Rattata is a small, quadruped, but unspecialized rodent. Its most notable feature is its large teeth. Like most rodents, their teeth grow continuously throughout their lives, and must be constantly worn down by gnawing. It has long whiskers and a long, slightly curled tail. Rattata has purple fur on its back, and cream-colored fur on its stomach. This coloration (dark on top, light on bottom) is a common protective mechanism for many small animals.