Is This A Mink ?

I took myself off to Leatherhead's River Mole this morning to get some practice with the new lens.

I strolled along the river bank and was honestly disgusted at the amount of litter in the river and on the path. Sometimes us humans can be totally careless and damn right ignorant as to the damage this will cause our wildlife - (rant over).

I walked for approximately 2 miles hoping to see a kingfisher or heron but had no luck. I plonked myself down on the grass, to take a breather as the camera equipment was getting heavy, when I saw movement on the other side of the river bank ....... today's blip.

What is it please?

p.s. Apologies I'm a little bit behind with comments. I'll try to catch up!