What weather does a spider usually spin its web in, the behavior and reasons behind it, and how it is done
Spiders are also called web worms, flat spiders, garden spiders, eight-legged hydras, xizi, and bosi, and they are the most abundant predatory natural enemies in terrestrial ecosystems. They are distributed all over the world except Antarctica.So what weather does a spider usually spin its web in? What kind of behavior is it? Why does it spin a web? How does it spin one?
What weather does a spider usually spin its web in?
There is a saying, “When spiders spin webs, long rain will surely clear&rdquo, which means: on cloudy and rainy days, when spiders begin to spread webs to catch insects, it foretells that the weather will clear up; on the contrary, when spiders take in their webs, it foretells that it will rain. So why do spiders have this ability to predict the weather? Scientists have found through research that spiders can predict the weather mainly because they are quite sensitive to changes in air humidity. It turns out that at the rear of a spider there are many small spinnerets, and the spinneret area is both sticky and cool. When cloudy and rainy days come, because the air humidity is high and there is a lot of water vapor, the water vapor easily condenses into small droplets on the spider's spinnerets, so the spider finds it difficult to spin silk and stops releasing silk and takes in its web. On the contrary, when the air humidity decreases and the weather improves, without the interference of small droplets, the spider can smoothly release silk and spread a web to catch insects.
What kind of behavior is web spinning by spiders?
Animal behavior is divided into innate behavior and learned behavior. Innate behavior refers to a type of behavior that an animal has from birth. It is an instinct of the animal and is determined by genetic material in the body. Web spinning by spiders is an instinct of the animal and belongs to innate behavior.
Why do spiders spin webs?
Spreading a web to catch insects is one of the functions of a spider's silk. Wandering spiders have no fixed dwelling and roam everywhere to hunt, and do not spin webs. Only sedentary spiders spin webs. They spin webs to protect themselves, and even more to survive.
The most important characteristic of web-spinning spiders is their web-spinning behavior. Spiders secrete mucus through the protrusions at the tips of their silk glands, and this mucus coagulates into very fine silk upon contact with air. A web made of silk is highly sticky and is the spider's main means of catching prey. For insects stuck on the web, the spider first injects the prey with a special liquid, digestive enzymes. These digestive enzymes can make the insect unconscious, twitch, and even die, and cause the body to liquefy. After liquefaction, the spider feeds by sucking. Spiders are oviparous, and most male spiders are devoured by the female spider after mating with her, becoming food for the mother spider. Ambushing spiders do not spin webs, but instead roam around or camouflage themselves on the spot to catch prey, such as the huntsman spider, known in Taiwan, China as.
How does a spider usually spin a web?
From its foothold on a tree, the spider draws out many long threads long enough to reach the opposite side, and so these threads drift with the wind, as if several transparent ribbons were floating in the air. Then, it constantly uses its legs to touch the attachment point of the spider silk. If one thread can no longer be pulled, then that thread has already become entangled on the tree on the opposite side, and the “sky rope” is set up. Like the ridge beam of a house, on this line set as the support line of the spider web, it goes back and forth sticking a few more threads, making it into a thick “cable&rdquo. Then, below this thick “cable&rdquo, it sets up a second “cable” in parallel. As the spider crawls back and forth, the web is set up on these two “cables&rdquo.