1. Size
The easiest way to tell rats and mice apart is their appearance. Rats are much larger than mice. The average mouse is around 12-20 cm, while the average rat is twice that size. If you don’t have a ruler handy take a look at their tails. Rats have thick, relatively short and naked tails. Mice, on the other hand, have long, furry and skinny tails.2. Sounds
It’s difficult to distinguish these rodents by sound alone, but not impossible. If you have rodents in your house, you may hear scratching or chewing. Either will scurry through your walls at night when the house is quiet. The big difference between them is how they talk to their own kind. Mice squeak, while rats communicate using sounds inaudible to humans. If you hear squeaking, you can be fairly sure you’ve got mice on your hands.3. Diet
These pests aren't picky eaters, but they do have preferences. Mice are health enthusiasts and typically go for veggies, fruits, grains and nuts. Cartoons don’t have it all wrong though. Mice will still eat cheese if that’s what they’re able to find. Rats prefer to eat proteins like meat, fish, and yes: cheese. Maybe cartoons weren’t that far off after all!