As many as 35,000 different spiders exist worldwide, with approximatley 3,000 living in North America. Many spiders are considered household/ structure infesting pests. All spiders are predators, feeding primarily on insects and other arthropods. In the United States only two spider groups are considered dangerous to man - The Black Widow Spiders and the Brown Recluse Spiders. Inspection, Identification, Sanitation and Exclusion methods are necessary in prevention and seeking control.