There is a whole range of symptoms, one nastier than the other that accompany the bite of a dangerous spider: digestive troubles such as nausea and vomiting, headaches and fever, not to mention the local discomfort manifested as pain and itchiness. The bite of the same poisonous spiders may trigger different reactions in separate individuals, since personal sensitivity to the toxins in the venom matters a lot. 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. Because of its high adaptability to the environment, it will cling very easily thanks to its articulate legs. Thus, if you get a huntsman spider on your clothes, you'll find it pretty difficult to shake it off. Far from being seen as a threat to humans, the huntsman spider is pretty useful since it mainly feeds on insects. For such cases spider identification is not necessary; but we cannot say the same thing about the widow spiders that require the immediate use of an anti-venom. Therefore, spider identification can be crucial when you need to be able to apply the right treatment without any further delay. Spiders that live outdoors are more difficult to identify due to the large number of species both harmful and venomous. Wearing some rubber gloves when cleaning up around the house will help you avoid being exposed to a direct contact with the brown widow spider. The hourglass mark specific to all widow spiders colored in yellow or orange remains a distinguishable characteristic on the bottom of the abdomen. The bite of the brown widow spider is pretty painful, causing a lot of trouble to the victim, yet, it is not even by far as serious or as toxic as that of the black widow. Some varieties have golden hairs on their carapace that makes them look dusty and allows for a perfect camouflage. Trapdoor spiders may also have parallel bars on the abdomen, but this is not always the case, since diversity is at home even within the range of the same species. Trapdoor spiders are not that easy to identify since there are other similar species for which they are often mistaken: the funnel-web spiders and the mouse spiders are the most relevant examples here.