each time.

[Narrator] It's a clever tactic.

Most rivers have a plentiful
supply of food and far fewer

predators than the ocean.

In theory it's a great
place for young bull sharks

to grow up.

But the Daintree is different.

-There's a lot of crocodiles.

[splash]

The whole idea of having a
nursery area for your pups is

to try and have somewhere
that they can grow up,

get lots of food, grow fast,
relatively safe hopefully.

If the river's got a lot
of crocodiles is that

really safe place?

[Narrator] Are crocs and
bull sharks clashing somewhere

on the Daintree?

Adam and Nico have just 12 days
to put a camera on the back of

a crocodile, and find out!

Back at base,

in the middle of the
Daintree Rainforest,

the team try to figure
out where the frontline

between shark
and croc territory,

might be.

[Nico] So there's couple
of spots of interest I think

for us, um, the first one
is the mouth, obviously,

um, it's a big funneling point,

you see the channel
that we observed running

down the river,

you know this is
perfect hunting ground,

there's going to be
lots of activity,

so if you're a
female bull shark,

that's where your journey
might start, right.

And as you sort of
get into the mouth,

we start seeing big
mangrove systems right,

so they could actually provide
protection for smaller animals.

[Narrator] Around the world,
mangroves are known to be

productive nursery grounds.

Their twisted roots
provide a natural fortress,

not just for young sharks,

but for young fish
and even crocs.

But adult crocs know
there's a lot of food here too,

and they patrol the channels,
waiting for any mistakes.

-And then the
second spot that I thought

was really interesting,
was a bit further upstream,

sort of in the middle
of the river um where

it gets really narrow,

sort of like a
real funneling point,

[Narrator] Just over 300 feet
wide at this point,

the narrow bend is an
obvious place for sharks and

crocs to easily
detect and ambush their

prey or even one another.

-We did see a lot
of crocodiles there--

-And they seem bigger too.

-Yeah, there were a lot of
big ones there too.

And then the third thing I
thought was really interesting,

remember when we were really
far upstream where the sort of

the cattle farms were starting,

and we were like purely
in the freshwater there and

there was very
little tidal influence.

[Adam] Yeah.

[Nico] I've actually heard
from some people that they have

problems with bull
sharks nibbling on their cows!

[Adam] What?

So when the cows
come down to drink,

the bull sharks are
nibbling on their ankles?

-Yeah, I mean to me that
suggests that even up there,

that far upstream,

the bull sharks
aren't that tiny.

[Narrator] To learn where
sharks and crocs could be

clashing and where
the best location will be

to fit a camera to a croc.

Adam and Nico have to
scope out all three locations.

[Adam] So for us the
first thing to try and do,

is to actually get a handle
on where they are in the river.

[Narrator] While the team
suspect adult bull sharks only

enter the river
briefly to pup...

...juveniles may spend
up to five years here

hunting fish like trevally

and barramundi and
growing up to lengths of

six and a half feet.

Voracious eaters, catching
them shouldn't be difficult.

[Nico] The conditions
are actually very good,

so we've got a bunch of
current running down,

the current's quite strong,
it's running out at the moment,

so we're setting
a drum line here,

putting a mullet bait
on which is perfect to

catch bull sharks,

and that current's just
going to run down river and

anything that's sort of in
that direction there is going

to smell it, going to detect it,

and hopefully
going to hit the bait.

[Narrator] Nico and Adam drop
bait in all three locations.

The upper reaches,
the choke point,

and the mangrove river mouth.

-Shark research.
90% boredom, 10% chaos

when you actually
get something to do.

[Narrator] After six hours,

they get a hit at the
choke point six miles up river.

[Adam] Shark on!

I think we've got our first one.

I can see it there.

[Nico] Pretty good size.

It's definitely not a baby.

Let's have a look at it.

There we go.

[Adam] That's a big shark.

[Narrator] To secure the shark,

they need to get
a tail rope on it.

