The most startling sign is when they invade in staggering numbers. They usually appear on sunny sides of buildings in the fall. They migrate into buildings and homes to find shelter for the winter through small cracks and crevices. They’re found in doors where heat sources within the building are high and can be located in the warmest areas of a structure’s walls. While they do not cause damage to buildings, their droppings are unsightly and leave stains on furniture and linens. The presence is a nuisance and can cause distortion of trees, flowers and other foliage.

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