This content explores the diverse and often extreme hunting strategies and defensive mechanisms employed by various marine predators, highlighting their remarkable adaptations for survival in the ocean's challenging environments.
Mind Map
คลิกเพื่อขยาย
คลิกเพื่อสำรวจ Mind Map แบบอินเตอร์แอคทีฟฉบับเต็ม
- [Narrator 1] The shark waits
for each sense to be triggered,
hearing, smell, sight, electroreception and touch.
The stingray has no other option but to bolt from cover.
(dramatic music)
- [Narrator 2] Shunning the limelight,
a reef stonefish conceals itself on the sea floor.
A master of disguise, it's easy to see
how this predator got its name.
(light music)
It's mottled colors blend in with the reef setting.
It will even tolerate algae growing on its skin
to further aid concealment.
(dramatic music)
By burying itself in the sandy seabed,
it becomes almost invisible.
(dramatic music)
Even its large, bulbous eyes
are indistinguishable from its surroundings.
This nocturnal predator preys on crustaceans,
small fish, and cephalopods that stray too close.
(dramatic music)
The slightest movement would betray its presence.
(dramatic music)
The stonefish's strike is explosive.
(dramatic music)
Its wide gape rapidly envelopes unwary prey.
(dramatic music)
It's use of surprise attack makes it a formidable predator,
but the stonefish is most renowned for its deadly defense.
It's the most venomous fish in the world.
Concealed within its dorsal fin are 13 needle-like spines.
Fed by venom glands, these spines
form a lethal defensive array.
A toxin unique to stonefish known as verrucotoxin
attacks the nervous and circulatory systems,
and can prove fatal to would-be predators.
In humans, stonefish envenomation can result in severe pain
and life-threatening restrictions
to blood flow and breathing.
Hunters beware.
More often than not,
these silent assassins will have the last laugh.
(dramatic music)
(seagulls squawking)
- [Narrator 3] In the 20th century,
whales in the Sea of Okhotsk
were hunted nearly to extinction.
Now, whaling has ended here
and the large mammals have begun to return.
Humpback whales are the most common visitors,
but other species also venture into this remote sea, orcas.
Orcas live in family pods of 10 or more,
led by a dominant female.
The whales are constantly on the move.
That cloud is what they're after, a banquet.
Just hatched in a nearby inlet,
the herring are too young to reproduce.
Two years will pass before they seek
their traditional spawning grounds, if they survive.
(dramatic music)
Orcas are graceful, intelligent hunters.
The orca pod drives the herring together.
Then, the largest member unleashes its powerful tail,
killing or stunning dozens of fish with one mighty blow.
(water splashing) (seabirds squawking)
(light music)
All that remains is to reap the harvest.
(dramatic music)
The orcas gorge while they can.
The herring will soon disperse
and weeks may pass before the pod finds such riches again.
(whales singing)
Like orcas, humpback whales also hunt in groups,
but with different tactics.
First, some humpbacks dive under the swarm
to drive it toward the surface.
Others encircle the swarm in a ring of bubbles.
Then they swim through the bubble net, maws agape.
Grooves in the mouth filter out water,
leaving hundreds of fish caught in a single gulp.
Two species, two tactics, same success.
- [Narrator 4] Say hello to the largest predator on Earth,
the sperm whale.
We think of them as gentle giants,
but these submarines-sized mammals
are actually deadly hunters.
Many bear the scars of violent clashes with dangerous prey,
10 times the size of a human.
Since they stalk their prey a mile beneath the surface,
witnessing an actual kill is impossible.
So in New Bedford, Massachusetts,
Bob Rocha has been piecing together clues
to how sperm whale hunt from their bones.
- We have this fantastic animal here.
I would say this is a very effective predator
especially to be able to get to be, like he is, 48 feet,
about 14 and a half meters long.
You don't get that big unless you're a good hunter
- [Narrator 4] Approaching 60 tons,
an adult sperm whale weighs more than a Boeing 737.
Its head is the size of a minibus,
and has a jaw packed with 10-inch teeth,
some as wide as a man's arm,
ideal for keeping hold of its enormous prey,
colossal squid, weighing up to 1600 pounds.
