The anguish and frustration of life in a cage leads minks to self-mutilate—biting at their skin, tails, and feet—and frantically pace and circle endlessly. Zoologists at Oxford University who studied captive minks found that despite generations of being bred for fur, minks have not been domesticated and suffer greatly in captivity, especially if they are not given the opportunity to swim. Foxes, raccoons, and other animals suffer just as much and have been found to cannibalize their cagemates in response to their crowded confinement. -- PETA