It depends on your state/city/county individual regulations. The easiest way to find out is to google the Wildlife Conservation for you state, and call the Game Warden for your region. They are the...
Check your local laws, you may need a license for a ferret EDIT: Most states do not require an exotic animal license to own a ferret, but check your local fish and game department just to be sure.
Technically an exotic is an animal kept as a pet that is not native to the country you live in. It is also an animal that most would consider a wild animal.
Most states and cities in the United States forbid the ownership of foxes and other native fur bearing animals. In Texas, they can not be held as pets because they are potential vectors for rabies....