It was a surprise to pick up this stoat on the trail cam. This makes the fourth mustelid I've seen in the field (if you count finding otter spraint as a 'sighting'). I've also seen weasels and a polecat here. All these predators will eat water voles, but because they're native and in the balance, vole numbers stay buoyant. The worry is if mink invade, because they are non-native carnivores and can wipe out whole colonies of water voles in a matter of weeks.