The term for an animal that hibernates during winter is "hibernator." Hibernation is a survival strategy employed by various animals, including mammals like bears, ground squirrels, and bats, as well as some reptiles and amphibians. During this period, these animals enter a state of reduced metabolic activity, allowing them to conserve energy when food is scarce and environmental conditions are harsh. Their body temperature, heart rate, and respiration decrease significantly. This adaptation helps them survive long winters, and they typically emerge from hibernation in the spring when temperatures rise and food sources become more abundant.