light shower

二十日鼠: a house mouse

Alternative spelling of 二十日鼠 (“house mouse”)

Mus musculus, the common house mouse

mousehole, rathole

Synonym of レミング (“lemming”) (rodent)

Synonym of 赤鼠 (akanezumi, “large Japanese field mouse”)

砂鼠: Mongolian gerbil (Meriones unguiculatus)

A common word problem in Japan. It says that "In January, there is a pair of mice. They copulate and bear twelve children. The next month, 7 pairs of mice copulate and bear twelve children respectively. How many mice are there in December?"

Alternative spelling of 谷地鼠 (“Japanese red-backed vole”)