American mink in a Welsh river.
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As I always say on iSpot if yo can identify the animal then is not a poor photo and these are definitely good enough to see this is a mink, especially the first one.
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Lat/Lng: 51.796765702234, -3.6892175674438
OS grid ref: SN836122
Where the Nant Llech meets the River Tawe (Nant Llech SSSI), the woods behind Wales Ape and Monkey Sanctuary, near Henrydd Falls.