Hibernating is a survival strategy used by some animals, such as bears and ground squirrels, to conserve energy during cold months when food is scarce. During hibernation, these animals enter a state of deep sleep, significantly lowering their body temperature, heart rate, and metabolic rate. This allows them to survive on stored body fat until warmer weather returns. While hibernating, animals may wake up occasionally to drink water or check their surroundings, but they remain mostly inactive. This process helps them avoid harsh winter conditions and reduces the need for food, making it an essential adaptation for survival in certain environments.