This mink was having a field day (or perhaps that's a "rock day"), fishing from the shoreline, going under a "stonehenge" and rubbing itself against the rocks.
I believe it was trying to dislodge some "fishy" parts from its mouth (hence the teeth baring), as well as cleaning and distributing the oil through its fur for water protection.
From its stance on those small rocks, you can be a king over your domain!
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