AbstractA regular change of fur is of particularly important for small insectivores and rodents, since these animals exist under conditions of constant thermal deficits and spend a lot of time in the forest floor and burrows and constantly make contact with hard substrate. According to studies, the timing and intensity of molting depend on the environmental conditions and the physiological state of the animals. The results show that the characteristics and rate of molting change in individuals of different sex and age groups. This can serve as an indicator of the state of the entire population or a signal of serious impairments of important ecological, physiological, or population processes. The collected data indicate the absence of significant species differences in the timing, intensity, and course of seasonal molting, while the relationship with the sex, age, and state of the population was revealed quite clearly. In studies of the most common species, shrews and rodents in Karelia, we found stability and uniformity in the molting sequence, which does not depend on the animal lifestyle. In most species, molting occurs according to a sublateral (dorsal) scheme, in which the new hair appears first on the lower sides of the sides and head, followed by the belly back, and ending with the top of the head and the back.