Beavers and their dams play an important role in nature. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species. By constructing dams they create wetlands -- lush environments which attract fish, ducks, frogs and other creatures. However, beavers can become a big headache for farmers and landowners -- a problem we'll examine later in this article.
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Nutria, or Coypu is a large South American rodent. It has been introduced into the United States, where it inhabits marshy areas in Louisiana, Oregon, Washington is and along the Atlantic coast.