There are many kinds of spiders. but we have seen very few. The common garden-spider spreads webs on the trees and bushes in the garden. The house-spider builds its web inside the rooms,and these are the "cob-webs" that hang on the ceiling.
There is a water-spider that lives and builds it' s nest in ponds. The trap door spider does not weave an ordinary web, but makes a very clever little trap with a drop-door to it. All the spiders use poison to kill the flies they catch. But only one can hurt the human beings, and it's called Tarantula. Most spiders quite harmless, though people are afraid of them. 
The natural food of spiders is flies and small insects. Spiders build the webs for the purpose of catching flies. The spider web is not a nest to live in,but a trap to catch foods. Web is like a net. It's a wonderful creation in nature. The spiders has inside it a kind of gum, which it spins into very fine silky thread.
When a fly come along and flies into the web, it can't get away because threads are sticky and hold it fast. The more it struggles, the more mixed it gets. And at once the spider runs out over its web, seizes the fly, squirts poison into it and kills it. Then it sucks all the juice out of its victim.After it's finished the dry body of the victim is thrown away. Then the spider mend the web again if it has been broken and awaits for the next victim. 
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