Timing is everything.

[Adam] Hang on, hang on.

[Narrator] One wrong move,

and the sharks teeth could
slice through Adam's hand.

[Adam] Stay still!

That's good.

[Nico] Well, because we do
know there's crocodiles here,

we probably have
to be pretty fast,

I don't want to lean over the
side of the boat for too long.

[Adam] That's true.

[Narrator] With the shark
in a trance-like state

known as tonic immobility,

the team can attach
an acoustic transmitter.

[Adam] So they've got a
certain code on them which

is very like it's a
code for that tag only,

and when that tagged animal
swims near a receiver that we've

got in the water,

it will tell like code,

x, y, z is here at
this time of day, you know,

on this day, so then we
get an idea of when sharks

are using certain
areas in the river,

and also if they
leave the river,

there's receivers up
and down the coast,

so we'll be able to
see how far it moves.

[Narrator] Making a small
incision underneath the skin,

the tag is slipped in
to place, and sewn up.

Next they measure it,

to see where it
falls on the food chain.

[Adam] Total 153.

[Narrator] A large juvenile,

it's a formidable
predator in it's own right.

-I would say, at this size,

the bull shark may still
be on the menu for a big,

big crocodile,
um but in return,

this shark is very capable
of eating small crocodiles,

and that's why we're taking
blood from these animals

because we get such good
information about their

short-term diet and we can
actually see if there's

signatures of crocodiles
maybe popping up in

their blood samples.

[Adam] Might give us an
idea of what it's been eating.

[Narrator] Bloods taken,
it's time for release.

[Adam] Yeah, she swum off.

Woo-hoo.
That was great!

-First shark for the trip.
-First one, a big one!

-Yeah, I just spent six
hours getting cooked in the sun,

but this definitely
makes it worth it.

[Narrator] Over
the next 24 hours,

three more sharks are tagged.

All are big juveniles,

and all are caught
at the choke point.

[Adam] So it's a little
surprising because its an

overlap with the most
density of crocs,

but if you look at it
from a resource aspect,

maybe that's where all the
food is at this time of year,

so both of them are sharing it.

So maybe you have
to trade off risk,

to actually feed.

[Narrator] In addition
to being very narrow,

the choke point sits
right in a key transition area

of the river.

[Nico] You still see
a bit of mangroves,

but you also have mallaluca
swamps, more freshwater plants,

so the environment really
changes from a more saltwater

dominated area,

to a more freshwater
dominated area.

[Narrator] Around the world,

boundary areas like this
tend to be very rich in prey.

[Nico] We have deep holes
that we saw on our sounder

on the boat,

and those deep
holes aggregate prey.

And we also have these
little side creeks,

and those are funneling
points where the currents

sort of interact and
can aggregate food.

[Narrator] It's an ideal
spot for two of the world's

most formidable predators
to compete for prey and

potentially each other.

[Nico] So everything just
leads to that choke point

being the perfect
area to investigate,

and if I had to
put my money on it,

that's where the
battleground is.

[Narrator] Day five
of the expedition.

The team has found the sharks,

now they turn their
attention to the crocs.

Meeting up with
government croc experts

Simon Booth and
Jane Burns they head towards

the choke point to
try and learn more about the

crocs that live here.

Jane and Simon have been
studying the region's crocs for

more than a decade.

And working with local tour
operators they discovered the

area around the choke point
is dominated by a number of

highly territorial
big male boss crocs.

[Simon] They sort of
partition it up, you know,

based on dominance
really, posturing,

fighting for territories.

And once they secure
a territory they will

continually patrol that
you know every 24 hours or

so to make sure that
other competing males

aren't coming in to it.

-And how, how do the
small ones go then if there's

no space left,
what happens to them?

-They, the small ones,
as they grow,

obviously they've got
to keep out of the way

of the big guys,
because you know crocodiles

can be cannibalistic
at times as well,

so they sort of stay out
the way as they grow they'll

venture outside
into other creeks,

uh, traverse along beaches
and disperse out at sea.

