Mink are members of the mustelid family; related to species such as badgers, otters, polecats and stoats. In size, they are much smaller than an otter but larger than a stoat and similar in size to a polecat or domestic ferret. They are mostly a very dark brown, appearing almost black and may have a few white patches on their chin, throat, or underside. They may occasionally be other colours, such as a silvery grey. This variation relates to the breeding of mink in various colour forms in fur farms, from which the ancestors of our feral mink escaped or were released.