The American Beaver (Castor canadensis) is a large semi-aquatic rodent native to Canada, much of the United States, parts of northern Mexico, and the most southern province of Argentina, Tierra del Fuego. Common names include North American Beaver, or simply Beaver in North America, as well as its subspecies names, the most common being the Canadian Beaver. The american beaver and the European Beaver are the only two animals in the castor genus. However, the American Beaver has several sub-species.