Mrs. Brisby, a shy and timid field mouse, lives in a cinder block with her children in a field on the Fitzgibbons' farm.
Squeak - An upper class fieldmouse who initially comes to London seeking his inheritance, but who decides to stay at Oxford Circus.
Dobrava virus and the variants of Dobrava-Belgrade virus have been found in the Yellow-necked mouse (Apodemus flavicollis), the Striped field mouse (Apodemus agrarius) and Black Sea field mouse (Apodemus ponticus).