House mouse (Mus musculus) - House mouse (English spelling)

Japanese: ハツカネズミ(二十日鼠) - ハツカネズミ（英語表記）mouse

Also known as mice, they belong to the rodent family, Muridae (illustration). They are thought to have originated from the Mediterranean region through central Asia and China, but are now found everywhere humans inhabit, from the tropics to the polar regions. Body length is 6.5-9.5 cm, tail length is 6-10.5 cm, and weight is 12-30 g. The dorsal surface of the body is gray-brown, and the ventral surface is pure white in wild or semi-wild subspecies, while in domesticated ones it is slightly lighter in color than the dorsal surface. They live in human dwellings and the surrounding fields, moors, and forests, and are active during the day and night in 45-90 minute cycles.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

マウスとも呼ばれ，齧歯（げつし）目ネズミ科に属する（イラスト）。原産地は地中海地方からアジア中部，中国に至る地域と考えられているが，現在では熱帯から極地まで人間の住むところのすべてに分布。体長6.5～9.5cm，尾長6～10.5cm，体重12～30g。体背面は灰褐色で，腹面は野生または半野生の亜種では純白色，住家生のものでは背面よりわずかに淡色。人家やその周辺の田畑，原野，森林にすみ，夜も昼も45～90分を周期に活動する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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