[Narrator] It's not just
here in the Daintree

that crocs are
heading out to sea.

Every year, across
Australia's north,

more and more crocodiles are
being spotted in traditional

shark territory.

And it all comes
down to numbers.

Hunted to near extinction
in the 20th century,

in the 1970s they
were given protection.

Today, their population
is slowly recovering.

With over 25,000 crocodiles
in Queensland alone,

more and more are on the move...

...looking for new territory.

-Sometimes in rivers
like this we have crocodiles

turn up covered in barnacles
and they've obviously spent a

good few years out at sea.

They can carve out a
living there on shorebirds,

ah, you know, turtles,
fish quite happily for a

long period of time.

[Narrator] And it's out in
the ocean that members of the

public have witnessed
tantalizing glimpses of what

happens when sharks
and crocs meet.

Competing for prey like turtles
and even turning on each other.

[Narrator] Filmed on a beach
in the Northern Territory,

this footage shows a
bull shark making short work

of a croc carcass.

[Adam] Yeah, it just
went straight up to it,

wasn't much caution,

it just got in there and
started ripping it to shreds.

That's a decent sized
bull shark, too!

-Yeah.

[Simon] You know, that
one's probably a crocodile has

passed away or drowned from
natural causes and anything's

on the menu for them.

-Bull sharks are
such opportunistic predators,

it picks up the scent,

it sees the carcass
and it just rips into it.

So, you know,

if the crocodile was still
alive I think this interaction

would probably be very,
very different.

[Simon] I think it's
that question, you know,

who's bigger and who's
got the most teeth.

[Narrator] To find out if
the Daintree's crocs have

a taste for sharks,
they need to catch one.

So as night falls,

they prepare for a
unique fishing trip.

Working in complete
silence to avoid giving

their position away,

they patrol the river
looking for a flash of orange

in their lights.

Crocs have excellent
night vision.

A reflective layer
behind their retina amplifies

all available light.

But it also reflects light back.

Making them much
easier to spot at night.

3:00 a.m., and the
team spot some movement

in the shallows.

[Simon] There's one.

[Jane] Still up.

[♪ suspenseful music playing]

[Simon] Got it?

[Narrator] Too powerful
to process on the boat,

the croc is taken to
a nearby sand bank.

Highly vocal creatures,

it voices its displeasure
through a series of

growls and hisses.

[hissing and growling]

The team work fast to
secure it's legs and jaws.

-Yeah, so this is the first one
we've caught on the trip.

It's a 3.1 meter croc,

so a nice not too big
to start with.

[Simon] Is that right?

[Narrator] It's too small
for a croc cam but they can

gather other valuable data.

[Simon] Yep, it's girl that one.

Big girl.

Um, it's great to
actually finally get one,

we've seen a few
bigger ones out there,

but probably good to get
a smaller one first to have

a go at it.

[Narrator] They deploy the
thermal drone to keep everyone

safe on the river bank.

Crocs can sneak up
without being seen and

are highly attuned
to any activity...

...especially the
calls of other crocs,

so the team work as
fast as they can to get

a blood sample to
analyze if sharks are

part of their diet.

-Well, I didn't think we'd
be getting this close,

but it's awesome.

I mean as soon as you
put a bag over their eyes,

they're a real
pleasure to be around!

[Adam] Beautiful, I
can feel her breathing.

She's up down, up down.

[Narrator] Just
like bull sharks,

saltwater crocs have
evolved a range of senses

to cope with surviving
in these murky waters.

[Simon] So you
might not see an ear,

like we think of an ear,

but crocodiles have a
flap just here they can

open and close,
and under there basically

that's their ear canal,

they can shut if off
when they go underwater,

open it up when they're at
the surface of out of the water,

wanting to be able to hear.

