This September 2008 photo provided by the Center for Whale Research taken near Washington state's San Juan Islands shows scientists looking for clues about the diet of the Pacific Northwest's endangered orcas using a pool skimmer to collect the scales or other remains of salmon the whales had eaten. A long-term study published Wednesday reaffirmed the importance of Chinook salmon to the whales even when they cruise the outer Pacific Coast, where the fish are harder to find. (Ken Balcomb/Center for Whale Research via AP)
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