Signs that rodents are present where rice is stored include: feces droppings; runs and tracks (dark, greasy stains) that can be found along the base of walls, fences or across rubble; footprints and tail marks in the dust; urine traces, which are fluorescent in ultraviolet light; chewed grain kernels and gnaw marks on sacks, doors, cables and other materials; and nests in corners or roof areas or