Unless kept on a live feed basis most domestic ferrets have lost the urge to hunt for food. If released would not survive for too long without someone either feeding them or forging for food. Ferrets only know their food by what they have been fed while growing up, so a ferret kept on dry kibble will only recognize that as a food source. And believe me trying to get them to eat other foods once on that regime is hard to break. One of my ferrets won't even eat a treat just because he doesn't recognize it as a food source. But destructive they can be if they get lose in your house, ex: clawing walls/carpets/furniture. That's why mine or only allowed in one room and are usually under strict supervision.
