鼠 - rat, mouse, dark gray

mouse; rat

eastern chipmunk (Tamias striatus)

rat-bite fever; sodoku

ground squirrel (esp. a ground squirrel of North America or Africa)

ground squirrel (esp. the Daurian ground squirrel, Spermophilus dauricus)

inguinal gland

Korean chipmunk (Tamias sibiricus barberi)

mole

Of Mice and Men (1937 novella by John Steinbeck)

Japanese giant flying squirrel (Petaurista leucogenys)

Japanese grass vole (Microtus montebelli)

geometric progression