What If You Get into the Biggest Spider Web in the World

今回は、巨大なクモの巣があったら、という科学のお話です。

蜘蛛の糸がとても強靭というのは有名な話ですが、それが人間サイズだったらどうなるのでしょう？

リアルなクモの映像も多いので苦手な方は注意！

でもこの動画で1500いいねなんですね。。

それでは今日もYouTube英語を楽しんでいきましょう！

00:09
i don't mean to bug you but
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spider silk is one of the most durable
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natural materials on the planet
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kevlar of which body armor is made is
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weaker than the stuff
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spiders produce inside their bodies it's
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hard to believe
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because if you've ever touched the
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spider web you realize you can easily
00:27
break it
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that's because spiders secrete a very
00:29
thin layer of silk
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most metals would break in no time as
00:33
well at such
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thickness the good news is that there
00:36
are no huge spiders on our planet
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which means you can't get stuck in their
00:40
trap the bad news
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is that if thousands of spiders with the
00:44
strongest silk in the world
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join together and weave a single big web
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well
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you're in trouble the most durable silk
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belongs to darwin's bark spider
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its silk is twice as strong as that of
00:57
other species
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the spider is much smaller than most of
01:00
its kit but this doesn't prevent it from
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being one of the most formidable
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predators in the world
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the area of its web reaches 30 square
01:08
feet
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and it's suspended over rivers on
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incredibly long lines
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the female spider shoots a stream of
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silk which is caught by winds above the
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moving waters
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and carried to the other bank where it
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attaches itself to a tree or a bush
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the distance could easily be over 80
01:25
feet
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you can find this natural wonder only in
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the tropical jungles of madagascar
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imagine that several hundred darwin's
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barked spiders spun a thick web over a
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river
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you're going downstream in a kayak at
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the same time
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from a distance you don't notice the
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huge trap and when you finally do
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it's too late you get caught in the silk
01:48
the kayak goes out from under you
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you hang in the air thousands of web
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strands
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vibrate and give the spiders a signal
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that their dinner is here
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you don't have a dagger or a machete to
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cut yourself free
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the first thing you need to do is save
02:03
your strength and energy
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the more you resist the more entangled
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you get
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the fact is that the spider's web is
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sticky the more you move
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the more glue gets on you slowing down
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your movement
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by the way there is a group of the
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triple eight spiders whose web is
02:21
completely dry
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but the threads are surrounded by clouds
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of ultrasound fill
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if the prey begins to move these clouds
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come together
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and become stronger entangling the
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insect even harder
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when insects get caught in a spider's
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web spiders
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especially small species don't
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immediately run up to the prey
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they are waiting for it to lose all
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strength to resist
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after that spiders carefully approach
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the dinner and spit out digestive liquid
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with venom
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which means that the digestion process
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begins not inside but
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outside the spider then the hunter wraps
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the body of the insect with silk
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to form a cocoon inside which the prey
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is digested
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after that the spider drinks back its
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digestive fluid with the food
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the process can be repeated several
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times well let's hear it for recycling
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now back to you stuck in a big web you
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realize all these terrible events that
03:17
are about to happen
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and your brain begins to work as quickly
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as possible
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from all sides hundreds of small spiders
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are running towards you
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looking forward to their meal your time
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is running out
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but then a solution strikes you you
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wriggle out of your clothes and fall
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into the river
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yeah you're almost naked in the jungle
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of madagascar
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but it's much better than becoming a
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dinner for spiders
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you're watching as the arachnids climb
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up on your clothes
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and wrap it in a cocoon now about those
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piranhas
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just kidding some spiders use a strong
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venom that penetrates the insect's body
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and dissolves it from inside but the
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worst
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fate awaits an insect that gets caught
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in the philippineella vesina spider
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territory
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these spiders don't have venom at all
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when a small insect gets
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into their web the hunter quickly runs
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up to the prey
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twists it pulls the silk out with its
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hind legs and wraps the insect in it
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the spider spends a lot of silk up to
04:19
460 feet
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that's twice the length of a passenger
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bowing the spider turns its prey
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28 000 times during the wrapping the
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insect is literally squeezed under such
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pressure
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after this the spider secretes digestive
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fluid
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inside this cocoon and well you get it
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yeah dinner is served the web serves
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not only as a trap for insects it's the
04:44
eyes and ears of spiders
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nearly all spiders have weak eyesight
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despite having six or eight eyes
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we humans can immediately see if a
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little fly is caught in the web
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but the spider doesn't know this it
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touches the strands of the web with its
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eight legs
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and feels for vibrations that tell it
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where the prey is
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or where the web is damaged also the
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smallest silk vibrations tell the spider
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about the humidity of the air or the
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presence of wind
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the spider can distinguish the slightest
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change in the structure of the web
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like a musician who hears an instrument
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is out of tune
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or doesn't hit the right notes i said
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nearly all
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spiders don't see well because some
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species can't see much
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better than humans one of them is a
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jumping spider
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their vision allows them to see colors
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that people can't
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but this spider is also interesting
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because it doesn't weave a web for
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hunting
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it sits and waits for its prey when a
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fly or beetle lands on a flower nearby
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the jumping spider leaps at it and bites
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it with its sharp fangs
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this small predator can jump up to 50
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times the length of his body
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it uses silk as an insurance cable to
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soften the fall
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avoid falling on the ground or return to
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the original position if it couldn't
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catch the prey
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but you should not be afraid of them
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because jumping spiders are actually
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cute
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and many people even keep them at home
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as pets
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some species of spiders use silk to
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travel long distances
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they shoot strands of it like one famous
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superhero
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and use them for climbing others use
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wind instead
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their silk is so light that the wind
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blows it away with the spider
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you could say such spiders can fly
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and then there are wolf spiders they
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don't jump or
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weave instead they run after their prey
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making them the sprinters of the spider
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world
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unlike jumping spiders wolves are bigger
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and look quite scary
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when they catch up with their prey they
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inject it with venom
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but the worst thing is that these
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spiders have adapted to live in any
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conditions
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from cold mountain peaks to hot deserts
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and rain forests
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people who fear and hate spiders should
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remember that these creatures control
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the insect population
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without spiders the number of insects
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will increase dramatically
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and all agriculture will be threatened
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wheat corn vegetables and fruit may
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disappear
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resulting in a global food crisis
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remember this when you want to hit a
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spider with a slipper
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there are about 45 000 known species of
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spiders that live
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all over the world but some scientists
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believe there are twice as many species
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that we don't know
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anything about yet