The answer to 'why is my spider droppings' is that spider droppings, also known as spider guano, are a common sign of a spider infestation in your home. Spider droppings are small, dark, and granular, and they often accumulate in corners, window sills, and other areas where spiders live and nest.
Spider droppings can be caused by a variety of spider species, including common household spiders like the house spider, cellar spider, and orb-weaver spider. The presence of spider droppings is a clear indication that you have a spider problem and may need to take action to address it.