Name: スーパー吸血鬼。 頭足類！？| ジョナサン・バードのブルーワールド (Super Suckers: Cephalopods! | JONATHAN BIRD'S BLUE WORLD)
Uploaded: 2021-01-14T11:00:45.000Z
Duration: 11 min 44 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Today Jonathan investigates the amazing world of suckers!

An octopus is on the prowl, looking for an unsuspecting fish to pounce upon.

A cuttlefish is hunting with mesmerizing colors to distract its prey.

A school of reef squid hover in the water column.

What do these magnificent animals have in common?

Cephalopod means “head-foot” because this animal's head (the part with the eyes) is

The part out in front that looks like a head is actually the body.

And in fact biologists don't call those things feet, they are called arms.

So cephalopod is actually a terrible name, but it's what we have got.

Squid, octopods, cuttlefish and nautiluses are all members of the class cephalopoda,

but the really weird thing is that cephalopods are mollusks.

So they are related to animals like snails and clams, which seems a little crazy.

This is based mostly on their internal construction, not their outward appearance.

Perhaps the most obvious difference between most cephalopods and other mollusks is the

Nautiluses are the only cephalopods with an external shell.

Nautiluses are found in the South Pacific and Indian oceans, typically in deep water.

Cephalopods have well-developed nervous systems, much more sophisticated than other mollusks.

The cephalopod eye is one of the most notable examples of convergent evolution in all of

the animal world, because this eye evolved from completely different ancestors than the

eyes of mammals, yet it turned out to function in almost the exact same way.

Cephalopods, therefore, have extremely good eyesight.

Of course the most well-known of the cephalopods are the octopuses, named for their eight arms.

They are masters of disguise, able to change colors and skin patterns instantly.

With no shell, or bones the octopus can fit through tiny holes.

They make terrible pets because they can escape from virtually any aquarium!

The octopus has a mouth with a beak used to bite prey.

A hunting octopus often balloons over a rock to trap a fish.

Then it will use venomous saliva to kill the prey when it bites.

But the Blue-Ringed octopus of the South Pacific has venom so powerful that the bite of this

The mimic octopus is said to mimic other animals in order to hunt or evade predators.

This one has a convincing flounder imitation going on, but it's unclear how looking like

It might just be the most efficient way to swim and stay camouflaged—convergent camouflage

A coconut octopus in Indonesia carries a shell so that when the need arises, she can hop

This clever behavior makes the octopus a tool user, putting her in a category of animals

considered more sophisticated and intelligent, like monkeys and dolphins.

In the cold water of Puget Sound, a Red Octopus is carrying a crab home for dinner, walking

Giant Pacific Octopus breathes by drawing water into its mantle, a cavity in its body

and squirting it back out through a siphon.

Not only does this move water over the gills, but it gives the octopus the ability to squirt

The siphon can be used for jet propulsion, squirting an octopus away at high speed.

A reef octopus in the Caribbean not only squirts away from me, but leaves a smoke screen behind

Squid and cuttlefish are similar to octopuses, but their small internal shell makes them

So, while the octopus often crawls along the bottom, the squid and cuttlefish like to jet.

In the North Atlantic Ocean, Longfin Squid cruise through the New England shallows.

But when they get annoyed by my camera…they can produce ink too.

More than 8 thousand miles away from New England, the waters of the Philippines are warm and

After the sun goes down, a Flamboyant cuttlefish comes out to hunt.

While the octopus has eight arms, the cuttlefish and squid actually have ten.

Eight of them are of the same length, while the other two are extra long, and used to

These two additional arms are called the tentacles.

Cuttlefish are often quite curious, and sometimes come right up to my camera for a look.

Their skin patterns change rapidly thanks to skin cells called chromatophores.

At the New England Aquarium in Boston, there's an exhibit where you can watch cuttlefish

And when you look carefully, you can see the chromatophores working.

At feeding time, the cuttlefish pay close attention, and they turn on the camouflage.

Even slowed down to one quarter speed, it's lighting fast.

With a high speed camera, a flamboyant cuttlefish blah blah

In another tank, a Giant Pacific Octopus guards it eggs.

Back in Indonesia, the Coconut octopus is releasing thousands of baby octopus hatchlings

She carried them around for months while they incubated.

The Atlantic Longfin squid lays its eggs like most squid…cigar shaped bundles of eggs

attached to the rocks or kelp and left to fend for themselves!

The Flamboyant Cuttlefish eggs are about the size of a pea--laid on a rock.

The cephalopods are an amazing group of animals.

It's hard to imagine such advanced animals being closely related to such primitive mollusks

Cephalopods can change color and texture with chromatophores, they have extremely sharp

eyesight, multiple arms that are capable of complex tasks, and they are clever enough

They are definitely one of my favorite inhabitants of the Blue World.

字幕リスト動画再生

スーパー吸血鬼。頭足類！？| ジョナサン・バードのブルーワールド (Super Suckers: Cephalopods! | JONATHAN BIRD'S BLUE WORLD)

sophisticated

extremely

evolve

convince

スーパー吸血鬼。 頭足類！？| ジョナサン・バードのブルーワールド (Super Suckers: Cephalopods! | JONATHAN BIRD'S BLUE WORLD)

sophisticated

extremely

evolve

convince

スーパー吸血鬼。頭足類！？| ジョナサン・バードのブルーワールド (Super Suckers: Cephalopods! | JONATHAN BIRD'S BLUE WORLD)