Secrets of Marmot Hibernation

A family of marmots prepares for their upcoming hibernation in a den 6 feet underground.

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“The Alps: Winter's Fortress“ premieres January 20, 2021, at 8|7c on PBS.

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A family of marmots prepares for their upcoming hibernation in a den 6 feet underground. As they prepare for their 6-month sleep, marmots dramatically lower their body temperature and survive on their body’s storage of fat and water. They only wake once every 2 weeks to rev up their heartbeat and visit a nearby tunnel used as a toilet.

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