I caught a little spider from the corner and put it in a box (with holes around it and glass on it for easy observation). Before the spider could weave the web, I picked up some dead bugs and put them in front of the spider The spider ignored them, then hit the box with her hand, and the spider crawled in other directions.
In order to find out whether spiders eat dead insects thoroughly, the next day, I came to the box to observe and saw that they were still in their original places, except that there was a net in the corner of the box, and the spider was lying quietly on the net. At this time, I wondered: yesterday, the worm didn't eat it because there was no net, so I picked up the dead fly and put it on the net gently, but the spider still didn't move. Then, I gently touched the edge of the net with my pen. Gee, the spider seemed to have a reaction and began to crawl in the trembling direction. I took the pen back, the net stopped shaking, and the signal was broken. It stopped soon. I touched the dead fly's body on the net with the pen tip again, and the net began to vibrate, and spiders began to crawl here. I took back the nib again and the spider stopped. Like last time, after a while, the spider climbed to the center of the web again. Oh! I finally understand that spiders feel by the vibration of their webs and prey by weaving them.
In order to prove that spiders feel through the vibration of their webs, I did another experiment. Put the pen tip on the dead fly on the internet and vibrate for a long time, and the vibration of the web page is getting bigger and bigger. Spiders seem to feel stronger and stronger. Spiders will come in a hurry, and when they meet bugs, they will take back the pen tip. Only the spider's tail will soon spit out sticky silk to kill bugs, and then look at the spider's back, as if sucking flies. Soon, a complete shell will be left on the Internet. This experiment proves that spiders eat moving insects.
After these experiments, I went to the library and bookstore to look up many books about spiders. Among them, General Zoology wrote that spiders are carnivores, and their food is mostly insects or other arthropods. But the mouth has no upper jaw, so you don't swallow solid food directly, but suck it slowly. When insects and other animals come into contact with the net, they will struggle desperately on the net to make the net silk vibrate, so that spiders will find it soon. Spiders will crawl along the longitudinal silk to their prey, wrap the prey with spider silk and fix it on the net. First, the venom secreted by poisonous glands in claws is injected into the captured prey to kill it, then the digestive enzyme secreted by midgut is injected into the captured tissue torn by claws, which is quickly decomposed into juice, then inhaled into digestive tract, and finally eaten the remaining body shell. These fully prove that flying insects make the spider's web vibrate, and the web vibration will make it feel, and the spider will catch its prey if it feels. So it is confirmed that spiders only eat live animals, not dead insects.