I'm originally from cali but being military I'm living in Rhode Island. California is very specific as to what is and is not illegal in that state. Ferrets, Quaker parakeets, Gerbils (the list could go on for days) are all illegal but perfectly legal in other states. Its quite possible no significant research has been done on it by the state and thats the only reason. Although unlikely but if you get some and the state finds out the fine could be huge if it is banned by the state.