The length of a school bus with two-inch suckers
and a razor-sharp beak, colossal squid
are one of the most formidable predators in the ocean today.
And as there is no natural light
a mile beneath the surface,
sperm whale are hunting them blind.
So how do they find a colossal squid in the dark?
Bob Rocha believes the secret lies
inside their enormous head.
- The obvious thing, of course,
is this giant rectangular block of a head,
which the whale would use for making sound.
- [Narrator 4] So just like bats,
sperm whales track down prey using pulses of sound.
First, they force air from their right nostril
through two muscular clappers at the end of their head.
As the two muscles slap closed, they make a loud click.
These clicks travel out of the head,
through the water, and bounce off prey like an echo.
When the echo returns to the whale,
it carries information about where a squid is located.
(sonar pulses)
- Their ability to use their echolocation
to find their food and get right up to it
and swallow it whole is just so precise.
- It's roughly 204 decibels, peak to peak.
If you were right next to it, it would probably deafen you.
- [Narrator 4] In fact,
it's the loudest sound in the animal kingdom.
These booming sound pulses act like a flashlight
in the dark of the deep sea, enabling sperm whales
to detect colossal squid up to 1500 feet away.
The squid's basic hearing system is unable
to detect the whale's high frequency clicks,
leaving a totally unaware of the approaching danger.
This allows the sperm whale to launch the perfect attack.
(dramatic music)
- [Narrator 5] This hairy frogfish has better luck.
She's an expectant mother,
and has more at stake than just an empty stomach.
(dramatic music)
She tucks behind the coral and waits.
(dramatic music)
(music suddenly increases)
Her mouth balloons to 12 times its original size,
creating a vacuum to suck in the prey.
The entire process takes just 1/6000th of a second,
(dramatic music)
far too quick for the prey to react.
(dramatic music)
(dramatic music intensifies)
It's the fastest bite in the animal kingdom.
(light music)
- [Narrator 2] Amidst the subaquatic realm,
one puny pugilist stands out from the crowd.
The peacock mantis shrimp.
Otherworldly in appearance,
there's more to this odd creature than meets the eye.
It's a formidable predator.
It's bizarre appearance is the result
of 80 million years of evolution.
With an appendage for every occasion,
the peacock mantis shrimp is the Swiss army knife
of the marine world.
(light music)
Five pairs of legs for feeding,
three pairs of legs for walking,
two pairs of antenna for reception, 10 gills for breathing.
Two eye stalks bearing an extraordinary pair
of compound eyes and even a set of windscreen wipers.
But of its 34 appendages,
it's those club shaped limbs at the fore
that make it a true killer.
At just six inches, he punches well above his weight.
His hunting strategy is one of brute force.
Understandable, when prey species include
the well armed and well armed,
not to mention well-camouflaged.
(dramatic music)
But camouflage is of little use
when hunted by a peacock mantis shrimp.
His eyes are amongst the most complex in the animal kingdom.
While human eyes have just three
color photo receptors, he has 12.
With the capacity to see far beyond
the human visible spectrum,
very little escapes his attention.
(dramatic music)
While the crab's defenses are formidable,
this seasoned brawler treats them with contempt.
He's more than a little territorial
and knows exactly who's moving through his patch.
Unaware of the mantis shrimp's presence,
the crab strays close, too close.
(dramatic music)
With the velocity of a 22 caliber bullet,
the mantis shrimp's strike
is the fastest in the animal kingdom.
The assault is so fast that friction
makes the surrounding water boil.
(dramatic music)
The devastating punch knocks limbs off the victim
and delivers a quick death.
- [Narrator 1] The tagged hammerhead begins its search
scanning the sea floor For any signs of life.
The stingray may be hidden beneath the sand,
but it cannot hide from the incredible
hunting senses of the great hammerhead shark.
The shark waits for each sense to be triggered,
hearing, smell, sight, electroreception and touch.
The stingray has no other option but to bolt from cover.
(dramatic music)
(dramatic music continues)
The shark uses its hammer to pin the ray down
to the sea floor and tries to get a good bite,
but the ray fights back.
(dramatic music)
Finally, the hammerhead locks onto the wing
to immobilize its prey, but with blood in the water,
