Does 2 mice mean an infestation?

Finding two mice does not automatically mean you have a large infestation, but it is a strong warning sign that you likely have more than two and that conditions in your home are suitable for mice to live and breed. Mice are social animals that live in family groups, and a single female can produce five to ten litters per year with five to six pups each, with pups maturing in about six weeks, so two mice can quickly become many. If you see two mice at different times or in different areas, or if you see one mouse during the day, which is unusual because mice are nocturnal, it often indicates overcrowding in hidden nests. The definition of infestation is generally more than a stray mouse that wandered in, evidenced by multiple signs such as numerous droppings scattered around, gnaw marks on food packaging, scratching noises in walls at night, musty urine odor, and nesting material. If you have caught two mice within a few days, you should assume there are more hidden in walls, attics, or under appliances. It is best to treat two mice as the start of an infestation and act quickly by setting many traps, sealing holes, and cleaning thoroughly rather than waiting to see if more appear, because early intervention prevents a small problem from becoming a large one.