Appearance: Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms. Size: Spiders occur in a large range of sizes. The smallest are less than 0.37 mm (0.015 in) in body length. The largest and heaviest spiders occur among tarantulas, which can have body lengths up to 90 mm (3.5 in) and leg spans up to 250 mm (9.8 in). Infestation Locations: Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exception of air and sea colonization. They usually choose spots that are dark and dry. They spin webs to catch food. They can live indoors or outdoors. They will live in trees, wet areas, dry areas, under the ground, or basically anywhere they want. Risks: Although spiders are widely feared, only a few species are dangerous to people. Most spiders will only bite humans in self-defense, and few produce worse effects than a mosquito bite or bee-sting. Most of those with medically serious bites, such as recluse spiders and widow spiders, are shy and bite only when they feel threatened, although this can easily arise by accident. About Spiders, along with daddylonglegs, ticks, mites, and scorpions, belong to the class Arachnida. They are beneficial animals that feed on all sorts of arthropods, including insects. About 3,000 species of spiders are found in the United States. Spiders rarely bite people, and most species found in the world are harmless. However, some people may be allergic to a spider’s bite, and a few species of spiders are known to produce bites that may have serious medical implications for humans. Two of the more medically important types are the black widow spiders, and the brown recluse spider and its relatives. Control An effective approach to spider control is to use the knowledge that they are predators; they primarily consume other insects. So if you can reduce the other insects around your home, spiders will be less interested in hanging around. Most spiders like to hang out near light sources, as they rely on flying insects that instinctively move towards light. The best way to control running and jumping spiders at home is to control their food sources around the house - again, get rid of your other bugs. Crack and crevice treatment with insecticides provide some control, but you can also use glue boards or sticky traps. DLM pest control can provide more information on getting rid of these pests. Please contact us to discuss options for eradication.