Yellow Sac Spiders

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A common house spider, yellow sac spiders invade structures in the fall when the weather turns cool and their outdoor food supply disappears. Indoors, they can be observed on walls and ceilings, but drop to the floor to seek cover when disturbed. Their small, white, paper-like sacs are often found in easily overlooked locations, along ceilings and corners, or behind pictures and shelves. Experts believe sac spiders cause more bites than any other type of spider.