Quick answer: Rat droppings are a sign of rodent activity, but identification should consider size, shape, quantity, freshness and where they are found. Avoid handling droppings with bare hands.
Where rat droppings may appear
Common areas include along walls, near food storage, behind appliances, in basements, utility rooms and other sheltered travel areas.
Location matters as much as appearance
A cluster near a food source tells a different story than scattered droppings along a wall or utility route. Map where evidence appears before cleaning everything away.
Use care around contaminated areas
Do not sweep or handle suspected rodent waste with bare hands. Follow appropriate public-health guidance for cleanup and use protective measures suitable for the situation.
Droppings should trigger a broader inspection
Look for gnawing, rub marks, nesting material, food access and possible entry points. The goal is to understand the activity pattern, not simply remove visible evidence.