Caribou, elk, and oxen often migrate away from areas where it gets too cold or snowy because the cold and snow kill their food source: herbs and grass. Because they’re on the move, they do not hibernate. Wolves also don’t hibernate because they actively hunt food all winter (arctic wolves will actually chase the caribou and oxen during their migration). Ground squirrels, mice, and other rodents hibernate, and so do bears, as well as badgers and skunks. There is a species of frog that will freeze itself (slow its heart down enough that it goes into a kind of cryogenic-freezing process) until its habitat thaws out.
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