Um, you see all
these little white dots,

there's one on every
scale of saltwater crocodiles,

so they're what we call the
integumentory sense organs,

and each one is a little
nerve ending with a fluid-filled

sack over it,

um so they can really
feel movement vibration in the

water and hone in on prey
without having to see it.

[Narrator] Successfully
caught and sampled,

it's released back
into the wild.

It's day six of the expedition,

and with the shark and
croc blood samples prepped and

ready for analysis,

Adam heads to the Daintree's
only major settlement,

to follow up on a
local shark rumor.

-So, I've heard stories
that there's a, there's a guy

in the Daintree who
runs tours and he's

actually seen bull sharks
and crocodiles interact,

so I'm going to drive up
there and see exactly what

this guy's got because,

I'm actually really keen to
see what sort of interactions

he has, and, and
where this has occurred...

...upriver, downriver.

[Narrator] Battleground
details that could help the team

target their search.

The forest Adam
drives through is over

180 million years old.

where tree kangaroos
move through the canopy and

the ancient cassowary lurks.

With claws over
four inches long,

it's one of the few birds
known to have killed a human.

Their defense is needed here.

Stray too close to the
Daintree or it's side creeks,

and there's always a chance
you can run in to a crocodile

or even a bull shark.

At a boat ramp nearby,

local wildlife guide
David White shares the

clearest evidence yet of
what happens when these two

top predators meet.

[David] So there's
this picture here.

-Oh yeah,

[David] So that was a
two and half to three foot long

bull shark just
grabbed it there.

-It's right in the mouth,
that's a great shot.

And the shark was
definitely alive,

it wasn't scavenged?

[David] No, it was alive, yeah.

[Narrator] Taken down by
a ten-foot female Croc,

David was able to
fire off three photos before

the shark and the croc
disappeared beneath the surface.

-That was probably the
most surprising thing of

the whole trip
to actually see it.

Like evidence
it's actually there,

not just stories.

[Narrator] And incredibly,
the attack took place right

at the choke point.

-It was low tide,

so when it's low and
the water's down away from

all the mangrove roots,

there's nowhere for the
fish and everything to hide,

so the crocodiles,

they swim along the beach
with their leg stuck out...

...they make a little bit
of damn between their face,

their leg and the shore,

so anything that bumps in
to their leg or their face,

they feel it and they switch
their head around and grab it.

-Ah.

[David] So, he was
just doing that--

-Yeah.
-And he came across,

you know, a small shark,
and he got it and ate it, yeah.

-This sort of science is
like a detective story,

so we've got
crocodile densities high

in that choke point...

...it's obviously a
choke point, it's narrow,

our bull sharks are spending
most of their time in this area,

so you have these
layers of data coming on top,

and then you speak to
David and what he's got video

and picture evidence of
is in those exact spots.

So here we are with
another layer on top.

[Narrator] Amazingly,
it's not the only croc-shark

confrontation that
David has on his phone.

[David] And um,
that's the other one.

-Oh!

[David] I didn't
take that photo,

a friend gave me that photo
and that's the other way around.

So he was fishing and a big
splash half a crocodile came

past missing it's back half.

-Oh wow.

[David] A bull shark.

-Yeah you see
it's not a big croc.

-Not a big croc, probably four,

probably four years old
somewhere around that.

[Adam] Yeah.

[David] But it
got bitten in half.

-So it would probably
be like a larger bull shark

maybe one about to
leave the estuary,

or maybe a female coming in.

[David] Yeah, must have
been a decent size,

crocs are not that soft.

[Adam] Yep.

[Narrator] Back at base,
Adam shares the valuable

intel with Nico.

-The big question is now
how frequent this might happen.

-That's the question.

Is it happening a lot?

And if it is, like this
choke point again seems like

a very good spot for it.

-That's the area.

-It's all sort of
coming together.

-The battleground
we've been looking for.

[Adam] The battleground...
it's the arena!

-The arena!

