The answer to 'why is my stink bug droppings' is that stink bugs, also known as shield bugs, often leave behind small, dark-colored droppings that can appear on surfaces in your home. These droppings are a byproduct of the stink bugs' feeding habits, as they use their piercing-sucking mouthparts to extract juices from plants and fruits.
Stink bug droppings are typically found in areas where the bugs congregate, such as around windows, doors, and other entry points. The droppings can be unsightly and may even stain surfaces if left untreated. However, the droppings themselves are generally not harmful to humans or pets, although they can be a nuisance.