When you are able to identify spider species correctly, the risk of getting bitten out of personal negligence is a lot lower; moreover, in case you do get bitten, you can provide valuable information about the species, thus making treatment a lot easier. Many patients are yearly treated for the wrong affection because of the misidentification and misdiagnoses of spider bites. They are found almost everywhere on the North American continent except the area at the west of the Rocky Mountains; what seems even more interesting is the fact that a variety of brown recluse spiders is also found in Hawaii. In its natural habitat the species prefers rotten tree bark as the favorite place to make the nest, but it is also found in alls sorts of house corners. Warmth and humidity make the perfect habitat for the funnel web spider, nevertheless, they also suffer from heavy rains that destroy their burrows. In the aftermath of such events, the funnel web spider redoubles its level of activity so as to get its life back on track. The size of the species varies from 1.5 to 4.5 centimeters for the body length; they are mono-color, dark brown usually, without any patterns at all. Hives, wheezing, shortness of breath and weakness are the general symptoms associated with anaphylaxis, therefore call 911 right away if you notice any such symptoms. Other systemic reactions to spider bites include leg cramps, leg numbness, headaches, pulse changes, exhaustion and more, they are all serious enough to determine one to call the doctor right away. Nevertheless, extreme attitudes towards poisonous spiders give rise to phobias and the urge to destroy their nests even in the wild. Keep in mind the fact that these creatures will not attack unless they feel threatened, as a human is no prey for their match. The harm the spider venom can inflict depends on the fierceness with which the spider will defend itself. Sometimes, even vision problems have been reported, but under such circumstances you should contact the doctor right away and receive professional help. Nevertheless, it is a good idea to stay calm since anxiety adds up to the severity of the symptoms and that is surely the last thing you'd like to do.