ya thats definitely a mink i dont no why it was a mistery otters arent that small and there tails arnt held up but they drag them around so ya thats a mink also otters dont take food in to rocks like that they just eat what they catch where they catch it. another point is otters mostly only eat fish and it would be unusual to see it dragging that bird or rabbit or what ever that thing was around. Ever unlikely to be a otter definitely a mink