One easy way to tell if you have mice or rats in your house is to look at the poop or droppings. Mouse poop is smaller than rat poop.
Now you can call the exterminator.
But don’t take our word for it. The Centers for Disease Control has a nice picture guide to rodent poop that you can download and use as you look at droppings around your house.
The CDC graph shows that usually about 11 mouse droppings fall in a cluster within a square-inch area. Rat poop, however, only has about 5 or 6 in the same space.
Must be fun studying animals poop for a living. Rat poop is spaced further apart probably cause they run faster.