Between 30,000 and 40,000 farm-raised minks were released into the wild near Eden Valley, Minnesota, earlier this week when burglars—presumably animal rights activists—cut the fence to a mink-pelt farm and opened the cages holding the mammals, letting them run into the wild. Minks are strange little creatures somewhere between otters and ferrets, and when they run, their front halves and back halves teeter independently like two people pretending to be one horse. While the idea of tens of thousands of minks flopping through a pasture is quite amusing, the minks’ liberation likely came at a price: Farm-raised minks aren’t really...