What is hibernation in animals and which animals migrate and how?

Hibernation is a state of reduced metabolic activity that some animals enter to survive adverse environmental conditions, particularly during winter when food is scarce. During hibernation, animals experience lower body temperatures, slowed heart rates, and decreased respiration. Common animals that migrate include birds, such as swallows and geese, as well as certain species of fish and mammals like caribou. These animals migrate to find more favorable climates or food sources, often traveling thousands of miles in response to seasonal changes.