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Pelicans are seen sitting on dead mangrove stumps that were formerly nesting grounds atop the mangrove on Cat Island in Barataria Bay in Plaquemines Parish, La., Wednesday, April 11, 2012. (AP Photo/Gerald Herbert)

Photographer describes Gulf oil spill timeline

AP photographer Gerald Herbert documented the devastation at Cat Island in Barataria Bay, in Plaquemines Parish, La. a month into the Deepwater Horizon oil spill, and returned two years later to find the area in a worse state of deterioration.