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Spiders and Spiders (order Araneae) are predatory invertebrate arthropod class Arachnida. They have eight legs and have neither wings nor antennae or masticatory patches in the mouth. Their eyes may be single or multiple. They secrete silk (a protein solution synthesized by glands usually located at the end of the abdomen) that is used to produce the thread that allows them to move, to weave their webs or cocoons trapping prey or protecting their eggs or young, or to make a provisional reservation sperm or dome allowing them to store air in fresh water. (Wikipedia)