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Avocets in Louisiana's Delta National Wildlife Refuge. Credit: Donna A. Dewhurst/U.S. Fish and Wildlife Service

From Treehugger: Officials have reported that an estimated 18,000 gallons of crude oil have spilled into a Louisiana wildlife refuge 60 miles outside of New Orleans. The rupture occurred in a Chevron oil pipeline, and an evaluation of the damage to the ecosystem is underway. What's known is that the spill has created a 5 mile long slick, and occurred in a remote area so difficult to access that caretakers weren't able to reach it.