Whether indoors or outdoors, we can easily find cobwebs. Every spider web is made of very fine silk thread. These cobwebs can be used to catch flies, mosquitoes, beetles or other insects. The caught insects became spider's food. How do spiders weave webs?

Spider is a kind of rotating arthropod. The silk it weaves is so thin that it is hard to see clearly. If you look with a magnifying glass, you can see clearly.

The silk that weaves the web comes out of a small hole in the spider's tail. Scientists call this small hole a silk sac. Spider silk is secreted by the textile glands in spiders. This liquid will harden when it comes out of the spider's body and meets the air. Sometimes spiders need the help of their hind legs to spin silk. Spiders weave webs back and forth on the grass, branches or eaves. After weaving the net, it will nest near the net. Then, the spider hid in the nest, waiting to catch the worm that fell into the net.

Although the spider silk is very thin, it is actually very strong. It can stretch like a rubber band. When a bug falls into a spider web, the spider silk will stretch, but it will not crush the spider web. Strong winds can blow leaves and dust onto cobwebs, but they can't break them. If the spider web is broken, the spider will repair it carefully and quickly.

Spiders not only prey on insects with silk screens, but also protect themselves with silk threads. When you bounce the spider off the tree, it won't fall to the ground. It will spin silk and slowly fall to the ground, or swing back and forth on the silk thread, and then slowly climb back to the branches along the silk thread.