Wolf Spider A very common species, the wolf spider is the shy inhabitant of corners, basements and garages around our houses. Unlike most of its brothers, the wolf spider prefers to remain on the ground where it hunts at night; there is no web and no sign that would let you know where you'll find a specimen since the wolf spider desperately tries to stay out of the humans' way. 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. One identification method used by scientists consists in checking how many pairs of eyes the species has; the brown recluse spider has only three pairs of eyes, unlike most other spiders that have four. Two eyes are located in a median position while the other four are placed on the sides of the body. 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. This unjust pattern is not justified since even the most poisonous spiders will not attack a human unless they felt threatened. All spiders need to inject venom in order to survive, it is in the nature of their species and one of the life mechanisms they have been endowed with; what really differs from one species to another and gives rise to the classification into poisonous and non-poisonous is the amount of venom and its toxicity. Contact a health care provider immediately if you've been bitten by a spider and you experience fever, nausea, swelling of the tissues and severe pain. 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.