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Associated Press
Brown pelicans are seen flying over dead mangrove on Cat Island, formerly dense, green and a nesting sight for the pelicans, egrets and roaseate spoon bill, which was directly impacted by oil from the nation's worst offshore oil spill, as it 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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