Most spiders are nocturnal. During the day they are seldom seen, unless they are sought of distrubed in their natural environments.

Apart from several types of indigenous Australian spiders whose bites are often dangerous and occasionally life-threatening, most are relatively harmless. However, they sometimes bite humans that encroach on their habitat. Any spider bite should receive medical attention as blood poisoning or an infection could possibly result. Apart from widespread and sometimes pathological fear of spiders, the most common reason for control is the elimination of unsightly webs.

Below is an excellent chart of dangerous spiders.

To see more details about this chart, please visit the following site. Heritage Pest