8 Most Dangerous Crustaceans in the World

今回は、いかにも面白そうな最も危険な甲殻類８選を見てみましょう！

00:40
And the reason I wanna find and present these frogs to you today is

まず1文目

And the reason I

the reason の後に I が来たので、

・どんなreasonなのかの説明が始まったこと

・どこかでisが来て、そこまでが主語になること

が予測できます。

それでは今日もYouTube英語学習を楽しんでいきましょう！

00:00
hello everyone since ancient times man
00:03
has eaten
00:04
all kinds of underwater creatures fish
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shellfish and arthropods but people have
00:09
special preferences for crustaceans
00:11
this group of sea creatures is
00:12
considered a luxury food in fact three
00:14
quarters of the world's first cookbook
00:16
ever consisted of recipes based on
00:18
crustaceans today the meat of these
00:20
creatures
00:21
rich in protein and almost calorie free
00:23
is a main ingredient in many national
00:28
cuisines
00:32
crabs crayfish shrimp and lobsters are
00:34
consumed in france spain
00:36
portugal japan and many other countries
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however
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among the 72 000 varieties of these
00:42
creatures the percentage of crustaceans
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that are consumed by humans is quite
00:45
small because there are many dangerous
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strange and frightening species you want
00:50
to see them that's we're going to show
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you today let's get it on
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mantis shrimp look at this strange
01:02
creature it is the mantis shrimp and it
01:04
stands out from its peers not only by
01:06
its brilliant appearance but also by its
01:08
combat skills this creature lives in the
01:10
tropical
01:11
and subtropical marine habitats and most
01:13
of the time it hides among the coral in
01:15
many cases mantis shrimps do not come
01:17
out of their burrows to catch their prey
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because they really don't like to leave
01:21
their home the mantis shrimp's hunting
01:22
method
01:23
is an amazing show to hunt crabs
01:26
shellfish snails or even
01:27
fish this creature uses a sharp
01:29
spear-like appendage the force and speed
01:31
of impact
01:32
according to some reports is comparable
01:34
to that of a 22-caliber
01:38
bullet
01:41
that's why managed shrimps often attack
01:42
animals larger than themselves as their
01:44
powerful limbs break even the strongest
01:47
shells some large individuals can even
01:49
break a sheet of glass
01:50
after one or two hits these creatures
01:52
also have a very complex
01:54
eye structure they're able to
01:55
distinguish between 12 basic colors
01:57
in comparison humans can only
01:59
distinguish three
02:01
palm thief if you watch our video in the
02:04
dark
02:04
you're about to feel the shivers the
02:06
next creature could star in a species
02:08
about some
02:09
freaky monsters
02:15
look at it it's huge the coconut crab
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also known as palm thief normally weighs
02:20
about 4 kilograms and is
02:22
considered the largest arthropod species
02:24
on earth but that's not what makes it so
02:26
special this crustacean is widely known
02:28
for its unusual manners because
02:30
apparently
02:31
it loves to steal if it finds a spoon a
02:34
fork or anything shiny
02:36
it'll take it and store it in its burrow
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in fact the coconut crab loves to steal
02:40
anything it finds even if it's not
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edible this creature's diet is usually
02:44
vegetarian it loves coconuts more than
02:47
anything else in the world in order to
02:48
get food the crab
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climbs to the top of the palm tree where
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it chops off its dinner with its
02:53
powerful claws
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in most cases the coconuts break when
02:56
they fall to the ground yeah
02:57
for some reason this crustacean's claws
02:59
aren't strong enough to break the
03:00
coconut however they are powerful enough
03:02
to climb up a tree trunk
03:04
or even bite off a person's finger by
03:06
the way if the crab falls along with the
03:08
coconut nothing terrible will happen
03:10
it can survive a fall from more than
03:11
four meters high without a scratch
03:13
coconut crabs also enjoy other fruits
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but they can also snack on newborn
03:17
turtles
03:18
carry on and even rats pistol shrimp
03:22
this crustacean lives in tropical and
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middle latitudes and it seems quite
03:26
harmless at first sight but don't let it
03:28
fool you pistol shrimps are very
03:30
dangerous predators
03:33
this creature kills its victims by using
03:35
its own claws in a very unusual way
03:38
no it doesn't rip its prey into pieces
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that would be too boring the fact is
03:42
that evolution has given the pistol
03:44
shrimps an
03:44
incredible built-in stun gun to hunt the
03:47
predator first sticks out its antenna
03:49
from the barrow
03:50
with their help it can feel its victim
03:52
coming closer when the prey is near the
03:54
crab
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jumps out reveals its huge claws and
03:56
immediately makes a 180
03:58
or even 190 decibel sound with it
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this is several times louder than the
04:08
noise created underwater by a motorboat
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the victim is instantly stunned and the
04:13
crab pleased with itself
04:14
drags it back to its burrow in theory
04:16
this attack could stun
04:18
even a person at close range take a look
04:20
at the mechanism of this stun gun this
04:22
powerful sound is not caused by physical
04:24
contact between two parts of the claw
04:26
but by the so-called cavitation
04:28
in other words an instant clap from the
04:29
claw produces a powerful jet of water
04:32
at the same time many bubbles appear and
04:34
burst immediately all this creates the
