February 7, 2009 9:12 AM

Exxon Valdez oil spill still taking toll on killer whales

Twenty years after the massive spill, as much as 16,000 gallons of oil linger in Prince William Sound. Arguments linger over whether Exxon should pay more for cleanup work. And federal scientists and other researchers at an environmental conference in Anchorage this week say they're still learning what the massive spill meant for local wildlife.

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