Why do spiders build webs on rainy days?

On a rainy day. Spiders begin to crawl their webs to catch insects, which is a sign that the sky will get better. Instead, the spider receives a web, indicating that it will rain. Scientists have found that spiders can ** weather, mainly because of its humidity on the air.

Changes are very sensitive. It turns out that the spider has many small silks on its tail, and the silk parts are sticky and cool.

When the rain comes, due to the high humidity of the air, water vapor.

In large quantities, the water vapor tends to condense into tiny droplets on the spider silk, so when the spider feels that it is difficult to rotate, the silk stops. And the net is closed. Conversely, when the air humidity becomes less and the weather improves, spiders can smoothly spin their webs to catch insects without the interference of small water droplets.

On rainy days, when the air pressure is low, the spiders will come out, so they should build a vertical web before the rainy day, because the flat spider web is easy to be smashed by the rain, and the rain can flow down the vertical spider web, and the spider web is not easy to be destroyed.

It won't be like this, it's a rainy day to close the web, and the spider is very smart. There are spiders forming webs, and it will be sunny after a long rain. When the air is dreary and humid in the rain, the spiders will hide when it is difficult to build webs, and when the air becomes dry on sunny days, the spiders will start to build webs again.

The spider closes its web before it rains, and it collects it into a small ball and eats it. The specific reason I estimate is that the rain will destroy the web, and in order to reduce the loss, the spider eats the web to replenish the protein it consumes by spinning.

Spiders began to build webs hundreds of millions of years ago Scientists in Spain discovered 100 million years ago.

Amber, Evidence for Spider Evolution Welcome to my 'living room'. A Cretaceous spider grinned.

Flies send out invitations. This is not a fantasy. The US magazine "Science" published on 23 June said that scientists had discovered a piece of amber 100 million years old in Spain. Genetic studies suggest that spiders may have formed webs hundreds of millions of years ago. Amber contains 26 sticks.

Spider Silk David Greer Madi is.

American Museum of Natural History.

of a researcher. A few days ago, he and his colleagues found a clear piece of "spider predation" amber in Spain. Amber contains 26 intertwined spider silks, slime.

Still clearly visible, a small worm.

A fly, a fly.

A wasp and a beetle are trapped in it. The value of this piece of amber lies in the fact that it is extant containing cobwebs and.

The oldest fossil of prey. Greer Madi explained to a Reuters reporter in an interview, "Compared to other fossils, it.

It's small, but you can read a lot of details out of it. Through analysis, Grell Madi's research team finally concluded that the spider was back in.

Evolution was completed long before the human imagination, and "it is clear that the 'fisherman' history of spiders is long, long." Scientists have also theorized that spiders are likely to have an early flight due to their increased predatory ability.

Insect evolution has played a huge role in driving this. Spiders that weave round webs are the smartest Another article published at the same time gave a genetic explanation for the time when spiders completed their evolution. For circular nets are originating from.

Ghost-faced spiders and. The two-origin theory of the golden spider, California.

University Researcher.

Jessica Gabe and his colleagues extracted from two species of spiders.

Weave the genes and compare them in order. On this basis, they postulated that the ghost-faced spider and the golden spider were created in the body.

The genes of spider silk evolved at the same time, and the evolution of modern web-weaving spiders can be traced back to 100 million years ago or even earlier. In other words, as early as the Cretaceous period, when dinosaurs were "in power", spiders had learned to build webs to hunt. This coincides with Greer Madi's discovery.

The circular web has been hailed as the pinnacle of a spider's ability to adapt to change. Gabe refutes the two-origin theory in his **, "Our research proves that not only do circular webs have a long history, but that in the process of evolution, some spider species gradually lost the ability to form circular webs. That's why the "black widow" spider can only weave a web that has no arc features and is completely "messy".

Hello, spiders generally build webs in the morning, spiders are arthropods, all spiders have silk glands, and silk is very useful in the life of spiders. Spreading the net to catch insects is one of the functions of spider silk. Nomadic spiders have no fixed habitat, they hunt everywhere and do not weave webs, only sedentary spiders weave webs.

The purpose of forming a network is to protect oneself, but also to survive.

The most important characteristic of a web-forming spider is its web-forming behavior. Spiders secrete mucus through protrusions at the tip of the silk sac, which when it comes into contact with air.

