File photo of an oil-covered brown pelican in a pool of oil along Queen Bess Island Pelican Rookery

 
File photo of an oil-covered brown pelican in a pool of oil along Queen Bess Island Pelican Rookery
An oil-covered brown pelican sits in a pool of oil along Queen Bess Island Pelican Rookery, about 4.8 km (3 miles) northeast of Grand Isle, Louisiana, in this file photo taken June 5, 2010. REUTERS/Sean Gardner/Files