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Is this a wild otter?
If so, congratulations, they're amazing photos.
It is! There are a couple of very obliging individuals on the river to the south of Thetford. They are very inquisitive and there will be better photos than mine!
Fantastic all the same and wonderful to see them this clearly.
Lat/Lng: 52.409, 0.7547
OS grid ref: TL874825