Original subtitles

Downloaded from YTS.MX

[Tristan Guttridge] It's a hammer. It's a hammer. Woo!

[Tristan] In Andros, there are some huge great hammerheads.

Official YIFY movies site: YTS.MX

[Andy Casagrande] They can become over a thousand pounds.

They can literally reach 20 feet long.

What do these great hammerheads need to eat

that will sustain that size?

[Tristan] Most people really consider the hammerhead

as kind of like a stingray specialist.

But now new evidence suggests...

great hammerheads in Andros

actually specialize hunting other sharks.

[man] Working on another shark.

[man] Holy [bleep].

[Andy] Just recently right here in Andros,

some of the most incredible footage

was captured of a massive great hammerhead

hunting a shark right underneath

-a fisherman's boat. -[man] Oh, God.

[Khrys Carroll] What's so unique about Andros Island

is the hammerheads have little to no interaction with humans.

[Tristan speaking]

[Andy] Andros is the Wild, Wild West.

-[Tristan speaking] -Whoa! Whoa!

[Annie Guttridge] We wanna know, are these great hammerheads

here in Andros hunting smaller sharks?

[Tristan] It's a hammer. It's a hammer.

-[man] You gotta be careful. -[Annie] Careful, careful, careful, careful.

My name is Dr. Tristan Guttridge. I'm a behavioral ecologist.

I've been working with great hammerhead sharks

for over a decade.

To me, the great hammerhead is one of the most iconic,

charismatic shark species that lives on the planet.

They reach huge sizes. I'm talking almost 20 feet.

Plus, they have a head that is shaped like a hammer.

And they use that hammer to pin prey down.

Hammerheads are perfectly evolved

for hunting stingrays.

[Tristan] But now new evidence

here in Andros suggests

these hammerheads are reaching huge sizes

by specializing on hunting other sharks.

[man] That is crazy. Look at this hammerhead.

Oh, it's trying to eat a shark. Oh, my God.

Holy [bleep].

[Annie] We had a local fisher here showing

a great hammerhead hunting on another shark.

[man] He's working on another shark.

[man] Holy [bleep].

The lemon shark was probably like six feet.

The hammerhead was twice its size.

[man] Oh, God.

[Skye Minnis] And it was just chasing it,

trying to get a snack.

[narrator] Researchers need to determine if these videos

are of isolated events

or if they're a sign of a shocking change

to the diet of great hammerheads of Andros Island.

[Tristan] Andros is just a few hundred miles from the US.

It's the biggest island in The Bahamas.

It's critical for us to understand the role

that these bigger predators play in this system

to keep it healthy.

[narrator] But the only way to figure out

what these hammerheads are eating

is to send live tissue samples to an outside lab.

[Tristan] We're gonna take muscle samples

from the great hammerheads themselves.

We can take that sample and we can analyze

its chemical composition.

We can learn about what this hammerhead

has been eating across the last year of its life.

[narrator] To get the sample, they have to get

within inches of the hammerhead.

To get this job done safely

for both the humans and the sharks,

Tristan has assembled an all-star team.

[Tristan] All right. Load up.

[narrator] Including local shark experts,

Khrys Carroll...

I'm a marine scientist with Saving the Blue.

[narrator] and Skye Minnis.

[Skye] I grew up in the ocean

fishing in the shallows with my grandmother.

Now, I am a student at BAMSI.

[narrator] Another Andros local joining

the team is Rontaa Bain,

an experienced freediver with the skills required

to take biopsy samples from free swimming great hammerhead sharks.

[Rontaa] The biggest hammerhead I ever seen

was four meters. I thought it was a boat.

[narrator] Watching their backs

is experienced underwater cameraman,

Andy Casagrande.

For the past 20 years, I've traveled

all over the planet

filming nearly every species of shark.

The great hammerhead is one of my favorites.

[narrator] And Tristan's wife, Annie,

a fearless freediver

who has worked with hammerheads

for over a decade.

Together, they've devised a radical new plan

to lure in giant hammerheads for biopsies.

[Tristan] Taking muscle samples from the great

hammerheads themselves is extremely challenging.

So we've designed

three state-of-the-art decoys.

We've got Octobot

that's gonna mimic

a large octopus or a big squid.

