A Gnawing Mammal Of An Order That Includes Rats - Mice - Squirrels - Hamsters - Porcupines - And Their Relatives - Distinguished By Strong Constantly Growing Incisors And No Canine Teeth. They Constitute The Largest Order Of Mammals.

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1. A Gnawing Mammal Of An Order That Includes Rats - Mice - Squirrels - Hamsters - Porcupines - And Their Relatives - Distinguished By Strong Constantly Growing Incisors And No Canine Teeth. They Constitute The Largest Order Of Mammals.