A rat is bigger than a mouse. And its tail is longer than a mouse's tail.

Hello Eric!

          Simple explanation but it is correct. ^^

A mouse is small and has skinny tail and a rat is bigger and has a thicker tail. Rats are also considered to be harmful. So be careful, Eric and don't kill them. They might also cause damage to your things. They are also known as smart animals but they are disease carrier.

Take care always and have a happy weekend! ^^

~Teacher Cassie