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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I've heard that the black and white stripes on a zebra provide camouflage. How can this be if they're not in a black-and-white environment?
Giraffe, the tallest living animal. It is a ruminant (cud-chewing mammal). It lives in dry savannas of Africa, south of the Sahara.