There are over 35,000 known spider species worldwide, but only a handful are considered to be dangerous and 27 species are known to cause human fatalities.Spiders are attracted to warm, dark small spaces, like wall cracks, corners, air vents and in the washroom. However, some species prefer to stay closer to the outdoors, weaving their webs in your garden or near your outside lighting. Although most common spiders at home are not really harmful, they can be a nuisance because of their webbing and can induce fear to some people