Spiders come in many shapes, sizes, colors, and have many different habitats. Some spiders make tunnels in the ground with escape routes in case of intruders. Some spiders steal food from other spiders. Some use other spiders' webs. There is even a spider that knocks at the door of another spider's home and waits for acknowledgement before entering.
Spiders belong to the class Arachnida.
Horseshoe crabs are their nearest relatives, along with ticks, scorpions, and mites. Many people think spiders are insects, but spiders have eight legs instead of six, and they never have sings. There have been about 35,000 named spiders in the world to date with about two to three times that many waiting to be discovered. Spiders have a unique craft known as spinning - more precisely, spinning silk. This silk has many uses, but the best known is for their webs.