We've got Roboshark here

that's gonna mimic a blacknose,

a small coastal species,

to hopefully see what hammerheads do with sharks.

And, of course, the return of our good friend,

Roboray, mimics a southern stingray.

These look super realistic.

[Andy] Roboray. Roboray.

Last year we had a great hammerhead

come hard in on Roboray.

And I'm excited to try her again.

[narrator] Roboray is best suited for attracting hammerheads

in shallow sandy bottom environments.

But the team has plans to explore

all of Andros' unique underwater habitats,

and that's where Roboshark and Octobot come into play.

[Tristan] We've designed Octobot to draw in

a hammerhead where cephalopods,

squid are coming up during the night to feed.

Roboshark, it's the perfect size

for cruising reef habitat.

The decoy delta force.

I mean, I think any big shark, they're gonna come in and check it out.

These decoys will create a distraction

and then you can come in--

And get the biopsy.

-[Tristan] Exactly. -[Andy] Yes.

Some people might think it's very unorthodox,

but in my opinion, unless you think outside the box,

swim outside the cage, you're never gonna learn

anything new about these animals.

Plan is to set up on three different locations

in real diverse habitats.

Predator Channel in this area here.

[Khrys] Predator Channel, we've known to see

massive great hammerheads.

[Tristan] The dropoff is a perfect launching site

for Octobot.

And then we have Stingray Shelf where we've seen

lots of stingrays before, other small sharks as well.

I just have one question.

What's up with your Mohawk, ABC?

It's not a Mohawk.

It's a shark-hawk.

-Sorry, buddy. -[laughter]

-[Tristan] Everyone ready? -[Skye] Let's do it.

[Tristan] Today, we're starting at Predator Channel.

Old faithful.

It's the site that I've seen the most great hammerheads

here in Andros and a great location

to deploy Roboshark

because it's this transition zone

from the dropoff to the flats.

That's where these hammerheads are working

'cause they can launch attacks.

[narrator] Besides being a known hammerhead hotspot,

Predator Channel is also the location

in which local fishermen recently filmed

the great hammerhead hunting a smaller shark.

[Annie] So we're here in Predator Channel.

We're setting up our BRUV to deploy Roboshark.

So we have some freshly caught yellowtail.

They're very abundant in The Bahamas.

We don't typically filet them

but when we're working with blunt knives,

we make it work.

Annie's gonna be preparing bait for the BRUV,

a baited remote underwater video camera

that has a live feed.

And I'm gonna be scanning the water

for a great hammerhead.

[dramatic music playing]

[Khrys] What are you doing? That is disgusting.

This is the glamorous part of shark week.

No. Oh.

-[Andy] Oh, God. -No.

I've just been sick a little bit in my mouth.

-You want another bit? -[Khrys] I would love another piece.

-Please don't. -Fresh mackerel is probably pretty good.

Mmm.

-[laughs] -Primo.

[Andy] Wow.

No.

[dramatic music playing]

[Tristan] Hammer! Hammer!

[Skye] Hammerhead! Hammer, hammer, hammer!

People!

[Annie] Where's Andy? Andy?

[indistinct chatter]

It's a big female.

Get Roboshark ready.

She's headed towards the wreck.

[narrator] Tristan has spotted

the ideal candidate for a tissue sample.

A great hammerhead that's around 12 feet long.

Large enough to be a shark killer.

[Tristan speaking]

[Khrys speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

Just interesting.

How is everything down there? Anything yet?

[Andy speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

Tristan, ABC, the live feed is in position.

Say cheese, guys.

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Tristan speaking]

[narrator] Even though this female tiger shark

is just a juvenile,

it could one day grow

to be up to 16 feet long

and weigh more than 2,000 pounds.

[Tristan speaking]

[Tristan speaking]

I think I see a fin off the back of the boat.

No, no, no. There. There. It's a hammer.

Oh. That's a hammerhead. That's a hammerhead.

Big. Yes.

[Rontaa] A hundred percent real.

-Guys, that is [bleep] huge. -Where is it?

