Question: what is the size difference between a mouse and a rat?
Answer: Adult mice measure around 7 ½ inches in length, including the tail; while adult rats can grow up to 18 inches in length, including the tail. Mice have thin, slightly hairy tails; rats have a thicker, hairless, scaly tail. The nose of a mouse is triangular in shape; the nose of a rat is more blunt and rounded.