Spiders My essay is on spiders. I have chosen a few spiders to report about. I also have some basic info about spiders in general. Spiders comprise a large, widespread group of carnivorous arthropods. They have eight legs, can produce silk, and usually have poison glands associated with fangs. More than 30,000 species of spiders are found on every continent except Antarctica in almost every kind of terrestrial habitat and a few aquatic ones as well. Spiders range in body size from about 0.5 mm (0.02 in) to 9 cm (3.5 in). The term spider is derived from the Old English spinnan ( "to spin" ) referring to the g