The field mouse is also known as the house mouse. Mammalia, Rodents, Murines. Timid, cunning and about 7 cm in length, the tail is as long as the body. There is a notch on the back of the upper incisors, and the crown of the first upper molar is larger than the sum of the crowns of the second and third upper molars. The coat color varies greatly, generally the back hair is gray-brown to dark brown, and the abdomen is gray-yellow or gray-white.

Inhabits houses, warehouses, fields and mountains. The tunnel is short, the diet is mixed, the staple food and grass seeds. Day and night activities not only bite furniture and clothing in residences, warehouses, etc., steal food and grain, endanger crops, but also infect various diseases. The field mouse is one of the main pests. The fecundity is strong, and it can reproduce almost all year round, with an annual output of 3 to 8 times, and each litter of 4 to 8 young. Distributed all over China.