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Under the influence of environmental factors, in winter-sleeping animals living in extreme winter conditions, a wide range of mechanisms of ecological and physiological adaptations is mani-fested that ensure the normal course of wintering and the survival of populations of species after its end. We carried out an analysis of our own data and literary sources on ecology and endoparasite infestation in three species of rodents – black-capped marmot, Asian long-tailed ground squirrel, Siberian (Asian) chipmunk, and in a representative of predators– brown bear. Data on the distribu-tion of the listed species of hibernating animals in the territory of Yakutia, their reproduction, nutri-tion, the extent of infestation by helminths, hibernation, time of bedding and awakening are given. Before going into hibernation, all hibernating animals reduce their diet and resort to hunger strikes. During this period, liquid and solid excrement is excreted from the body and, together with food waste, helminths leave or destrobilatethe gastrointestinal tract.