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Brown recluse spiders are one of the few venomous spider species native to North America, primarily found in the central and southern United States. They belong to the family Sicariidae and the genus Loxosceles. These spiders are characterized by a distinctive violin-shaped marking on their cephalothorax, with the neck of the "violin" pointing toward the abdomen. Adult brown recluse spiders measure around 6 to 20 millimeters in body length, and they have six eyes arranged in three pairs. They are typically light to medium brown but can vary from cream-colored to dark brown. Brown recluse spiders prefer secluded, dark environments such as woodpiles, sheds, barns, attics, basements, and closets. They build irregular, sheet-like webs with a small funnel-shaped retreat in the center for resting. These spiders are not aggressive by nature but will bite when disturbed or threatened. The venom of brown recluse spiders contains a necrotizing agent that can cause severe skin damage, leading to ulcers and tissue death around the bite area. In rare cases, systemic reactions such as fever, rash, nausea, and organ damage may occur, requiring immediate medical attention. Preventing brown recluse spider infestations involves sealing entry points in buildings, reducing clutter, and removing potential hiding places like woodpiles near structures. Insecticides labeled for spider control can be used to treat suspected habitats, but professional pest management services are often necessary to ensure effective removal of these elusive arachnids.