I saw a very small mink successfully hunting while I was kayaking/wading the Kish last November. It pulled a rather large salamander out of a rock pile and had a happy spring in his step as he bounded off with it.
As for otters, we came across a family of them in Canada at a fly in cabin when we all brought cheezy inflatable rafts so we could fish below a rarely used portage. The walleye fishing was nonstop, every single cast until they showed up. Then it literally shut down for a few minutes while they moved through. The parents were very vocal about us being in what had to be one of their favorite mealtime spots. It was one of my all-time favorite outdoor moments and made the trip worthwhile just for that interaction alone.