The river gets super narrow,
yeah that seems to be the area

where we should try and look
for a big male and put a

tracker and camera on him.

-Yeah, alright, let's get on the
bat phone to get Simon around.

-Let's do it.

[Narrator] Day ten of the
expedition and the team head

back to the choke point.

The mission remains to try
and catch a big territorial male

boss croc to take some
blood samples and to fit it

with a satellite tag
and onboard camera.

[Adam] The plan was to
get it on a big croc,

because that big croc
obviously dominates that area.

The Bull sharks we were
tagging were not the babies.

-They were formidable
predators in their own right

I think the biggest one we
got was nearly 1.9 meters.

-So a small croc's
not really going to have

a go at those, we think,
but a big croc though,

can have a go at
anything it wants!

[Narrator] But catching
a big croc requires

a different approach.

[Jane] So, the way we can
go about catching big crocs

is using traps.

We have floating traps as
well as bag traps or gate traps

depending on what you call them.

Um, the way they work is
we set them up on a bank,

and the larger crocs
will smell the bait.

What we use is pig.

That attracts them to
that particular area,

and they go in and bite
down on that food source,

and it triggers the gate,
closes it up.

[Narrator] It sounds
straight forward,

but big crocs have
become kings of their area

for a reason.

They're patient and
savvy predators.

On a shallow riverbank,

just 300 feet
from the choke point,

the team prepare to
set up their first trap.

[Simon] I guess while we're
working around that bank,

um, we just make sure we've got
eyes on the water at all times.

Make sure we haven't got any
critters trying to sneak in

on us while we're, while
we're trying to set the trap up.

We will obviously have some
bait with us as well,

so that bit of scent might get
them a bit more interested,

so you always got to be
vigilant working around the

water doing this sort of work.

[Narrator] The
danger is very real.

Crocodiles have killed
30 people in Australia in

the past 25 years.

And the water's edge is the
most dangerous place to be.

-It, it would be on
that bank before you've even

realized what's happened,

so they use a lot of their
strength in their tail to

really push and lunge
themselves out of the water,

um, so yeah,

you wouldn't have
much time to react.

[metal clanging]

-So, uh, the
trap's pretty big,

you can imagine
the size of the crocodile

you get in here.

[Narrator] Bait is key
to a successful operation.

[Adam] it's looking
straight at you!

[Narrator] So an old pig's
head is tied in to place.

Feral pigs are
common in the Daintree.

And it's thought they
make up a large proportion

of the croc's diet,

as they come down to the
water's edge to drink and bathe.

Using a familiar scent,

the team hopes to
increase their chances of

trapping a big male.

But they soon discover
crocs aren't the only creature

drawn in by the
promise of an easy feed.

-They seem
to get everywhere!

You know, they climb you,
they jump you,

I don't know...

they fall out of
trees on to you.

But they just keep on biting,
yeah, yeah.

[Narrator] Just as territorial
as a big boss croc,

green tree ants
also bite and squirt

acid from their abdomens.

-The worst part to get
them is inside your ear,

or up your pants.

[Simon] They always seem
to go for your ears as well.

-They love the ears, yeah.

[Narrator] First trap set,

four more are positioned
around the choke point,

including one in
the water itself.

All they can do now
is monitor the traps,

and keep them topped
up with fresh bait.

-For three days and three
nights we were just out there

in the swamps trying
to catch the crocodile,

and it just wouldn't happen.

[Narrator] One of the
traps was investigated by a

large croc and broken by it.

[Jane] You think it's
come up that way?

[Simon] Yeah, it's
come up here I think,

jumped around on here,
because it's snapped that...

[Nico] We were getting
annihilated by mozzies,

we were getting hit
hard by green ants,

and it was really
getting to the point where

we were all like,

alright maybe
we're all a bit over it.

[Narrator] Then,
with time running out...

[Simon] We might be on here.

