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FILE - In this May 22, 2010 file photo, nesting pelicans are seen landing as oil washes ashore on Cat Island in Barataria Bay, in Plaquemines Parish, La. (AP Photo/Gerald Herbert, file)

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.