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Alaskan or Northern Sea Otter (Enhydra lutris) with Common Goldeneye drake (Bucephala clangula).  Alaska.  This goldeneye worked this sheltered cove where 10-30 sea otters came to raft during mid-day, feeding on their poop.  Being that the sea otter feed extensively on molusks, crabs and other marine life I'm sure this was a rich diet for this duck.