People who live in geographical areas that represent the habitat of venomous species tend to learn how to recognize the dangerous specimens and thus avoid coming into contact with them. The treatment for special spider bites can only be provided in professional medical institutions since the risk the victim faces in most such cases is necrosis. 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. This is the case with the house spider, the giant house spider and the hobo spider; they all live indoors, but only the latter is a real threat to humans, since its bite can cause necrosis. In order to avoid direct contact with spiders indoors, you can use special sticky traps that will drastically lower the risk of being bitten by a venomous species. In terms of gender relationships, male spiders are famous for being killed right after intercourse, or at least this is the general myth people know. Relatively smaller than the females, the male spiders of certain exotic species are indeed sacrificed for the perpetuation of their breed. Nevertheless, this is not a general rule as in most cases, both males and females survive the encounter. Many of the ointments prescribed for the alleviation of the pain caused by a spider bite are often ineffectual. Reactions to spider venom vary from one person to another, and the same rule stays valid for the treatment, which is why a remedy that has worked for a person is not necessarily going to be the perfect choice for another. 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.