Hibernation is a state of prolonged dormancy and reduced metabolic activity in animals that helps them conserve energy during periods of environmental stress, such as cold weather or food scarcity. Animals that hibernate enter a deep sleep-like state where their heart rate, breathing, and body temperature decrease significantly. This allows them to survive for extended periods without eating or drinking. Hibernation is a survival mechanism that enables animals to withstand harsh conditions and is commonly observed in mammals like bears, bats, and ground squirrels. It helps them conserve energy and avoid the need to forage during unfavorable conditions.