Aside from size, rats have smaller ears and produce fewer droppings (20 to 50) compared to mice (40 to 100). Let’s take a closer look at the differences in appearance between rats vs. mice ...

House mice have larger ears than rats. David A. Northcott / Getty Images. A house mouse is two to four inches in length with large ears and white, brown, or grey fur.

Appearance: Differences in size, ears, snouts, and tails. At first glance, rats and mice may appear similar, but several key differences set them apart.