What common pest is likely to leave droppings resembling black pepper?

The correct answer is cockroaches, as they are known for leaving droppings that resemble black pepper. Cockroach droppings are small, dark, and pellet-shaped, making them easy to identify. The presence of these droppings is often an indication of an infestation, and it is crucial for food safety inspections to recognize such signs, as cockroaches can carry diseases and contaminate food.

Ants, houseflies, and fruit flies do not leave droppings that resemble black pepper. Ant droppings are typically more identifiable as tiny grains or sandy particles, while houseflies produce a more liquid waste that won't match the pepper-like appearance. Fruit flies do not leave noticeable droppings at all but are more often recognized by the presence of their bodies and the fruit itself they infest. Understanding the droppings of pests is vital for proper pest management and maintaining hygiene in food service environments.