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10 animals that are bad for the environment

April 14, 2010, 1:05 p.m.
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Disrupting nature's balance

Animals play an important role in keeping ecosystems balanced, healthy and strong. Just like humans, animals can respond to imbalance with extreme behavior that can be harmful to the environment. Here are 10 animals that can be bad for the Earth when nature's balance gets disrupted. (Text: Bryan Nelson)