the american mink is an absolute w*nker. It is having a massive impact on water voles, and probably everything else. With those... it's shoot to kill. It's still like that in some places with slowworms. Although there isn't sufficient data (although im working on it) i think british herps are in decline. Fortunately they are getting some better press and there are growing numbers of people supporting the conservation of them.
i am on a personal pampaign to kill as many mink as i can, my count is 2 so far, they are a big problem were i live (you may remember seeing on the news about those two thousand mink that the animal rights terroroists let lose) well they all moved into my stretch of the canal