A subgroup of air-breathing, terrestrial (land) arthropods, spiders are not actually insects but rather belong to the Class Arachnida (a.k.a. arachnid). Besides spiders, other arachnids include ...

What Are Brown Widow Spiders? It seems everyone has heard of the black widow spider. But there is a little-known cousin that's becoming a pest in certain parts of the United States — the brown widow ...