Despite their incredible diversity, all spiders create silk and design complex webs in which they catch their prey, nevertheless, silk is also great for climbing and laying eggs. All spiders depend on their venom for survival: venom is the way to hunt and defend themselves, but from the many thousands species only about two hundred actually represent a threat for human health. The Harmless Domestic Spider The hobo spider, also known as the funnel web spider, the hobo spider is a harmless species that lives both in Europe and on the North American continent. The specificity of the hobo spider is related to the way it weaves its web: the funnel-shaped nest is the perfect structure to wait for prey in. 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 largest wolf spider will not be more than two inches in length, but on a common basis their size is variable and lower. Typically hairy, the wolf spider can be brown or gray with all sorts of markings and lines on the back and the abdomen. The special thing about these creatures is the way the females carry the egg sacs with them, and once the eggs hatch, the siblings remain attached to their mothers' back until they are large enough to detach and start a life on their own. It is not unusual to misdiagnose various skin infections as brown recluse spider bites, since the symptoms are very often miscellaneous. Statistics show that 80% of the brown recluse spider bites are misdiagnosed. A test has been created to identify the wound and the venom type, but the practice is not part of the medical routine yet. There is a paradox related to the qualities of the brown widow spider venom: when compared to that of the black widow it is twice as potent. Surprisingly enough, the death risk is a lot lower with this species; the explanation for this queer fact lies in the shy nature of the brown widow spider that injects venom timidly unlike the black widow.