-Holy [bleep]. -[Skye laughs]

[Khrys speaking]

[Tristan speaking]

[Khrys speaking]

[Tristan speaking]

[dramatic music playing]

[Tristan speaking]

[Tristan speaking]

[Khrys speaking]

[Tristan speaking]

-[Annie] Rontaa, biopsy. -[narrator] With this 12-foot

hammerhead distracted by Roboshark,

the team's freediver

and biopsy specialist, Rontaa,

jumps in the water

so he can get in position

for a tissue sample.

[Tristan speaking]

-Whoa. -Oh, my God.

[Tristan speaking]

[narrator] By triggering a predatory attack from the hammerhead,

Roboshark has done its job a little too well.

And with the shark leaving the area,

the team calls the dive.

[Tristan speaking]

[Andy speaking]

[Rontaa speaking]

You guys head back in.

[Tristan speaking]

Wow. That was a beautiful hammerhead.

-How big was it? -[Andy] Maybe 12 feet.

Super confident shark.

[narrator] Even though Roboshark malfunctioned

before the team had a chance to biopsy the hammerhead,

they still made important observations.

[Andy] Tristan, that was pretty incredible, man.

Roboshark didn't stand a chance.

-[makes sound] -[laughs]

[Andy] Yeah. That's pretty much what happened.

With our decoy, we were able to elicit

predatory behaviors of hammerheads that might

be cruising that reef habitat.

This is fantastic evidence that showcases

the predatory prowess of these giant

great hammerheads.

But now we want to switch

things up and bring out Octobot.

We know that hammerheads feed out in the deep water,

hitting squid and other cephalopods.

So what I'm hoping to do is see

what big hammerhead we can intercept

that's cruising that zone.

[narrator] Octobot was designed specifically

for attracting hammerheads at night near dropoffs.

This is where the shallows suddenly descent

into thousands of feet of open water.

As we know, octopus, squid,

they come up at night to feed,

and we have Octobot here.

Tonight will be a dusk dive on the dropoff.

We're gonna swim Octobot right over the dropoff

that goes down to almost 10,000 feet.

And this is where cephalopods,

squid are coming up during the night to feed.

So I'm taking the lights for bioluminescence, right?

Right. So we've got the visual cue

of the actual octopus and we've also got

the lights too to mimic that.

-That's pretty awesome. -[Tristan] We take this

decoy down off the dropoff.

Maybe we'll get a hit from one of these

big hammerheads that feeds out in the pelagic zone,

which is very different to some of the hammers that feed

on stingrays and sharks on the flats.

[narrator] The pelagic zone is the open ocean

far from shore.

And researchers believe great hammerheads hunt

at night here, where they can encounter lethal deep sea

predators like swordfish

and even the giant squid.

In this dangerous environment,

darkness can provide cover from prey that can bite back.

So what do you think?

Yeah, let's get kraken.

Oh, my God.

[Andy] Every time I go down

in the dark underwater,

it's a little unnerving

because you can't see much further than your face.

These rebreathers, they're great but it's hard work.

-Yeah. -[Tristan] So check everything before you go in.

[narrator] Besides monitoring their complex

rebreather equipment, Tristan will also go

for the all-important hammerhead tissue sample,

-if one appears. -[Andy] All right.

-Feeling good, Tristan? -Oh, yeah. I'm ready.

[Andy] All right. Let's do this.

Looks good. We'll see you in an hour or two.

[Annie] Five, four, three, two, one.

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Andy speaking]

[narrator] Blacknose sharks can be found

all over the southeast Atlantic.

The largest this species gets is around six feet long,

making them ideal prey for a shark-killing hammerhead.

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Tristan speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[narrator] Before attacking,

great hammerheads scan their surroundings

with their massive hammer-shaped cephalofoils.

These are covered in electroreceptors

called ampullae of Lorenzini,

which allow them to detect electrical currents

like heartbeats

or the small electric motors

in Octobot.

[Tristan] Oh!

[Andy speaking]

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

[Tristan speaking]

[Tristan speaking]

[Andy speaking]

[narrator] In the dark,

off Andros Island in The Bahamas,

Tristan Guttridge and Andy Casagrande

are using a squid decoy called Octobot

to lure in monster hammerheads.

[Tristan speaking]

[Andy speaking]

[Tristan speaking]

We lost Octobot.

Something just pulled it over the edge.

