Spider is a kind of insect. They are also included in Arthropod phyla, together with crustaceans, insects, centipedes, centipedes, centipedes and other animals with clearly segmented bodies. Spiders can create powerful webs to catch prey by setting traps to trap them.
The spider has a central nervous system of all arthropods. Unlike most arthropods, spiders do not have extensor muscles in their legs and otherwise extend them with hydraulic pressure.