![]() Despite their formidable appearance, orb weaver spiders are not considered dangerous. This spider is about 1 inch long and hangs head down in the center of the web, which is found in brambles, bushes, tall grasses, etc. One common spider, known as the yellow garden spider ( Argiope aurantia), has silver hairs on the back of the cephalothorax and a large abdomen marked in black and bright yellow or orange. Some have oddly shaped abdomens (pointed spurs, conical tubercles, etc.). ![]() Many species of orb weaver spiders are large (approximately 1 inch), but others are quite small (approximately 0.1 inch). These spiders have poor vision and locate their prey by feeling the vibration and tension of the threads in their web. Each species of orb weaver typically constructs a web with a distinctive design. Orb weaver spiders construct the familiar circular, flat, elaborate web in which flying insects are trapped. This species frequently abandons webs that do not yield prey, and then constructs new ones until it finds a productive site. The common house spider requires high humidity and plentiful prey it typically occurs in damp basements, cellars, crawl spaces, and outbuildings. One member of this family, the common house spider ( Achaearanea tepidariorum) is about 1/3 inch long (female), gray to brown, and its spherical abdomen has several dark stripes near the tip. Cobweb spiders, including widow spiders, belong to the family Theridiidae and have a rounded globular abdomen (black widow spider shape). Some species construct a retreat within the web and hide therein during the day, and the spider hangs upside down in the center of the web at night. These spiders often are inconspicuous, although their web is not. The outer sticky threads of the web entangle insect prey. These spiders typically construct an irregular web in sheltered sites indoors or outdoors. In cases involving considerable numbers of spiders or when control efforts are needed in crawl spaces, a professional company such as Terminix should be consulted.The web building habits of cobweb spiders contribute to their pest status.
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