It can be condensed into very fine filaments. Webs made of silk are highly sticky and are the main means of predation for spiders. For insects that stick to the net, spiders will first inject a special liquid jujube digestive enzyme into the prey.

This digestive enzyme causes insects to stun, convuls, and die, and liquefies their bodies, which feed spiders by sucking. Spiders are oviparous, and most male spiders are devoured by female spiders after mating with female spiders, becoming food for female spiders. Loitering spiders, on the other hand, do not build webs, but wander around or camouflage in place to hunt prey, such as the tall spider, which is commonly known in Taiwan (worm na) (worm forehead).

Before the rain, the air pressure is at the bottom, and the spider feels it, so it rushes to build a vertical web before the rain, because the flat spider web will be easily washed away by the rain, if there is no new web, not only can not catch the mosquitoes to starve, but also they will be homeless after the rain. Conversely, if we find spiders weaving vertical webs, it is a sign that it may be raining.

Bugs will come! Because there are a lot of bugs after the rain.

Feng Shiyu in the fourth class.

Once, when I came home from school, I saw a spider pulling a web in the corner, and I stood there and thought: doesn't he have a web, why should he pull it? Is it to pull the net for its children?

Thinking about it, it started to rain. I braved the rain and hurriedly ran home, I told my mother about the spider pulling the net for his child, and the mother smiled and said, "The spider pulls the web not necessarily for its children, the spider's children can also pull the web!"

After a while, the heavy rain stopped, and I went back to the place where the spider pulled the web, and I saw that the spider was there to shelter from the rain. However, I don't know why it rains after the spider pulls the web, is it a coincidence, I went home and read many books, and I realized that the spider has a function, it can know when it rains. He knew that when it was going to rain, he would pull a net in the corner of the wall where it would be sheltered from the rain so that it would not get caught in the rain.

It would be nice if we had such a feature as well.

Although this is just a small discovery by chance, it has taught me a truth, that is, as long as you pay attention to every thing around us, whether it is animals or plants, you will have a great discovery that others can't think of.

After the rain! Hey? How would Dad know it was going to rain?

I asked my dad with curiosity, and he said: don't rely on others for what you do, rely on yourself to do it, and believe that you can master more knowledge by yourself. So, I decided to do an experiment.

The weather forecast says it will rain tomorrow afternoon. My head slammed to the ground, wasn't Dad looking at the cobwebs in the trees at dusk? It definitely has something to do with cobwebs.

The next afternoon, I took an umbrella and ran to a tree, and saw a spider building a web that had been abandoned by the spider. I looked at it, and the spider was a vertical web. After a while, the cobwebs were knotted, and then it began to rain, and I held up my umbrella and looked closer, and the horizontal web was broken, and the web where the spider was lying was intact.

I understood at once: it turned out that before the rain, the spider felt damp and knew that it was about to rain, and he was afraid that his home would be destroyed by the rain, so he would be homeless. So, the spider built a vertical web as its home, and the vertical web could not be drenched by rain, so of course the spider was not afraid of being homeless.

At that moment, I exclaimed: the charm of nature is endless! I told my father what I had discovered, and he praised me for being a smart child, and my heart was sweet, because I had another knowledge in my brain.

When it rains, the net breaks. It wants to weave vertical nets indiscriminately.

Spiders look scary, but spiders are good friends of humans, and they can destroy pests by building webs, does that mean that all spiders build webs? Here's what I brought to you Do all the spiders build webs? , I hope it can help everyone!

Most spiders build webs to hunt, but there are some'Spiders do not build webs. Most spiders that do not build webs do not have a fixed dwelling, and when they find their prey, they will quickly bite the prey with their fangs and inject venom before eating the prey.

The tarantula does not form webs, it lives under the ground. Its abode has more than one "room"; There are bedrooms, "nurseries", and an emergency exit. And the walls of each "room" are glued with "wallpaper" made of spider silk, which is slippery and soft.

Tarantulas will use spider silk to stick some bark and leaves to make a small lid to cover the hole. When hunting, it hides the entrance of the cave and hides itself underneath, sneaking up on the small insects that pass by, almost hitting every shot. That's why people call it the "trap spider" again.