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This animal… can stop eating for months… and still survive. No food. No hunting. Nothing. It’s the brown bear. And before winter… it does something extreme. It eats. Constantly. Up to 20,000 calories a day. Building a massive layer of body fat. Because when winter hits… everything changes. The brown bear enters hibernation. Its heart rate slows. Its body temperature drops. And it lives entirely off stored fat. No food. No water. For months. Its body recycles waste… preserv