[Narrator] ...and just two
days left of the expedition,

the team's luck changes.

[Jane] We've got
a tail

[Adam] Oh! Yes!

[Simon] Yes, we're in!

[Narrator] A croc is
caught in the river trap...

...and it's a big one.

-That tail
looks a decent size, no?

[Simon] Yeah,
he's close to four.

-Oh, ho-ho,
oh there's head!

[Narrator] At over 13 feet long,

it's the dominant
male at the choke point.

An ideal size to attach a
camera and more than capable

of taking down a bull shark.

-He was calm as,
just floating there,

and Simon said to me that
means that he's not worried,

he knows he's the
dominant animal.

He wasn't sinking.

[growl]

[Adam] And when we got
the boat right up next to him,

and I was sitting right
near him, the growl,

the low guttural grrrr.

It was like don't mess with me.
You know, it was good,

it was, like, really exciting to
get that and you do have a

tiny bit of, like, oh no,
we have to deal with this.

-Yeah, so he's a nice
big healthy croc, this one,

so we will need probably
some extra hands just to help

when we're actually
moving these animals,

they are quite heavy so
yeah probably a bit too much

just for Simon and I,

so we'll get a
few extra hands.

[Adam] Simon was saying
because it's a floating trap and

it was a large
croc it would have been

hard for us to get
it up on the bank and

on a good clearing where
we could actually work on it,

and you have the dangers
if you don't get up on a

good bank that
another croc might come.

It's dangerous for us,

and it's dangerous
for the crocodile,

so one of the safer options
he said was to tow it back

to the boat ramp at night,
when there's no-one around,

we've got the boat ramp lights,

you know we've got
boats in front of it,

it's a much more
controlled and safer area.

[Narrator] 2:00 a.m.,

and a strange convoy
makes it way up the river

towards the boat ramp,

where the team hopes
to take blood samples,

attach a satellite
tag and the croc cam.

Together they hope
these tools could unlock

the secrets of
this battleground.

The first task at the
boat ramp is to secure

the croc's jaws.

[metal thuds]

One of the many dangers of
handling a croc this size.

-His head obviously
is like about you know four

vesablocks all joined together,
so he can swing that in

basically a 180 degree arc,
um as well as up,

so if you are working
around the crocodile,

just keep in mind that you
know whatever radius from the

base of that neck,

just make sure you
stay out of that especially

with your head, um
similarly with the tail,

the tail can just go woof,

one side the other
and just break knees,

ankles, take you off your feet.

[Adam] He's been
pretty calm so far,

which I think might be
a bad thing because when

he gets out he's going to
have a hell of a lot of energy,

so it's going to be pretty
interesting to see how he goes

when he gets out of this thing.

Sounds like its
going to be fun!

-Coming out.

[♪ suspenseful music playing]

[Nico] Death roll.

[♪ suspenseful music playing]

[♪ suspenseful music playing]

[growling]

It's amazing to see
him up this close, yeah,

he's still puffing himself up.

You can see he's taking big
deep breaths to make himself

look bigger, and he's hissing
because he's not happy.

[Adam] He doesn't have to
puff himself up to make himself

look big to us!

-No.

[Narrator] Taking no chances,

the team administer
a light sedative.

They now have just 20
minutes to take some blood,

fit a satellite tag, and the
croc cam, before it wakes up.

The satellite tag is designed
to stay on for 2 years,

giving the team a detailed
picture for the very first

time of how this boss croc
uses the Daintree River.

Tied in to place, next
comes the camera tag.

Designed to pop
off after 24 hours,

it will give the
team a croc-eyed view

of the Daintree,

and could reveal if the
crocs are targeting sharks,

and how they're doing it.

It's been 20 minutes.

Time is running out.

Camera on, Simon
approaches the croc to

check if its still asleep...

...or whether it's pretending.

[growl]

-The noise, this bang,

like two massive pieces of
wood just slammed together.

