FILE - In this April 4, 1989 file photo, a sea otter swims in Valdez harbor in Prince William Sound, Alaska. Oil spilled from the Exxon Valdez extends farther into Alaska tidal waters than previously thought and likely is causing long-term harm to wildlife, according to a paper published Tuesday May 16, 2006. The study by National Marine Fisheries Service researchers conclude that oil remains in lower intertidal areas where predators such as sea otters and ducks may encounter it while disturbing sediment in search of prey. Nearly 25 years after the Exxon Valdez oil spill off the coast of Alaska, some damage heals, some effects linger in Prince William Sound. (AP Photo/Jack Smith, File)
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