Wild horse roundup triggers controversy

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Photo: Humane Observer: Elyse Gardner

Editor's note: Don't miss "American Morning" this week for the four-part series, "Mustang Roundup: Taking the wild out of the West."

Silver Springs, Nevada (CNN) -- The helicopter is on the chase. At first, you can only hear it. Then, from behind the hillside, you see a herd of wild horses running for their freedom, with the helicopter close behind.

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