Beaver
Live in mostly underwater huts called dams, which are made of branches, sticks, and mud in rivers, marshes, streams, lakes, and ponds. Beavers eat mostly tree bark, although they occasionally also eat roots and other forms of vegetation. They can live to be up to 20 years old1.
For more information about beavers and wild animals in general, click here to go to the Q&A page.
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References:
1) (2009). Beaver- castor canadensis. Retrieved April 5, 2009, from NatureWorks Web site: http://www.nhptv.org/Natureworks/beaver.htm
2) Image is ClipArt from Microsoft Word