These animals are not insects, but arthropods. They have two body regions, cephalothorax, and abdomen connected by tiny waits. They have no antennae, 4 sets of legs and 8 simple eyes, sometimes 6. Below the eyes are two jaws which end in a hollow fang that is connected internally to a poison duct. The males are usually smaller than females and may differ in coloration. The immature stages are egg and spiderlings, the latter closely resemble the adults except for size and coloration in most cases. Many spiders are associated with moisture and, therefore, are found in basements, crawl spaces, and other damp parts of buildings. Others will live in warm, dry places so are found in subfloor air-vents, in upper corners of rooms or in attics. All spiders in the Northwest prey on insects or whatever they can capture.