Geographical Range Southern and central United States
Habitat Various habitats; found in undisturbed areas in and around houses and other buildings; found outdoors under rocks and logs
Scientific Name Loxosceles reclusa
Conservation Status Common

As its name suggests, this spider prefers dark, out-of-the-way hiding places. But shy as it is, the brown recluse can inflict a serious bite. Problem is, normally you don't even feel the bite until your body reacts to the venom hours later.