Birds fly over containment booms placed to try to stop oil from reaching the shoreline along the South Pass, south of Venice, La. Oil from a massive rig explosion threatens the region's wildlife. Eric Gay/AP hide caption

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Containment booms designed to be a protective barrier circle Dauphin Island at the mouth of Mobile Bay in Alabama. Debbie Elliott/NPR hide caption

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This satellite image taken Thursday shows the oil slick in the Gulf of Mexico as it nears the shoreline, threatening wildlife along Louisiana's fragile islands and barrier marshes. NASA/AP hide caption

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