Actually, bears use more energy than one would assume, as they need to keep themselves warm during hibernation. A typical bear will consumer 4000 kcals per day while hibernating, mostly in the metabolizing of body fat, though it will not eat, drink, urinate, or defecate. A hibernating bear can also reduce its metabolic rate and oxygen consumption by half, reduce blood flow to skeletal muscle by 45%, slow its heartbeat to 8-21 beats per minute, and reduce its breathing to one breath every 45 seconds.
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