[Annie] Yeah. We saw something big.

The current is quite strong.

Wow. I mean, we were in great position.

We were right on the edge of the drop off,

and then it yanked straight off my hand.

Dude.

Octobot live on in memory.

Octobot.

[chuckles]

[Tristan] Last night was crazy.

We had a huge great hammerhead.

And as I was on the edge of the drop off,

I was holding the controller

and it got pulled out of my hands.

[Andy] By the time we got to the drop off,

Octobot was gone

and it was impossible to retrieve.

We're just not equipped to go

that deep to recover.

-That actually was a shark. -That was... That was a shark.

-That is a shark. -That is... That was something.

[narrator] Analysis from Octobot's camera

at the moment the controller was ripped

from Tristan's hands,

shows something coming into frame.

But whether or not it was a great hammerhead is unclear.

If it is, the decoys might be working too well

in eliciting predatory behavior.

With Octobot gone

and Roboshark in the shop for repairs,

the team turns to their last decoy.

[Andy] Now it's time to break out

our old pal, Roboray.

And we're gonna head to this awesome spot

called Gibson Cay.

It's a very productive area.

There's sharks here. There's stingrays.

There's lots of game fish.

This place is a known area...

where hammerheads come to hunt other sharks.

This is where Annie and I saw the hammerhead predating

on a shark in the shallows.

[Annie] Oh, my God!

She's hunting. She's on the reef shark.

It's definitely hunting. Oh, my God!

My God. Look at it there.

[Rontaa] It's eating another shark.

So we split up into two teams.

I'm here with Khrys and Skye.

Can you hand me that BRUV?

[Andy] And we got Tristan and Annie.

Right now, they're fishing over there.

They're hoping to catch a big hammerhead

and pull a biopsy,

because we wanna know

what these monster hammerheads are eating.

This is number one, so 1A.

It's why I like working with my wife

'cause she's way more organized than me.

[narrator] With two decoys down

and no tissue samples yet,

Tristan and Annie turn to drumline fishing,

a tried and true method for hooking up hammerheads

to get the biopsies they need.

[Tristan] I haven't entirely abandoned the decoys

but we have now moved to a more traditional method

which is catch and release,

where we can take a biological tissue sample,

muscle from the side of a vessel

in a more controlled manner.

So we're deploying some drumlines.

We have a weight

which is connected to this long yellow line,

which is then connected to some buoys

and then some mono.

[Tristan] The advantage of using the drumlines

is that we can actually have the animal

next to the side of the vessel

and be able to get much more detailed information

by being able to capture them.

There is a downside.

It's quite a high pressure situation.

You're dealing with a huge animal that has big teeth,

that can slap you in the face with its big tail.

So you really need to be quick and efficient

and make sure that you're being safe

when you're working with these big sharks.

-[Annie] Tristan, you ready? -Yeah.

A little bit further.

[Annie chuckles] Not ready.

[Tristan] Okay. It's good here.

We're actually gonna be set anchored

just around 500 feet away from these rigs

so we can see if anything gets caught

and then we can go straight to it,

work it up, measure it, take our muscle sample,

and then the shark will hopefully be swimming

from bite to release within 12 or 15 minutes.

-Nice. -Very nice.

We're now set up. You can see the rigs.

We've got one, two, three, four, five

-across the channel. -[Annie] When a hammer hits,

we certainly will know about it.

[narrator] With their drumlines set,

Annie and Tristan wait for a hit,

while Andy, Khrys, and Skye prepare to jump in

with Roboray.

I think this is the perfect place.

[Andy] All right. Roboray, game time.

[Skye] We're gonna use the return of Roboray

to get the hammerheads in really close

to collect a tissue sample.

Me and Khrys, we're gonna have front row seat

and we're gonna see what comes in.

I'll keep my eyes open for any hammers

or any other tigers that might be in the area.

What could go wrong?

-[Skye] Let's do this. -[Khrys] Okay. Cool.

[narrator] The team has also deployed

over a dozen BRUVs,

which are baited cameras

rigged with up to 25 pounds of tuna.

Between the BRUVs and Roboray,

any great hammerheads in the area

are in for a feast.

[Skye speaking]

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[narrator] Nurse sharks are bottom feeders.

