Cockroach droppings vary slightly depending on the species involved, but there are a few consistent features worth knowing. Smaller cockroaches, like German cockroaches commonly found in kitchens, tend to leave droppings that resemble ground coffee or coarse black pepper, often scattered rather than clustered in one obvious pile.
Larger species, such as American cockroaches, produce more cylindrical droppings, sometimes with slightly ridged sides, closer in shape to a grain of rice than a speck of pepper. Both types are typically dark brown to black, dry to the touch once aged, and tend to accumulate in areas the household rarely disturbs.