The large Japanese field mouse (Apodemus speciosus) is a nocturnal species of rodent in the family Muridae.

[6] Large Japanese field mice have been observed changing their typical foraging behavior in response to varying light conditions.

In response to higher light intensity, A. speciosus significantly decreases time outside of the nest, length of excursions, and food eaten compared to periods of dark.

[7] Large Japanese field mice display specific physiological and behavioral adaptations to deal with this toxicity.

A. speciosus is able to acclimate to nuts with high tannin levels by secretion of specialized proteins and recruitment of bacteria to aid in digestion.