The American beaver's ability to nibble wood demonstrates the stunning adaptability of these amazing mammals. In addition to creating their own lake, this family of beavers construct a make-shift fridge and winter-time snug. From the BBC's Life of Mammals documentary series. Watch more high quality videos on the BBC Earth YouTube channel here: http://www.youtube.com/BBCEarth and visit http://www.BBCEarth.com for all the latest natural history exclusives and fantastic new wildlife videos.