Weasel.

[piscatus absentis]

I was sitting having a break this morning and felt I was being watched but could see no one or anything.  Then a weasel ambled past me into a piece of rough ground at the side of the loch.  After a wee bit of grass waving it came out carrying a mouse or shrew, looked at me as though to say, "that's how you do it", and walked away.  Half an hour later and further up the loch I came across it again (I assume it was the same one) and it just looked at me and carried on as normal (for a weasel).

Some animals seem to know that fishermen are not a threat.