According to the Spider Encyclopedia, there are about 40,000 species of spiders in the world, and there are about 3,000 species recorded in China.

Spider's body is divided into chest and abdomen. There is a big chest plate on the abdomen, and a lower lip between the two frontal lobes in front of the chest plate. The abdomen is not segmented, and the abdominal stalk evolved from 1 abdominal segment.

Spider lifestyles can be divided into two categories, hunting and settlement. Hunter-gatherers are spiders that hunt everywhere. They have no fixed place to live, and they don't make webs, dig holes or build nests at all. Settled type, some netting, some digging holes, some nesting, as a fixed residence.