How do the body of animals change after hibernation?

After hibernation, animals often experience changes such as increased fat reserves, alterations in muscle mass, and adjustments in metabolic rates. Their bodies may also undergo hormonal changes that help regulate energy balance and stimulate awakening. Additionally, hydration levels can fluctuate, necessitating rehydration as they emerge from hibernation. Overall, these adaptations help ensure their survival and readiness for the active seasons ahead.