Driving just outside of the village of Strontian, an otter crossed the road in front of our car today. Like the encounter with the puffin on Staffa, this too was a fleeting experience.
Here's an old silent BFI film from 1912 of the first known filmed recordings of an otter swimming underwater including a brief glimpse of the cameramen setting up their tank/equipment. The subtitles between shots are infuriatingly long and protracted and some of the "facts" are a bit dubious (otters belonging to the "bear tribe"...?), but the footage itself is lovely.