Why bears hibernate - Big Sky Bears - BBC
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. 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: http://www.youtube.com/bbcearth
登録:2012/01/29 04:09:55
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