Micro chips are provided by Destron Fearing. Here is their website http://www.destronfearing.com/ Expeceted lifetime of their chip is about 25 to 30 years or more. These chips were used in a FERAL (WILD) ferret study in NZ with good results, and no reliability problems. For all you Americans, they are an American based Company so you can get them relatively cheaply. Worth looking at their Website if you have Questions the vet is not sure on. According to the NZ study no chips failed after implanting and it does not damage the ferrets. Microchipping is a very good idea if you want proof of who your ferret is, or belongs to if it escapes. No I am not connected with Destron Fearing. Richard Ardern + 5 fuzzies [Posted in FML issue 3489]