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Spider Definition & Meaning The greatest threat to spiders is habitat loss, although some spider species are also threatened by the pet trade. Spiders are arachnids, a class of arthropods that also includes scorpions, mites, and ticks. There are more than 45,000 known species of spiders, found in habitats all over the world. However, there has been debate among scientists about how families should be classified, with over 20 different classifications proposed since 1900. Spider Solitaire is similar to other types of solitaire (klondike, patience, etc.). The goal of the game is to create 8 stacks of cards (king-through-ace). Juveniles of some spiders in the families Anyphaenidae, Corinnidae, Clubionidae, Thomisidae and Salticidae feed on plant nectar. Laboratory studies show that they do so deliberately and over extended periods, and periodically clean themselves while feeding. These spiders also prefer sugar solutions to plain water, which indicates that they are seeking nutri