expediently as possible to stop the flow. >> reporter: meanwhile, byproduct is balls of tarp washed up by the residue. they're washing up in the size of pancakes and others have circumference of a nickel. significant amount of oil washing up on a louisiana island used as a bird sanctuary. wildlife workers rescued a state pelican that was coated with oil. but the fear is there will be more endangered animals and they won't receive the same medical attention. there is good news tonight. authorities say they believe most of the oil is largely offshore. and that is where they want to keep it. they are using containment booms and chemicals to try to clean up the oil, but there is still a great deal of uncertainty tonight how much oil is actually out there and when if ever will it all be cleaned up. shannon? >> shannon: david lee miller, thank you. the president said there is