Seen sea otters when visiting my grandmother before, both at the aquarium and in the wild around the wharf out there. Always surprises me how big they can get.
Was also at a more local zoo focused on native animal life to the area I live in, and was surprised they had a river otter exhibit, as this state would be one of the last places I'd ever expect them in. Apparently there's a small amount of them living in some hidden river (in that the people running conservation of them don't want them being disturbed by tourists) in the riparian areas. There weren't any actually out for display though. Not sure if it was just a post-lunchtime nap, or if they were off exhibit for some reason.