Signs of a Mouse Infestation

If you think you might have a problem with mice in your building, checking for the signs of infestation will help you find out. Mice can be hard to spot, but the signs are often there if you look carefully.

What to Look For

Mice are skittish creatures and are unlikely to come out when you are likely to see them. Because they breed so quickly, a mouse infestation can become very large before you even know there's a problem. If you notice any of these signs, contact a pest control professional as you may have an infestation.


Mice can leave around 50 to 80 droppings a night, and the more droppings you find, the larger the population you have. Fresh droppings are small and dark and will be scattered randomly; check inside or on cupboard tops and along skirting.

If you notice droppings that are gathered all in one place rather than scattered randomly, you may have a rat infestation.


Rodent tracks - footprints and tail drag marks - can show up in dusty environments, such as unused lofts, storage areas, and garages. If you suspect mice, you could sprinkle a fine dust such as flour, talcum powder or china clay over the area and check back to see if any marks appear.


Mice urinate frequently and their wee has a strong ammonia-like smell. The stronger the smell, the closer you are to mouse activity. This smell can linger for a long time (even after an infestation has been removed).


In established or heavy infestations, body grease combined with dirt and urine builds up into small mounds, which can be up to 4cm high and 1cm wide. If you see these little mounds, contact a professional immediately as the infestation may be getting out of control. These mounds are most common in unused areas like closed offices or storage areas.

Bite marks

Some people notice a mouse infestation following the discovery of chewed food packages and sometimes even tiny bite marks on fruit. Check cupboards and food storage areas for evidence of mice chewing through food.


Mice line their nests using soft, easy to shred materials. Check for evidence of nests or materials being used to create nests.

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