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Why Do Bears Hibernate? | Big Sky Bears | BBC Earth

Why do bears hibernate? Watch this to discover how much effort is spent on survival during winter in the world of the Big Sky Bears. Subscribe to BBC Earth: http://bit.ly/BBCEarthSub Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here:    / bbcearth   Watch more videos from BBC Earth: Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth http://bit.ly/PlanetEarthPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur http://bit.ly/PlanetDinoPlaylist Check out the other two channels in our BBC Earth network: BBC Earth Unplugged: http://bit.ly/BBCEarthUnplugged BBC Earth Lab: http://bit.ly/BBCEarthLabYouTubeChannel About BBC Earth: The world is an amazing place full of stories, beauty and natural wonder. Explore the official BBC Earth YouTube channel and meet the animals and wildlife of your planet. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history documentaries. Dramatic, rare and wild nature doesn't get more exciting than this. Subscribe to be the first to view new animal documentary videos. And you can become part of the BBC community by checking out our BBC Earth Facebook page. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community. This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/co...