How to describe the appearance characteristics of mice?

When it comes to mice, people first think of "mice" with small eyes, sharp mouth and thin tail. In fact, "mouse" does not refer to an animal, but refers to a class of animals. Rats are only part of the rodent family. The distinction between mice can be divided into broad sense and narrow sense. Rats in a broad sense refer to rodents, with 35 1 genus 1735 species in 33 families, accounting for almost 50% of mammals. Professor Li Chuankui, one of the pioneers of the dynamics of ancient mammals in China, pointed out on the basis of a large number of fossil evidences that the oriental rat is the closest known ancestor to rodents. Due to the two great divisions in the new third century and the beginning of the fourth century, the species, forms and living habits of mice are diversified. There are terrestrial, arboreal, semi-aquatic and so on. Their specialties are jumping, running, climbing, sliding, swimming and digging. Nevertheless, their basic characteristics are the same: no canine teeth, a pair of sharp incisors with clear outline, lifelong growth, continuous grinding and its unique chewing function. In a narrow sense, only Carnivora and Muridae have 100 genera. What we usually call "house mouse" is the genus house mouse and the genus house mouse in the family Muridae. Their common characteristics are: small size, gray fur, sharp kiss, small eyes and bare scaly tail. The common species in China are Rattus norvegicus, Rattus norvegicus, Rattus flavipectus and Mus musculus.