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Associated Press
A brown pelican sits on dead mangrove, which was directly impacted by oil from the nation's worst offshore oil spill, is seen as Cat Island, formerly a vibrant nesting ground for pelicans, egrets and roseate spoon bill, as erodes into Barataria Bay in Plaquemines Parish, La., Thursday, April 18, 2013. Underneath the surface, environmentalists and scientists fear there may be trouble, from tiny organisms to dolphins. Yet the long-term environmental impact from the spill is still not fully known and will likely be debated for years to come. (AP Photo/Gerald Herbert)

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