It's almost like you could
feel the pressure wave coming,

and you're like, oh yeah,
that's a very strong animal.

-If I was a bull shark,
being near those jaws,

that would be one of the
last places I'd want to be.

[Narrator] As dawn breaks over
the Daintree and flying foxes

return to their roosts
in the rainforest,

the boss croc makes it's
way back into the river.

[growl]

-Because the
croc had been sedated,

when they swim off they might
not be at their fully best to

be able to deal with other
Crocs and Crocs, you know,

have a very confrontational
life, basically.

Live for like 80 to 100
years or whatever and they're

fighting the whole time.

So when it actually swam off,
Jane noticed there was another

croc out there, like
where it was heading,

so Jane rushed out in the boat
to like you know basically act

as a bit of a guard
for this crocodile.

[Narrator] As Jane approaches,

the big male
proves his dominance.

[growl]

One low growl is
enough to send the smaller

female scurrying away.

It's a remarkable piece of
behavior caught on croc-cam

in the Daintree for
the very first time.

[♪ triumphant music playing]

But an hour later...

[wood scratching]

disaster strikes.

The camera catches on a
branch and is ripped off.

The team's hopes of the
boss croc filming a face off

with a bull shark are over.

[Jane] He went
in from the back,

and then come
through the front...

[Adam] Yeah.

-...so he probably just pushed,
maybe pushed it through?

-Yeah.
-So...

-To say we're disappointed
is, like, an understatement.

Yeah, we really wanted to see
once it submerged and got

into its normal daily routine.

[Narrator] But all is not lost.

With precious blood
samples in the bag,

and the satellite tag still on,

the secrets of this
battleground could

still be unearthed.

Eight weeks later,

the team return to the
Daintree to check in on their

tagged croc and collect the
listening stations positioned

along the river.

[Nico] There it is!

[Adam] There it is!

[Narrator] The data locked
inside should reveal where the

bull sharks have
been spending their time.

[Adam] There we go!

So this is the
receiver at the choke point,

lots of detections,
like over 1000.

[Nico] For eight weeks
that's perfect.

-Yeah, I mean,
it's just, they're there.

-Yeah, that first shark
we tagged was pretty much

there every day in
that choke point.

[Adam] Yeah, there's only a
couple of days it's missing.

Now check out the
one downstream at the mouth,

what do you see there?

[Nico] Nothing.

-Nada, there's nothing
there at all.

-They didn't go there once!

[Adam] Not getting any
detections in the mouth was a

bit of a surprise, but
interesting that a lot of the

detections were at
the choke point.

-Yeah, so the sharks have
the highest residency where

the crocs have the
highest density.

-Yep.

[Narrator] The satellite
data from the Big Boss Croc

shows a similar pattern.

He didn't leave the
vicinity of the choke point

once in the eight week period.

-He's just been hanging around
there, that's his territory.

[Narrator] It's proof the
Daintree's crocs and sharks are

running into each other
almost every single day.

Given the huge
overlap in territory,

the team expect big things
from the blood results.

-So when we
look at the bloods, um,

you can't see a clear cut
pattern of like the crocodile

definitely has
bull shark in the diet,

and vice versa.

I mean they're
obviously eating some,

but it's not showing
up as eating a lot.

[Nico] Both species have
evolved for millions of years

and in certain areas
alongside each other.

They've got more senses
than we do as humans,

I mean they've got senses we
can't even possibly imagine,

they are better adapted to
low visibility environments,

so I think they're just
so adapted to staying out of

each other's way.

[Adam] It's a size thing right.

If you're a big crocodile and
you have an opportunity to get

a small bull shark while you're
out hunting or sitting there,

and it comes close,
why not take it, you know,

and it's the same
with the reverse.

If you're a bull shark
cruising up and down the river

or about to leave the river
and you see a smaller crocodile,

and it's vulnerable,
you'll take it.

The bigger one wins,
and gets fed.

[water thrashing]