Spiders are athropods that have eight legs. Spiders are in the arachnids class, but not all Spiders are in the arachnids class. There are about 40,000 known species of Spiders. The spider silk is extremely strong and is used for many different purposes. Did you know it takes a spider an hour to make a web, they usually make webs every day. The largest a spider is the tarantula, the largest turantula is the Goliath birdeater.
