What is the weather for spiders to weave (knot) webs? What kind of behavior? Why does it weave a web? How do you knit?

Spiders, also known as networms, flat spiders, orchard spiders, octopus, campytheca and Boss, are the most abundant predatory natural enemies in terrestrial ecosystems. It is distributed all over the world except Antarctica. So what is the weather for spiders to weave webs? What kind of behavior? Why does it weave a web? How do you knit?

What is the weather when spiders weave webs?

There is an old saying, "if a spider webs a web, it will be sunny for a long time", which means: on a rainy day, spiders begin to open their webs to catch insects, which indicates that the weather will turn sunny; on the contrary, when spiders pull in their webs, it will rain. So why do spiders have this ability to predict the weather? Scientists have found that spiders can predict weather mainly because they are sensitive to changes in air humidity. It turns out that there are many small silk spinner at the tail of the spider, which is both sticky and cold. When overcast and rainy days come, due to high air humidity and much water vapor, water vapor is easy to condense into small water droplets on the spider's silk spinner, so the spider finds it difficult to spin silk, so it stops spinning and draws in the web. On the contrary, when the air humidity becomes smaller and the weather gets better, without the interference of small water droplets, the spider can successfully spin silk and open the net to catch insects.

What is the behavior of spiders weaving webs?

Physical behavior is divided into congenital behavior and learning behavior. Congenital behavior refers to a kind of behavior that animals have at birth, which is a kind of instinct of animals, which is determined by the genetic material in the body. Spider web-weaving behavior is a kind of instinct of animals and belongs to congenital behavior.

Why do spiders weave webs?

Opening a net to catch insects is one of the functions of spider silk. Hunting spiders have no fixed habitat, hunting everywhere, do not weave cobwebs, only settlement spiders can weave webs. Netting is not only to protect themselves, but also to survive.

The most important feature of web-forming spiders is their web-forming behavior. Spiders secrete mucus through protuberances at the tip of the silk sac, which condenses into fine silk when exposed to air. The web made of silk is highly sticky and is the main means of predation for spiders. For insects that stick to the Internet, spiders first inject a special liquid jujube digestive enzyme into their prey. This digestive enzyme can make the insect coma, twitch, until death, and liquefaction of the body, after liquefaction, spiders suck food. Spiders lay eggs. After mating with females, most male spiders will be swallowed by females and become food for females. Wandering spiders do not form webs, but wander around or prey on the spot, such as high-footed spiders, commonly known in Taiwan as worms.

How do spiders weave webs?

From its foothold on a tree, the spider draws many filaments long enough to reach the opposite side, so the silk floats with the wind, like transparent ribbons floating in the air, and then it always touches the fixed point of the silk with its feet. If there is a silk that can not be pulled, then the silk has been entangled in the tree opposite, and the "heavenly rope" has been set up. Like the pillars of a house, it sticks a few more strands back and forth on the support line that must be used as a spider's web, turning it into a thick "cable". Then, under this thick "cable", a second "cable" is erected in parallel. The spider crawled around, and the web was set up on these two "cables".