I don't know how accessible this idea is for other ferret owners, but I talked to my vet about what is called The PetNet. They implant a computer chip just underneath the skin of your pet and this chip identifies your pet's name, its address and phone # etc as well as any health problems (ex. diabetic). My vet said that though no one had inquired to him about their ferret getting one of these chips, that it would be a good idea and should be no problem at all. I now live in an apartment and the boys are in a cage when they're not being supervised and there's not really a need for it, but I *definitely* plan on having this procedure done when I move into a house (hopefully in about 2 or 3 years!!). Just an idea that you may want to look into for your buddies! [Posted in FML issue 0633]