Spiders boast eight legs and are a diverse group of arthropods found everywhere in the world except Antarctica. While most everyday house spiders are harmless, window spiders and brown recluse spiders have become household names for their venomous bites. While some spiders may be very tiny, others such as the tarantula or cellar spider ( aka "granddaddy long-leg) can be quite large.
Spiders differ from insects in a few important points such as having 4 pairs of legs instead of 3 pairs of legs. They also only have two body regions rather than three making them easy to differentiate. Most spiders also have eight simple eyes located at the front the cephalothorax, however, some have fewer.
Spiders are some of the most pervasive pests but generally are easy to manage. However, if you have a brown recluse infestation, you need to call a professional to thoroughly inspect your home and help you eliminate it immediately.