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Spiders have lived among humans for centuries, and most of the species do no harm. Interestingly, many species of spider are actually beneficial to the environment, namely as a predator to reduce the number of pest control Although some spiders have venomous bites, but only a few of them prove to be medically dangerous. In the United States, widows and ascetic spiders are examples of species that pose a health threat to humans if they are bitten.