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Here you go.These things are everywhere. They especially like to live underneath waterfront homes (I hear they poop a lot, and the mess is very smelly, but I don't have first hand experience with that).
Yea, those are not sea otter either. River otter spend a lot of time in the salt. I doubt you are going to be seeing sea otter in the Sound until you get up towards the San Juans and along the coast close to the shore.