04:36
loud sound
04:38
chinese mitten crab this sea dweller
04:41
originally
04:42
lived in the yellow sea and the
04:43
freshwater lakes of china but a little
04:45
over a hundred years ago it accidentally
04:47
traveled to the seas of europe and it's
04:49
unlikely to leave
04:50
the fact is that the shanghai crab is
04:52
remarkably fertile
04:53
in a very short period of time these
04:55
creatures can colonize huge areas of
04:57
both fresh and salt
04:59
water but that's not the only problem
05:00
crabs of this species usually destroy
05:03
other fish
05:03
and eat their caviar this can severely
05:06
impact any ecosystem
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in addition chinese mitten crabs can dig
05:10
very elaborate burrows
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sometimes they do it near dams and other
05:13
hydraulic structures
05:18
[Applause]
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can you imagine the catastrophic
05:25
consequences this can have
05:26
and if that weren't enough the meat of
05:28
this crab is also deadly to humans
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this creature carries long flukes that
05:32
affect the lungs and the brain
05:33
you can get infected if you eat poorly
05:35
prepared or raw crab
05:37
and although this creature is considered
05:39
a delicacy in china
05:40
we don't advise you to taste it noble
05:42
crayfish
05:44
you probably know that many people like
05:46
eating crayfish both as an appetizer and
05:48
a separate dish
05:49
according to some reports noble crayfish
05:51
were considered a delicacy in the middle
05:53
ages when it became popular among
05:55
swedish aristocrats
05:56
today crayfish is no longer considered a
05:59
luxury dish available only to the
06:00
wealthier class
06:01
the consumption of noble crayfish is
06:03
actually very common in eastern europe
06:05
where it's boiled in water added to
06:07
garnishes used in soups and cooked in
06:09
the oven
06:10
all of this of course sounds delicious
06:12
if it weren't for a little problem
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like other scavengers crayfish often
06:16
carry dangerous diseases
06:18
such as typhoid and hepatitis a that's
06:20
why they should never be bought from
06:21
illegal vendors who can't prove where
06:23
they got their product
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if you want to enjoy this dish we advise
06:26
you to buy crayfish exclusively from
06:29
certified markets there the possibility
06:31
of buying infected arthropods is
06:33
virtually non-existent
06:35
american lobster what do you think of
06:38
this ocean dweller this huge creature
06:40
that lives in the waters of the atlantic
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weighs about 20 kilos
06:43
probably best not to mess with it huh
06:45
that's right look at the size of its
06:46
claws
06:47
one is to crush the victim and the other
06:49
is to chop them up if you're not careful
06:51
enough one of your hands can end up in
06:53
its claws
06:58
but this isn't the whole list of unusual
07:00
features of the american lobster whose
07:01
tails are served in fancy restaurants
07:11
for example this beast's teeth are
07:13
located in its stomach but the stomach
07:15
in turn is right in the mouth in
07:17
addition the american lobster can grow
07:19
new limbs or claws to replace old ones
07:21
looks like we found a real superhero
07:23
among crustaceans
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floral egg crab real crab meat is an
07:30
expensive and exquisite delicacy that's
07:32
not available to everyone
07:34
of course we're not talking about cerimi
07:36
which is usually added to rolls and
07:37
other dishes to imitate crab meat we're
07:39
talking about real treats like snow
07:41
crabs or king crabs however
07:43
not all crustaceans of this class are
07:45
safe to eat some of them may contain
07:47
lethal doses of toxins for example the
07:50
floral egg crab
07:51
which lives in the indo-pacific region
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the most interesting thing is that these
07:55
crabs do not produce the saxotoxin and
07:57
tetrodotoxin
07:58
found in their bodies but obtain it
07:59
through food this means that throughout
08:01
their lives these creatures accumulate
08:03
it in their bodies
08:04
so eating them can end up in a tragedy
08:13
after all even half a milligram of any
08:15
of these poisons can kill an average
08:17
adult
08:18
and worst of all the toxins are also
08:20
resistant to high temperatures
08:21
so even the most thorough processing and
08:24
preparation methods cannot completely
08:26
eliminate them and not many cooks can
08:28
skillfully remove the poison from a
08:29
crab's body as they do in japan with the
08:32
fugu fish
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so the best advice regarding this crab
08:35
is not to eat it
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spider crab do you remember the scene in
08:39
harry potter
08:40
in the chamber of secrets where harry
08:41
and ron are running away from a bunch of
08:43
terrible spiders led by aragog
08:49
it's actually very similar to what
08:51
you're seeing on the screen right now
08:52
although this video was shot in real
08:54
life
08:55
and underwater this is the japanese
08:57
spider crab
08:58
a species that makes everyone shiver
09:00
here they are in the process of mass
09:02
migration
09:03
and it looks like the advent of a huge
09:06
army
09:14
the most important reason why you might
09:16
fear these arthropods is their
09:18
incredible size the lake span of spider
09:20
crabs can reach 2-4
09:22
meters and they weigh about 20 kilograms
09:24
the internet is full of scary stories
09:27
about these creatures eating a child
09:29
but to be fair that's impossible
09:30
probably in fact spider crabs are very
09:33
harmless to humans
09:34
unless of course they're disturbed
09:36
experts argue that the meat of young
09:38
spider crabs is an exceptional delicacy
09:40
however their production is almost
09:42
non-existent the fact is that these
09:44
crustaceans often live at great depths
09:46
making them difficult to catch and not
09:48
very profitable that's all for today
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see you soon