Among other species, trapdoor spiders have a pretty long life span from five to twenty years, and only the females make a nest, whereas males go out in the open hunting and looking for a mate. The bites of these spiders are not dangerous, though sometimes nasty symptoms may appear: itching, swelling and even pain are among the most frequently encountered. The Brown Recluse Spider Brown recluse spiders, also known as the fiddle-back spiders or the violin spiders are America's most widely-spread and harmless arachnid species. They are found almost everywhere on the North American continent except the area at the west of the Rocky Mountains; what seems even more interesting is the fact that a variety of brown recluse spiders is also found in Hawaii. The hobo spider waits in a tubular retreat until the prey is tangled in the threads and only then it comes out and injects the insect with the paralyzing venom. The common prey of the hobo spider includes carpet beetles, earwigs, houseflies and silverfish. The hunting habits are the same regardless of whether we are talking about the hobo spiders that live indoors or out in the fields, gardens and hedges. Funnel Web Spider The funnel web spider is normally found in the southern hemisphere, particularly Australia, both in coastal and highland areas. Though the generic name of the funnel web spider is used most of the time, it includes no less than thirty-six species that live both on land and in trees. Inevitably, you will get into contact with a spider sooner or later, either indoors or outdoors; the general tendency is to destroy their nests inside of our homes since we associate cob webs with a messy and unclean area. Last but not least, certain spider species are a real threat to humans by the damage their venom can do to us. Even in North America there are three different types of the black widow spider and their classification is made according to the geographical area where they live: there is the northern black widow, the southern black widow and the western black widow; thus the species is widely spread from the south of Canada to Mexico.