<human>:  What is the difference between a mouse and a rat?
<bot>: The main difference between a mouse and a rat is size, with mice typically being much smaller than rats. Mice are usually between two and four inches in length while rats can usually be anywhere from five to seven inches in length. Mice also typically have a lighter coloration and a pointed snout, while rats can have a darker coloration and a rounder snout. Mice are also much easier to tame, and are popular as pets, while rats are not as commonly kept as pets due to their higher levels of aggression.