The huntsman spider is easy to be taken for a tarantula, but it is harmless to humans; it never bites unless provoked, and the wound is superficial and healing in just a couple of days. The size of the huntsman spider may seem impressive, as it has no less than three centimeters in leg-span. The legs of the huntsman spider are actually the characteristic element for the species: rather than having them attached vertically to the body, they are twisted, with a crab-like appearance. In geographical areas where poisonous spiders are known to live, people often learn how to differentiate them from the non-toxic species that are frequently encountered around the house. Very seldom would one take a photo or a drawing of a poisonous spider and try to compare it with a specimen identified in open air. The severity of spider bites is determined according not only to the species to which the aggressor belongs, but to the amount of venom that is injected by the spider. Thus, when a spider is trying to subdue its prey, the venom amount depends on the size of its meal, whereas, in a defensive venom release, the spider will do anything to protect itself and its nest. House species are the first to require proper spider identification since they are the first we come into contact with, and, on certain occasions, it is pretty difficulty to tell them apart. 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. 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. Brown Recluse Spider Bite Given the lack of aggressive behavior of the species in general, the brown recluse spider bite should be a trifle. Yet, things are not that simple since a mere exposure to the venom of this spider can trigger a whole range of very unpleasant reactions. As it seldom happens for a person to suffer from a brown recluse spider bite, many doctors have difficulties in diagnosing certain symptoms that accompany it, very often such a bite can be even taken for a staphylococcus skin infection that is very similar in manifestation and symptoms.