They eat almost anything they find on the ocean floor,

crushing coral, crustaceans, and small bony fish

with their many rows of small serrated teeth.

[Skye speaking]

[Khrys speaking]

[Skye speaking]

[narrator] Another species takes interest

in the team's bait.

Reef sharks like this are a cornerstone

of the habitats around Andros.

[Skye speaking]

[narrator] Reef sharks might have learned

to find safety in numbers,

because when they're young,

they're hunted by great hammerheads.

[Skye speaking]

[Khrys speaking]

[Skye] Whoa!

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Skye speaking]

[Andy] I copy you.

Roboray is away.

Repeat, Roboray is in the water.

[suspenseful music playing]

[Andy] We're sending in Rontaa.

[narrator] With Roboray deployed,

Rontaa hits the water,

floating at the surface while he waits

for the perfect opportunity

to go in for a tissue sample.

[Andy] Rontaa now is hovering above you guys.

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Skye] Whoa!

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Andy speaking]

[Khrys speaking]

[Skye speaking]

[Khrys speaking]

[Andy] I copy you, Khrys.

[narrator] Just like with Roboshark and Octobot,

Roboray succeeds in eliciting

a strong predatory response

from a great hammerhead.

But the shark takes off before the team has a chance

to obtain a biopsy.

-Yeah. -Whoo!

What about that dive, guys.

-That was awesome. -It was amazing.

The surge was kind of gnarly

but the sharks definitely came in full effect.

That moment when we saw the hammerhead swim above us--

Yeah. That was... something else.

It was like a buffet for the hammerhead.

You had reefies,

you had the little nurse, and Roboray.

[Andy] Nice work.

[makes explosive sound]

One, two, three.

So we just put another one there.

Four and five.

No bait. Rebait.

-[Annie] What bait is it? -[Tristan] Cuda.

So we've had some ups and downs with the decoys.

These are smart sharks.

But we do have a backup

and that is we try and catch one of these animals

and take a biopsy on the side of the boat.

There's a higher chance of getting hooked by a hook

than getting bit by a shark, definitely.

-Ready to go in? -[Rontaa] Yup.

Bait in.

Like a well-oiled machine,

research machine.

Shark one! Shark one!

-Shark one! -Oh, okay. Yes!

Oh, wow. That's moving.

Stephano, move round and go up the channel

and then we'll pull it in from there.

[narrator] The team's patience finally pays off...

as Tristan and Annie get a hit

on one of their drum lines.

[Tristan] Slow down. Slow down.

It's here on the left.

It is a big shark

'cause it's towing that line.

[Annie] Definitely a big shark, a hundred percent.

[Tristan] Can't see what it is.

-Go over. -[Skye] We're right...

We're right on top of it.

Just be careful it doesn't get in your legs, Julian.

-[Julian] It's a hammer! -[Tristan] It's a hammer!

-It's a hammer! -[Julian] Oh, my God!

-[Tristan] Woo! -[Julian] Woo!

It's a hammerhead.

We've caught a hammerhead

in the channel.

That is not small either.

It's not small.

[narrator] This hammerhead is 12 feet long,

big enough to hunt other sharks.

But the only way to see if this one is a shark killer

is to get the tissue sample.

[Annie] Definitely female I say, yeah?

-Yeah. Yeah. -[Julian] Go, go, go, go, go,

go, go, go, go, go.

[Tristan] Can't get the tail.

[grunts] We radioed them to let them know.

[Stephano speaking]

[Andy] Is it a hambone or they don't know?

-[man] Is it hammer? -[Stephano speaking]

-It's a hammer. It's a hammer. -What?

-All right. Let's go. Let's go. -[Andy] Put the drone up.

[Skye] Oh, look at that.

They got it.

[Khrys] That is awesome.

What a beauty.

Tristan and Annie just caught a hammerhead.

They're gonna get a biopsy.

I'm gonna jump in the water

to film the release.

[Annie] All right. Here we go. This is it, people.

This is it. Nice and easy.

This is it.

Here she comes.

[Tristan] Yeah, I've got it.

Grab its head.

Okay. Pass the biopsy.

[Annie] Look out. Look out.

-Tristan, stand by. -Yeah. I know.

