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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Squirrel is a small is active, bushy-tailed mammal. The name comes from the Greek for "shade-tailed." Squirrels are gnawing mammals, or rodents.