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.
In the natural order of things there are predators and there are prey, with an interchange of roles down the food chain. In one of these struggles for survival is african buffalo try to defend themselves from lions. Take this quiz and learn more about the buffalo's defenses.
Who would have thought that dolphins might be an important part of a war effort? Dolphins have natural abilities that allow them to detect underwater mines, potentially saving many lives and millions of dollars of marine equipment. Take this quiz to learn more about the dolphin's role in disarming mines.