ビーバー

A brown beaver with buckteeth and a wide paddle-like tail. Can be used in the context of actual beavers, or metaphorically to evoke qualities of beavers like working hard, as in the expression beavering away. 

Commonly associated with Canada, as beavers are a national emblem of the country. May also be used in reference to the vagina, which is an informal sense of the word beaver.