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FILE - In this August, 2009, file photo provided by the Department of Defense, a Cook Inlet beluga whale calf, left, and an adult breach near Anchorage, Alaska. A new study concludes that endangered beluga whales in Cook Inlet changed their diet over five decades from saltwater prey to fish and crustaceans influenced by freshwater. The analysis of isotopes in beluga bone and teeth by University of Alaska Fairbanks researchers showed belugas formerly fed on prey that had little contact with freshwater. (Christopher Garner/Department of Defense via AP, File)

FILE - In this August, 2009, file photo provided by the Department of Defense, a Cook Inlet beluga whale calf, left, and an adult breach near Anchorage, Alaska. A new study concludes that endangered beluga whales in Cook Inlet changed their diet over five decades from saltwater prey to fish and crustaceans influenced by freshwater. The analysis of isotopes in beluga bone and teeth by University of Alaska Fairbanks researchers showed belugas formerly fed on prey that had little contact with freshwater. (Christopher Garner/Department of Defense via AP, File)

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