Mouse Identification
Signs of mice inside a home.
Resources
Mouse Droppings: What They Look Like and What to Do
Small, dark and rice shaped. Where you find them tells you where to look for the way in.
Short answerMouse droppings are small, dark and about the size of a grain of rice, often found in drawers, cabinets and behind appliances. Wear gloves, avoid raising dust and clean carefully, then look for where the mice are getting in.
Where to Find Them
Along walls, in drawers and cabinets, behind stoves and refrigerators and near food. Lots of droppings in one place suggest a nest is close.
Clean Up Safely
Wear gloves, do not sweep dry droppings into the air and follow Health Department cleaning guidance. Heavy contamination needs professional help. See sanitation.
Then Find the Route
Cleaning removes evidence. It does not stop new mice. See rodent exclusion.
Not sure what you are dealing with? An inspection finds the source and sets the scope.
Questions and Answers
Do I need cleanup after rodents?
Usually yes. Droppings, urine and nesting material contaminate surfaces, and the Health Department notes that rats use urine and droppings to signal to other rats, so leftover residue can keep drawing activity. Wear gloves, do not sweep dry droppings into the air, and follow Health Department cleaning guidance. Heavy contamination or insulation damage may need professional work.
How can I tell a rat from a mouse?
Droppings and size tell most of the story. Mouse droppings are small, about the size of a grain of rice. Rat droppings are noticeably larger and blunter. Adult mice are small with large ears and a slim tail. Rats are much heavier with a blunt nose and a thick tail. The difference changes the treatment, so it is worth getting right.
Last reviewed 2026-09-21. Time sensitive NYC rules and processes change, so check the linked official pages before you act.
Related pages
Rodent Sanitation & Cleanup
Cleaning droppings, nests and contamination.