Rodents are an order of the Mammalia class, with only one pair of incisors in the upper and lower jaws, and they like to bite hard objects. Rodents are generally small, and most are active at night or in the morning and dusk. Many species have strong reproductive capabilities. The number of rodent species accounts for about 40% to 50% of mammals. It can be said to be the most successful branch in the evolution of vertebrates. The number of individuals far exceeds the sum of all other groups. It