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Spiders scare the wits out of people. Just by seeing them, thought of what they can do to you come into your mind. Fact is not all spiders are venomous and dangerous. The problem is it is almost impossible for a regular human being to identify the dangerous ones from those that are not. There are over 40,000 species out there, which makes identifying the most dangerous spiders almost impossible. The effect of a spiders’ venom ranges from light to lethal. It all depends on your immune system. Check out the list of the 7 most dangerous species of spiders.