large Japanese field mouse
Refers to the species Apodemus speciosus, a common wild rodent in Japan. Often written in katakana as アカネズミ in biological contexts.
The large Japanese field mouse is widely distributed in Japanese forests.
At night, I heard the sound of a large Japanese field mouse moving under the fallen leaves.
Katakana spelling is common for this species name; usually written in kana.
Kanji spelling is rare; the word is usually written in kana.
Compound of 赤 (aka, 'red') and 鼠 (nezumi, 'mouse'), referring to the reddish-brown fur of this species.