I walked up on a pair of otters hunting fish last summer. I got right to the bank before one of them noticed me. They look so quizzical, and seemed so unconcerned, that when the one dove, I thought it was coming closer to get a better look, but apparently it was headed back to the den, because I never saw it again. The other one then popped up and looked all over trying to find the first one. Eventually, it noticed me standing there, and also returned to the den.
They were slaughtering some fish, but the only fish there were tiny, so they were sucking them down like sardines. Very effective hunters, I'd have to say, which was good, cause it would take dozens of fish that size to fill an otter belly.

