Mouse feces are found in areas where mice are most active, near feeding, breeding, and nesting areas. Droppings are black, cylindrical in shape, and between three to six millimeters (about 1/4 inch) in length. Mouse droppings resemble small grains of rice and are commonly mistaken for cockroach droppings. Always wear protective gloves when disposing of mouse droppings; in heavily infested areas, also wear a respirator. Don’t sweep or vacuum the droppings—disturbing them could release bacteria and virus particles. Droppings should be carefully picked up and disposed of in sealed plastic bags.