I'm ready.

[Annie] All right. She's set.

[Tristan] Let it go. Let it go.

[Annie] Careful, careful, careful. Careful!

[Tristan] Grab its head.

[Annie] Careful, careful, careful.

-Careful! -[Tristan] Let it go.

[Annie] Tristan, what now?

[Tristan] Okay. Pass the biopsy.

All right. That's good enough.

All right. We're gonna have to release it.

[Annie] She's set.

-She's about ready to go. -[Tristan] That's it.

-Keep trying to get the hook out. -[Annie] Look out.

-Tristan, stand by. -Yeah. I know.

I'm ready.

-She's good? She free? -She's free.

[Tristan] Let her go. Let her go.

She swims.

[dramatic music playing]

[cheering]

Ow!

Sorry.

[Tristan] We got the muscle sample.

We can essentially track

what that hammerhead has been eating

the last year.

You are essentially what you eat.

[narrator] At just under 12 feet long,

the great hammerhead they sampled is well on its way

to becoming one of the behemoths Andros is known for.

And at that size, it's more than big enough

to be a shark killer.

[Tristan] And that's the muscle sample.

Just putting it in here for now.

And this is gold dust.

We now need more samples from great hammerheads here

to really try and understand

if they're specializing on hunting other sharks.

[narrator] But Tristan needs more

than just hammerhead samples.

For this comparative analysis to work,

the team will also need tissue

of potential hammerhead prey species

in the area,

including other sharks.

Shark on! Shark on!

[Tristan] The next big challenge is to go out

and sample the prey species

that these hammerheads are focusing on.

Look at this five-foot reef shark.

Perfect prey, I think, for a 12-foot hammerhead.

We need blacktip sharks,

blacknose, Caribbean reef sharks,

we need southern stingrays.

We caught a lemon shark now.

That would be a perfect snack for a hammerhead.

[narrator] Over the course of the next week,

the team will take muscle samples

from over 30 individual species

of sharks and rays that are abundant in the area.

This is absolutely gold.

Data gold.

[narrator] The mission comes to a close

and all the tissue samples are sent

to a lab in Florida for analysis.

-[Tristan] Hey, Phil, how are you doing? -[Annie] Hey.

We're on the edge of our seats trying

to work out what you're gonna tell us.

[Phil] We just got the data back

and you are gonna be shocked

-by what we have. -Ooh.

[Phil] So we were expecting this hammerhead

to have eaten a lot of stingrays.

But in fact, less than a third of its diet

is comprised of those southern stingrays

-that we sampled. -[Tristan] Okay.

What is it eating then?

The results are surprising.

This is definitely a shark-eating hammerhead.

The tissue tells us that 70%

of what this hammerhead has eaten

-are sharks. -[Tristan] Wow.

-So a shark-eater? -[Annie] What?

[dramatic music playing]

[Tristan] What Dr. Phil has initially found

with these findings,

it's really exciting

and it clearly shows

that that big female shark

that we took the muscle sample of

is a shark-eater.

-That is actually really surprising. -Yeah. I always expected

that the rays would be like right up there.

[narrator] The diet analysis has revealed

Andros' great hammerheads are eating

just about every shark species

that inhabits the island's waters.

[man] He's working on another shark.

[man] Holy [bleep].

[narrator] And not only that, they're hunting them

in every unique habitat

it has to offer.

[Tristan] There are juvenile sharks

of many different species

year round in Andros.

And maybe this allows great hammerheads

to actually be resident year around

to this system,

which is quite novel

for these migratory species

that typically travel thousands of miles.

We have a lot more work to do

because would've suspected a very different result.

We need to look at some of these other hammerheads

and see if they're following a similar trend.

[Tristan] We know that hammerheads across the world

are probably more likely feeding on stingrays.

They've got that big hammer-shaped head

that's really adapted for pinning down rays.

[Skye speaking]

[Tristan] But we might have found

that these hammerheads in Andros

are actually keeping sharks in check.

There has to be something

that keeps those animals in check,

because if there isn't,

then they may overfeed

on other small fishes

that may impact the health

of the rest of the system.

Hopefully, people will see these hammerheads

and understand that they're truly the guardian

of these habitats and ecosystems.